diff tests/test-tags.t @ 25402:0c2ded041d10

exchange: support transferring .hgtags fnodes mapping

On Mozilla's mozilla-beta repository .hgtags fnodes resolution takes
~18s from a clean cache on my machine. This means that the first time
a user runs `hg tags`, `hg log`, or any other command that displays or
accesses tags data, a ~18s pause will occur. There is no output during
this pause. This results in a poor user experience and perception
that Mercurial is slow.

The .hgtags changeset to filenode mapping is deterministic. This
patch takes advantage of that property by implementing support
for transferring .hgtags filenodes mappings in a dedicated bundle2
part. When a client advertising support for the "hgtagsfnodes"
capability requests a bundle, a mapping of changesets to .hgtags
filenodes will be sent to the client.

Only mappings of head changesets included in the bundle will be sent. The
transfer of this mapping effectively eliminates one time tags cache related
pauses after initial clone.

The mappings are sent as binary data. So, 40 bytes per pair of
SHA-1s. On the aforementioned mozilla-beta repository,
659 * 40 = 26,360 raw bytes of mappings are sent over the wire
(in addition to the bundle part headers). Assuming 18s to populate
the cache, we only need to transfer this extra data faster than
1.5 KB/s for overall clone + tags cache population time to be shorter.
Put into perspective, the mozilla-beta repository is ~1 GB in size.
So, this additional data constitutes <0.01% of the cloned data.
The marginal overhead for a multi-second performance win on clones
in my opinