Patchwork [4,of,4] revbranchcache: advertise and use 'rbc' exchange capability

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Submitter Boris Feld
Date Jan. 18, 2018, 3:38 p.m.
Message ID <70277121f723577a5700.1516289927@FB>
Download mbox | patch
Permalink /patch/26907/
State Accepted
Headers show

Comments

Boris Feld - Jan. 18, 2018, 3:38 p.m.
# HG changeset patch
# User Boris Feld <boris.feld@octobus.net>
# Date 1516284622 -3600
#      Thu Jan 18 15:10:22 2018 +0100
# Node ID 70277121f723577a57008607ef0536d23af8df2d
# Parent  544af0806c0556e6281b38214466d5acd623b5f3
# EXP-Topic wire-rbc
# Available At https://bitbucket.org/octobus/mercurial-devel/
#              hg pull https://bitbucket.org/octobus/mercurial-devel/ -r 70277121f723
revbranchcache: advertise and use 'rbc' exchange capability

The feature is now advertised and use.

Updating the branchmap cache can be very expensive (up to minutes on large
repository) and fetching revision branch data is about 80% of that. Exchanging
the rev branch cache over the wire really help to recover from branch map
invalidation.

(There is a good chance other in flight chance would conflict on
test-http-bad-server.t and other. So here is a small note to help update that
test again: capabilities=19bytes, part-107bytes)
Yuya Nishihara - Jan. 19, 2018, 3 p.m.
On Thu, 18 Jan 2018 16:38:47 +0100, Boris Feld wrote:
> # HG changeset patch
> # User Boris Feld <boris.feld@octobus.net>
> # Date 1516284622 -3600
> #      Thu Jan 18 15:10:22 2018 +0100
> # Node ID 70277121f723577a57008607ef0536d23af8df2d
> # Parent  544af0806c0556e6281b38214466d5acd623b5f3
> # EXP-Topic wire-rbc
> # Available At https://bitbucket.org/octobus/mercurial-devel/
> #              hg pull https://bitbucket.org/octobus/mercurial-devel/ -r 70277121f723
> revbranchcache: advertise and use 'rbc' exchange capability
> 
> The feature is now advertised and use.
> 
> Updating the branchmap cache can be very expensive (up to minutes on large
> repository) and fetching revision branch data is about 80% of that. Exchanging
> the rev branch cache over the wire really help to recover from branch map
> invalidation.

Correct me if I get it wrong. This is fast mainly because we no longer need
to uncompress changelog data to retrieve branch names.

It would be nice if some benchmark result were included in the commit message.

Patch

diff --git a/mercurial/bundle2.py b/mercurial/bundle2.py
--- a/mercurial/bundle2.py
+++ b/mercurial/bundle2.py
@@ -1485,6 +1485,7 @@  capabilities = {'HG20': (),
                 'digests': tuple(sorted(util.DIGESTS.keys())),
                 'remote-changegroup': ('http', 'https'),
                 'hgtagsfnodes': (),
+                'rev-branch-cache': (),
                 'phases': ('heads',),
                }
 
diff --git a/tests/common-pattern.py b/tests/common-pattern.py
--- a/tests/common-pattern.py
+++ b/tests/common-pattern.py
@@ -18,7 +18,8 @@  substitutions = [
      br'listkeys%250A'
      br'phases%253Dheads%250A'
      br'pushkey%250A'
-     br'remote-changegroup%253Dhttp%252Chttps',
+     br'remote-changegroup%253Dhttp%252Chttps%250A'
+     br'rev-branch-cache',
      # (the replacement patterns)
      br'$USUAL_BUNDLE_CAPS$'
     ),
@@ -32,7 +33,8 @@  substitutions = [
      br'listkeys%0A'
      br'phases%3Dheads%0A'
      br'pushkey%0A'
-     br'remote-changegroup%3Dhttp%2Chttps',
+     br'remote-changegroup%3Dhttp%2Chttps%0A'
+     br'rev-branch-cache',
      # (replacement patterns)
      br'$USUAL_BUNDLE2_CAPS$'
     ),
diff --git a/tests/test-acl.t b/tests/test-acl.t
--- a/tests/test-acl.t
+++ b/tests/test-acl.t
@@ -93,14 +93,14 @@  Extension disabled for lack of a hook
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -156,14 +156,14 @@  Extension disabled for lack of acl.sourc
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -222,14 +222,14 @@  No [acl.allow]/[acl.deny]
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -298,14 +298,14 @@  Empty [acl.allow]
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -366,14 +366,14 @@  fred is allowed inside foo/
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -439,14 +439,14 @@  Empty [acl.deny]
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -509,14 +509,14 @@  fred is allowed inside foo/, but not foo
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -584,14 +584,14 @@  fred is allowed inside foo/, but not foo
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -656,14 +656,14 @@  fred is allowed inside foo/, but not foo
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -730,14 +730,14 @@  barney is allowed everywhere
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -813,14 +813,14 @@  wilma can change files with a .txt exten
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -894,14 +894,14 @@  file specified by acl.config does not ex
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -970,14 +970,14 @@  betty is allowed inside foo/ by a acl.co
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -1057,14 +1057,14 @@  acl.config can set only [acl.allow]/[acl
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -1143,14 +1143,14 @@  fred is always allowed
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -1225,14 +1225,14 @@  no one is allowed inside foo/Bar/
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -1304,14 +1304,14 @@  OS-level groups
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -1387,14 +1387,14 @@  OS-level groups
   f9cafe1212c8c6fa1120d14a556e18cc44ff8bdd
   911600dab2ae7a9baff75958b84fe606851ce955
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 24 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 24 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 24
   bundle2-input-part: "check:heads" supported
@@ -1507,14 +1507,14 @@  No branch acls specified
   911600dab2ae7a9baff75958b84fe606851ce955
   e8fc755d4d8217ee5b0c2bb41558c40d43b92c01
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 48 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 48 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 48
   bundle2-input-part: "check:heads" supported
@@ -1591,14 +1591,14 @@  Branch acl deny test
   911600dab2ae7a9baff75958b84fe606851ce955
   e8fc755d4d8217ee5b0c2bb41558c40d43b92c01
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 48 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 48 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 48
   bundle2-input-part: "check:heads" supported
@@ -1668,14 +1668,14 @@  Branch acl empty allow test
   911600dab2ae7a9baff75958b84fe606851ce955
   e8fc755d4d8217ee5b0c2bb41558c40d43b92c01
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 48 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 48 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 48
   bundle2-input-part: "check:heads" supported
@@ -1741,14 +1741,14 @@  Branch acl allow other
   911600dab2ae7a9baff75958b84fe606851ce955
   e8fc755d4d8217ee5b0c2bb41558c40d43b92c01
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 48 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 48 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 48
   bundle2-input-part: "check:heads" supported
@@ -1808,14 +1808,14 @@  Branch acl allow other
   911600dab2ae7a9baff75958b84fe606851ce955
   e8fc755d4d8217ee5b0c2bb41558c40d43b92c01
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 48 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 48 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 48
   bundle2-input-part: "check:heads" supported
@@ -1897,14 +1897,14 @@  push foobar into the remote
   911600dab2ae7a9baff75958b84fe606851ce955
   e8fc755d4d8217ee5b0c2bb41558c40d43b92c01
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 48 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 48 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 48
   bundle2-input-part: "check:heads" supported
@@ -1985,14 +1985,14 @@  Branch acl conflicting deny
   911600dab2ae7a9baff75958b84fe606851ce955
   e8fc755d4d8217ee5b0c2bb41558c40d43b92c01
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 48 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 48 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 48
   bundle2-input-part: "check:heads" supported
@@ -2057,14 +2057,14 @@  User 'astro' must not be denied
   911600dab2ae7a9baff75958b84fe606851ce955
   e8fc755d4d8217ee5b0c2bb41558c40d43b92c01
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 48 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 48 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 48
   bundle2-input-part: "check:heads" supported
@@ -2139,14 +2139,14 @@  Non-astro users must be denied
   911600dab2ae7a9baff75958b84fe606851ce955
   e8fc755d4d8217ee5b0c2bb41558c40d43b92c01
   bundle2-output-bundle: "HG20", 5 parts total
-  bundle2-output-part: "replycaps" 178 bytes payload
+  bundle2-output-part: "replycaps" 195 bytes payload
   bundle2-output-part: "check:phases" 48 bytes payload
   bundle2-output-part: "check:heads" streamed payload
   bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
   bundle2-output-part: "phase-heads" 48 bytes payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "replycaps" supported
-  bundle2-input-part: total payload size 178
+  bundle2-input-part: total payload size 195
   bundle2-input-part: "check:phases" supported
   bundle2-input-part: total payload size 48
   bundle2-input-part: "check:heads" supported
diff --git a/tests/test-bookmarks-pushpull.t b/tests/test-bookmarks-pushpull.t
--- a/tests/test-bookmarks-pushpull.t
+++ b/tests/test-bookmarks-pushpull.t
@@ -129,10 +129,10 @@  delete a remote bookmark
   bundle2-output: bundle parameter: 
   bundle2-output: start of parts
   bundle2-output: bundle part: "replycaps"
-  bundle2-output-part: "replycaps" 195 bytes payload
+  bundle2-output-part: "replycaps" 212 bytes payload
   bundle2-output: part 0: "REPLYCAPS"
   bundle2-output: header chunk size: 16
-  bundle2-output: payload chunk size: 195
+  bundle2-output: payload chunk size: 212
   bundle2-output: closing payload chunk
   bundle2-output: bundle part: "check:bookmarks"
   bundle2-output-part: "check:bookmarks" 23 bytes payload
@@ -162,9 +162,9 @@  delete a remote bookmark
   bundle2-input: part parameters: 0
   bundle2-input: found a handler for part replycaps
   bundle2-input-part: "replycaps" supported
-  bundle2-input: payload chunk size: 195
+  bundle2-input: payload chunk size: 212
   bundle2-input: payload chunk size: 0
-  bundle2-input-part: total payload size 195
+  bundle2-input-part: total payload size 212
   bundle2-input: part header size: 22
   bundle2-input: part type: "CHECK:BOOKMARKS"
   bundle2-input: part id: "1"
@@ -241,10 +241,10 @@  delete a remote bookmark
   bundle2-output: bundle parameter: 
   bundle2-output: start of parts
   bundle2-output: bundle part: "replycaps"
-  bundle2-output-part: "replycaps" 195 bytes payload
+  bundle2-output-part: "replycaps" 212 bytes payload
   bundle2-output: part 0: "REPLYCAPS"
   bundle2-output: header chunk size: 16
-  bundle2-output: payload chunk size: 195
+  bundle2-output: payload chunk size: 212
   bundle2-output: closing payload chunk
   bundle2-output: bundle part: "check:bookmarks"
   bundle2-output-part: "check:bookmarks" 23 bytes payload
@@ -275,9 +275,9 @@  delete a remote bookmark
   bundle2-input: part parameters: 0
   bundle2-input: found a handler for part replycaps
   bundle2-input-part: "replycaps" supported
-  bundle2-input: payload chunk size: 195
+  bundle2-input: payload chunk size: 212
   bundle2-input: payload chunk size: 0
-  bundle2-input-part: total payload size 195
+  bundle2-input-part: total payload size 212
   bundle2-input: part header size: 22
   bundle2-input: part type: "CHECK:BOOKMARKS"
   bundle2-input: part id: "1"
diff --git a/tests/test-debugcommands.t b/tests/test-debugcommands.t
--- a/tests/test-debugcommands.t
+++ b/tests/test-debugcommands.t
@@ -347,3 +347,4 @@  Test debugcapabilities command:
     remote-changegroup
       http
       https
+    rev-branch-cache
diff --git a/tests/test-http-bad-server.t b/tests/test-http-bad-server.t
--- a/tests/test-http-bad-server.t
+++ b/tests/test-http-bad-server.t
@@ -118,9 +118,9 @@  Failure on subsequent HTTP request on th
   write(23) -> Server: badhttpserver\r\n
   write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
   write(41) -> Content-Type: application/mercurial-0.1\r\n
-  write(21) -> Content-Length: 417\r\n
+  write(21) -> Content-Length: 436\r\n
   write(2) -> \r\n
-  write(417) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  write(436) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
   readline(4? from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n (glob)
   readline(1? from -1) -> (1?) Accept-Encoding* (glob)
   read limit reached; closing socket
@@ -159,9 +159,9 @@  Failure to read getbundle HTTP request
   write(23) -> Server: badhttpserver\r\n
   write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
   write(41) -> Content-Type: application/mercurial-0.1\r\n
-  write(21) -> Content-Length: 417\r\n
+  write(21) -> Content-Length: 436\r\n
   write(2) -> \r\n
-  write(417) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  write(436) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
   readline(13? from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n (glob)
   readline(1?? from -1) -> (27) Accept-Encoding: identity\r\n (glob)
   readline(8? from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n (glob)
@@ -216,9 +216,9 @@  Now do a variation using POST to send ar
   write(23) -> Server: badhttpserver\r\n
   write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
   write(41) -> Content-Type: application/mercurial-0.1\r\n
-  write(21) -> Content-Length: 430\r\n
+  write(21) -> Content-Length: 449\r\n
   write(2) -> \r\n
-  write(430) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httppostargs httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  write(449) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httppostargs httpmediatype=0.1rx,0.1tx,0.2tx compression=none
   readline\(14[67] from 65537\) -> \(2[67]\) POST /\?cmd=batch HTTP/1.1\\r\\n (re)
   readline\(1(19|20) from -1\) -> \(27\) Accept-Encoding: identity\\r\\n (re)
   readline(9? from -1) -> (41) content-type: application/mercurial-0.1\r\n (glob)
@@ -275,7 +275,7 @@  Server sends an incomplete capabilities 
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
-  abort: HTTP request error (incomplete response; expected 397 bytes got 20)
+  abort: HTTP request error (incomplete response; expected 416 bytes got 20)
   (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
   [255]
 
@@ -292,16 +292,16 @@  Server sends an incomplete capabilities 
   write(23 from 23) -> (121) Server: badhttpserver\r\n
   write(37 from 37) -> (84) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
   write(41 from 41) -> (43) Content-Type: application/mercurial-0.1\r\n
-  write(21 from 21) -> (22) Content-Length: 417\r\n
+  write(21 from 21) -> (22) Content-Length: 436\r\n
   write(2 from 2) -> (20) \r\n
-  write(20 from 417) -> (0) lookup changegroupsu
+  write(20 from 436) -> (0) lookup changegroupsu
   write limit reached; closing socket
 
   $ rm -f error.log
 
 Server sends incomplete headers for batch request
 
-  $ hg serve --config badserver.closeaftersendbytes=695 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=714 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
 TODO this output is horrible
@@ -323,13 +323,13 @@  TODO this output is horrible
   readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
   readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
   readline(-1) -> (2) \r\n
-  write(36 from 36) -> (659) HTTP/1.1 200 Script output follows\r\n
-  write(23 from 23) -> (636) Server: badhttpserver\r\n
-  write(37 from 37) -> (599) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
-  write(41 from 41) -> (558) Content-Type: application/mercurial-0.1\r\n
-  write(21 from 21) -> (537) Content-Length: 417\r\n
-  write(2 from 2) -> (535) \r\n
-  write(417 from 417) -> (118) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  write(36 from 36) -> (678) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (655) Server: badhttpserver\r\n
+  write(37 from 37) -> (618) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (577) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (556) Content-Length: 436\r\n
+  write(2 from 2) -> (554) \r\n
+  write(436 from 436) -> (118) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
   readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
   readline(-1) -> (27) Accept-Encoding: identity\r\n
   readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
@@ -350,7 +350,7 @@  TODO this output is horrible
 
 Server sends an incomplete HTTP response body to batch request
 
-  $ hg serve --config badserver.closeaftersendbytes=760 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=779 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
 TODO client spews a stack due to uncaught ValueError in batch.results()
@@ -371,13 +371,13 @@  TODO client spews a stack due to uncaugh
   readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
   readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
   readline(-1) -> (2) \r\n
-  write(36 from 36) -> (724) HTTP/1.1 200 Script output follows\r\n
-  write(23 from 23) -> (701) Server: badhttpserver\r\n
-  write(37 from 37) -> (664) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
-  write(41 from 41) -> (623) Content-Type: application/mercurial-0.1\r\n
-  write(21 from 21) -> (602) Content-Length: 417\r\n
-  write(2 from 2) -> (600) \r\n
-  write(417 from 417) -> (183) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  write(36 from 36) -> (743) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (720) Server: badhttpserver\r\n
+  write(37 from 37) -> (683) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (642) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (621) Content-Length: 436\r\n
+  write(2 from 2) -> (619) \r\n
+  write(436 from 436) -> (183) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
   readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
   readline(-1) -> (27) Accept-Encoding: identity\r\n
   readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
@@ -400,7 +400,7 @@  TODO client spews a stack due to uncaugh
 
 Server sends incomplete headers for getbundle response
 
-  $ hg serve --config badserver.closeaftersendbytes=907 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=926 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
 TODO this output is terrible
@@ -423,13 +423,13 @@  TODO this output is terrible
   readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
   readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
   readline(-1) -> (2) \r\n
-  write(36 from 36) -> (871) HTTP/1.1 200 Script output follows\r\n
-  write(23 from 23) -> (848) Server: badhttpserver\r\n
-  write(37 from 37) -> (811) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
-  write(41 from 41) -> (770) Content-Type: application/mercurial-0.1\r\n
-  write(21 from 21) -> (749) Content-Length: 417\r\n
-  write(2 from 2) -> (747) \r\n
-  write(417 from 417) -> (330) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  write(36 from 36) -> (890) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (867) Server: badhttpserver\r\n
+  write(37 from 37) -> (830) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (789) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (768) Content-Length: 436\r\n
+  write(2 from 2) -> (766) \r\n
+  write(436 from 436) -> (330) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
   readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
   readline(-1) -> (27) Accept-Encoding: identity\r\n
   readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
@@ -449,7 +449,7 @@  TODO this output is terrible
   readline(65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
   readline(-1) -> (27) Accept-Encoding: identity\r\n
   readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
-  readline(-1) -> (422) x-hgarg-1: bookmarks=1&bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
+  readline(-1) -> (443) x-hgarg-1: bookmarks=1&bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps%250Arev-branch-cache&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
   readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
   readline(-1) -> (35) accept: application/mercurial-0.1\r\n
   readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
@@ -466,7 +466,7 @@  TODO this output is terrible
 
 Server sends empty HTTP body for getbundle
 
-  $ hg serve --config badserver.closeaftersendbytes=945 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=964 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -484,13 +484,13 @@  Server sends empty HTTP body for getbund
   readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
   readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
   readline(-1) -> (2) \r\n
-  write(36 from 36) -> (909) HTTP/1.1 200 Script output follows\r\n
-  write(23 from 23) -> (886) Server: badhttpserver\r\n
-  write(37 from 37) -> (849) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
-  write(41 from 41) -> (808) Content-Type: application/mercurial-0.1\r\n
-  write(21 from 21) -> (787) Content-Length: 417\r\n
-  write(2 from 2) -> (785) \r\n
-  write(417 from 417) -> (368) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  write(36 from 36) -> (928) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (905) Server: badhttpserver\r\n
+  write(37 from 37) -> (868) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (827) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (806) Content-Length: 436\r\n
+  write(2 from 2) -> (804) \r\n
+  write(436 from 436) -> (368) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
   readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
   readline(-1) -> (27) Accept-Encoding: identity\r\n
   readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
@@ -510,7 +510,7 @@  Server sends empty HTTP body for getbund
   readline(65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
   readline(-1) -> (27) Accept-Encoding: identity\r\n
   readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
-  readline(-1) -> (422) x-hgarg-1: bookmarks=1&bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
+  readline(-1) -> (443) x-hgarg-1: bookmarks=1&bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps%250Arev-branch-cache&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
   readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
   readline(-1) -> (35) accept: application/mercurial-0.1\r\n
   readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
@@ -529,7 +529,7 @@  Server sends empty HTTP body for getbund
 
 Server sends partial compression string
 
-  $ hg serve --config badserver.closeaftersendbytes=969 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=988 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -547,13 +547,13 @@  Server sends partial compression string
   readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
   readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
   readline(-1) -> (2) \r\n
-  write(36 from 36) -> (933) HTTP/1.1 200 Script output follows\r\n
-  write(23 from 23) -> (910) Server: badhttpserver\r\n
-  write(37 from 37) -> (873) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
-  write(41 from 41) -> (832) Content-Type: application/mercurial-0.1\r\n
-  write(21 from 21) -> (811) Content-Length: 417\r\n
-  write(2 from 2) -> (809) \r\n
-  write(417 from 417) -> (392) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  write(36 from 36) -> (952) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (929) Server: badhttpserver\r\n
+  write(37 from 37) -> (892) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (851) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (830) Content-Length: 436\r\n
+  write(2 from 2) -> (828) \r\n
+  write(436 from 436) -> (392) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
   readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
   readline(-1) -> (27) Accept-Encoding: identity\r\n
   readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
@@ -573,7 +573,7 @@  Server sends partial compression string
   readline(65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
   readline(-1) -> (27) Accept-Encoding: identity\r\n
   readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
-  readline(-1) -> (422) x-hgarg-1: bookmarks=1&bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
+  readline(-1) -> (443) x-hgarg-1: bookmarks=1&bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps%250Arev-branch-cache&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
   readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
   readline(-1) -> (35) accept: application/mercurial-0.1\r\n
   readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
@@ -595,7 +595,7 @@  Server sends partial compression string
 
 Server sends partial bundle2 header magic
 
-  $ hg serve --config badserver.closeaftersendbytes=966 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=985 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -619,7 +619,7 @@  Server sends partial bundle2 header magi
 
 Server sends incomplete bundle2 stream params length
 
-  $ hg serve --config badserver.closeaftersendbytes=975 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=994 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -644,7 +644,7 @@  Server sends incomplete bundle2 stream p
 
 Servers stops after bundle2 stream params header
 
-  $ hg serve --config badserver.closeaftersendbytes=978 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=997 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -669,7 +669,7 @@  Servers stops after bundle2 stream param
 
 Server stops sending after bundle2 part header length
 
-  $ hg serve --config badserver.closeaftersendbytes=987 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=1006 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -695,7 +695,7 @@  Server stops sending after bundle2 part 
 
 Server stops sending after bundle2 part header
 
-  $ hg serve --config badserver.closeaftersendbytes=1034 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=1053 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -725,7 +725,7 @@  Server stops sending after bundle2 part 
 
 Server stops after bundle2 part payload chunk size
 
-  $ hg serve --config badserver.closeaftersendbytes=1055 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=1074 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -756,7 +756,7 @@  Server stops after bundle2 part payload 
 
 Server stops sending in middle of bundle2 payload chunk
 
-  $ hg serve --config badserver.closeaftersendbytes=1516 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=1535 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -788,7 +788,7 @@  Server stops sending in middle of bundle
 
 Server stops sending after 0 length payload chunk size
 
-  $ hg serve --config badserver.closeaftersendbytes=1547 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=1566 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -825,7 +825,8 @@  Server stops sending after 0 length payl
 Server stops sending after 0 part bundle part header (indicating end of bundle2 payload)
 This is before the 0 size chunked transfer part that signals end of HTTP response.
 
-  $ hg serve --config badserver.closeaftersendbytes=1722 -p $HGPORT -d --pid-file=hg.pid -E error.log
+#  $ hg serve --config badserver.closeaftersendbytes=1741 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=1848 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -841,24 +842,24 @@  This is before the 0 size chunked transf
   $ killdaemons.py $DAEMON_PIDS
 
   $ tail -22 error.log
-  write(28 from 28) -> (779) Transfer-Encoding: chunked\r\n
-  write(2 from 2) -> (777) \r\n
-  write(6 from 6) -> (771) 1\\r\\n\x04\\r\\n (esc)
-  write(9 from 9) -> (762) 4\r\nnone\r\n
-  write(9 from 9) -> (753) 4\r\nHG20\r\n
-  write(9 from 9) -> (744) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
-  write(9 from 9) -> (735) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
-  write(47 from 47) -> (688) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
-  write(9 from 9) -> (679) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
-  write(473 from 473) -> (206) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
-  write(9 from 9) -> (197) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
-  write(9 from 9) -> (188) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
-  write(38 from 38) -> (150) 20\\r\\n\x08LISTKEYS\x00\x00\x00\x01\x01\x00	\x06namespacephases\\r\\n (esc)
-  write(9 from 9) -> (141) 4\\r\\n\x00\x00\x00:\\r\\n (esc)
-  write(64 from 64) -> (77) 3a\r\n96ee1d7354c4ad7372047672c36a1f561e3a6a4c	1\npublishing	True\r\n
-  write(9 from 9) -> (68) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
-  write(9 from 9) -> (59) 4\\r\\n\x00\x00\x00#\\r\\n (esc)
-  write(41 from 41) -> (18) 23\\r\\n\x08LISTKEYS\x00\x00\x00\x02\x01\x00		namespacebookmarks\\r\\n (esc)
+  write(9 from 9) -> (851) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (842) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
+  write(47 from 47) -> (795) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
+  write(9 from 9) -> (786) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
+  write(473 from 473) -> (313) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (304) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (295) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
+  write(38 from 38) -> (257) 20\\r\\n\x08LISTKEYS\x00\x00\x00\x01\x01\x00	\x06namespacephases\\r\\n (esc)
+  write(9 from 9) -> (248) 4\\r\\n\x00\x00\x00:\\r\\n (esc)
+  write(64 from 64) -> (184) 3a\r\n96ee1d7354c4ad7372047672c36a1f561e3a6a4c	1\npublishing	True\r\n
+  write(9 from 9) -> (175) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (166) 4\\r\\n\x00\x00\x00#\\r\\n (esc)
+  write(41 from 41) -> (125) 23\\r\\n\x08LISTKEYS\x00\x00\x00\x02\x01\x00		namespacebookmarks\\r\\n (esc)
+  write(9 from 9) -> (116) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (107) 4\\r\\n\x00\x00\x00\x1d\\r\\n (esc)
+  write(35 from 35) -> (72) 1d\\r\\n\x16CACHE:REV-BRANCH-CACHE\x00\x00\x00\x03\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (63) 4\\r\\n\x00\x00\x00'\\r\\n (esc)
+  write(45 from 45) -> (18) 27\\r\\n\x00\x00\x00\x07\x00\x00\x00\x01\x00\x00\x00\x00default\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\\r\\n (esc)
   write(9 from 9) -> (9) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
   write(9 from 9) -> (0) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
   write limit reached; closing socket
@@ -869,7 +870,7 @@  This is before the 0 size chunked transf
 
 Server sends a size 0 chunked-transfer size without terminating \r\n
 
-  $ hg serve --config badserver.closeaftersendbytes=1725 -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ hg serve --config badserver.closeaftersendbytes=1851 -p $HGPORT -d --pid-file=hg.pid -E error.log
   $ cat hg.pid > $DAEMON_PIDS
 
   $ hg clone http://localhost:$HGPORT/ clone
@@ -885,24 +886,24 @@  Server sends a size 0 chunked-transfer s
   $ killdaemons.py $DAEMON_PIDS
 
   $ tail -23 error.log
-  write(28 from 28) -> (782) Transfer-Encoding: chunked\r\n
-  write(2 from 2) -> (780) \r\n
-  write(6 from 6) -> (774) 1\\r\\n\x04\\r\\n (esc)
-  write(9 from 9) -> (765) 4\r\nnone\r\n
-  write(9 from 9) -> (756) 4\r\nHG20\r\n
-  write(9 from 9) -> (747) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
-  write(9 from 9) -> (738) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
-  write(47 from 47) -> (691) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
-  write(9 from 9) -> (682) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
-  write(473 from 473) -> (209) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
-  write(9 from 9) -> (200) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
-  write(9 from 9) -> (191) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
-  write(38 from 38) -> (153) 20\\r\\n\x08LISTKEYS\x00\x00\x00\x01\x01\x00	\x06namespacephases\\r\\n (esc)
-  write(9 from 9) -> (144) 4\\r\\n\x00\x00\x00:\\r\\n (esc)
-  write(64 from 64) -> (80) 3a\r\n96ee1d7354c4ad7372047672c36a1f561e3a6a4c	1\npublishing	True\r\n
-  write(9 from 9) -> (71) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
-  write(9 from 9) -> (62) 4\\r\\n\x00\x00\x00#\\r\\n (esc)
-  write(41 from 41) -> (21) 23\\r\\n\x08LISTKEYS\x00\x00\x00\x02\x01\x00		namespacebookmarks\\r\\n (esc)
+  write(9 from 9) -> (854) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (845) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
+  write(47 from 47) -> (798) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
+  write(9 from 9) -> (789) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
+  write(473 from 473) -> (316) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (307) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (298) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
+  write(38 from 38) -> (260) 20\\r\\n\x08LISTKEYS\x00\x00\x00\x01\x01\x00	\x06namespacephases\\r\\n (esc)
+  write(9 from 9) -> (251) 4\\r\\n\x00\x00\x00:\\r\\n (esc)
+  write(64 from 64) -> (187) 3a\r\n96ee1d7354c4ad7372047672c36a1f561e3a6a4c	1\npublishing	True\r\n
+  write(9 from 9) -> (178) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (169) 4\\r\\n\x00\x00\x00#\\r\\n (esc)
+  write(41 from 41) -> (128) 23\\r\\n\x08LISTKEYS\x00\x00\x00\x02\x01\x00		namespacebookmarks\\r\\n (esc)
+  write(9 from 9) -> (119) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (110) 4\\r\\n\x00\x00\x00\x1d\\r\\n (esc)
+  write(35 from 35) -> (75) 1d\\r\\n\x16CACHE:REV-BRANCH-CACHE\x00\x00\x00\x03\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (66) 4\\r\\n\x00\x00\x00'\\r\\n (esc)
+  write(45 from 45) -> (21) 27\\r\\n\x00\x00\x00\x07\x00\x00\x00\x01\x00\x00\x00\x00default\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\\r\\n (esc)
   write(9 from 9) -> (12) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
   write(9 from 9) -> (3) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
   write(3 from 5) -> (0) 0\r\n
diff --git a/tests/test-obsolete-changeset-exchange.t b/tests/test-obsolete-changeset-exchange.t
--- a/tests/test-obsolete-changeset-exchange.t
+++ b/tests/test-obsolete-changeset-exchange.t
@@ -152,10 +152,11 @@  client only pulls down 1 changeset
   list of changesets:
   bec0734cd68e84477ba7fc1d13e6cff53ab70129
   listing keys for "bookmarks"
-  bundle2-output-bundle: "HG20", 3 parts total
+  bundle2-output-bundle: "HG20", 4 parts total
   bundle2-output-part: "changegroup" (params: 1 mandatory 1 advisory) streamed payload
   bundle2-output-part: "listkeys" (params: 1 mandatory) empty payload
   bundle2-output-part: "phase-heads" 24 bytes payload
+  bundle2-output-part: "cache:rev-branch-cache" streamed payload
   bundle2-input-bundle: with-transaction
   bundle2-input-part: "changegroup" (params: 1 mandatory 1 advisory) supported
   adding changesets
@@ -168,7 +169,9 @@  client only pulls down 1 changeset
   bundle2-input-part: "listkeys" (params: 1 mandatory) supported
   bundle2-input-part: "phase-heads" supported
   bundle2-input-part: total payload size 24
-  bundle2-input-bundle: 2 parts total
+  bundle2-input-part: "cache:rev-branch-cache" supported
+  bundle2-input-part: total payload size 39
+  bundle2-input-bundle: 3 parts total
   checking for updated bookmarks
   new changesets bec0734cd68e
   updating the branch cache
diff --git a/tests/test-rebase-conflicts.t b/tests/test-rebase-conflicts.t
--- a/tests/test-rebase-conflicts.t
+++ b/tests/test-rebase-conflicts.t
@@ -326,7 +326,9 @@  Check that the right ancestors is used w
   bundle2-input-bundle: 1 parts total
   updating the branch cache
   invalid branchheads cache (served): tip differs
+  history modification detected - truncating revision branch cache to revision 9
   rebase completed
+  truncating cache/rbc-revs-v1 to 72
 
 Test minimization of merge conflicts
   $ hg up -q null
diff --git a/tests/test-ssh-bundle1.t b/tests/test-ssh-bundle1.t
--- a/tests/test-ssh-bundle1.t
+++ b/tests/test-ssh-bundle1.t
@@ -467,7 +467,7 @@  debug output
   running .* ".*/dummyssh" ['"]user@dummy['"] ('|")hg -R remote serve --stdio('|") (re)
   sending hello command
   sending between command
-  remote: 384
+  remote: 403
   remote: capabilities: lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 $USUAL_BUNDLE2_CAPS$ unbundle=HG10GZ,HG10BZ,HG10UN
   remote: 1
   preparing listkeys for "bookmarks"
diff --git a/tests/test-ssh.t b/tests/test-ssh.t
--- a/tests/test-ssh.t
+++ b/tests/test-ssh.t
@@ -483,7 +483,7 @@  debug output
   running .* ".*/dummyssh" ['"]user@dummy['"] ('|")hg -R remote serve --stdio('|") (re)
   sending hello command
   sending between command
-  remote: 384
+  remote: 403
   remote: capabilities: lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 $USUAL_BUNDLE2_CAPS$ unbundle=HG10GZ,HG10BZ,HG10UN
   remote: 1
   query 1; heads
diff --git a/tests/test-static-http.t b/tests/test-static-http.t
--- a/tests/test-static-http.t
+++ b/tests/test-static-http.t
@@ -222,6 +222,8 @@  List of files accessed over HTTP:
   /.hg/bookmarks
   /.hg/bookmarks.current
   /.hg/cache/hgtagsfnodes1
+  /.hg/cache/rbc-names-v1
+  /.hg/cache/rbc-revs-v1
   /.hg/requires
   /.hg/store/00changelog.i
   /.hg/store/00manifest.i
@@ -234,6 +236,8 @@  List of files accessed over HTTP:
   /remote-with-names/.hg/bookmarks.current
   /remote-with-names/.hg/cache/branch2-served
   /remote-with-names/.hg/cache/hgtagsfnodes1
+  /remote-with-names/.hg/cache/rbc-names-v1
+  /remote-with-names/.hg/cache/rbc-revs-v1
   /remote-with-names/.hg/cache/tags2-served
   /remote-with-names/.hg/localtags
   /remote-with-names/.hg/requires
@@ -248,6 +252,7 @@  List of files accessed over HTTP:
   /remote/.hg/cache/branch2-served
   /remote/.hg/cache/hgtagsfnodes1
   /remote/.hg/cache/rbc-names-v1
+  /remote/.hg/cache/rbc-revs-v1
   /remote/.hg/cache/tags2-served
   /remote/.hg/localtags
   /remote/.hg/requires
@@ -265,6 +270,8 @@  List of files accessed over HTTP:
   /sub/.hg/bookmarks
   /sub/.hg/bookmarks.current
   /sub/.hg/cache/hgtagsfnodes1
+  /sub/.hg/cache/rbc-names-v1
+  /sub/.hg/cache/rbc-revs-v1
   /sub/.hg/requires
   /sub/.hg/store/00changelog.i
   /sub/.hg/store/00manifest.i
diff --git a/tests/test-tags.t b/tests/test-tags.t
--- a/tests/test-tags.t
+++ b/tests/test-tags.t
@@ -681,6 +681,8 @@  Missing tags2* files means the cache was
   checklink (symlink !)
   checklink-target (symlink !)
   hgtagsfnodes1
+  rbc-names-v1
+  rbc-revs-v1
 
 Cache should contain the head only, even though other nodes have tags data
 
@@ -706,6 +708,8 @@  Running hg tags should produce tags2* fi
   checklink (symlink !)
   checklink-target (symlink !)
   hgtagsfnodes1
+  rbc-names-v1
+  rbc-revs-v1
   tags2-visible
 
   $ f --size --hexdump tagsclient/.hg/cache/hgtagsfnodes1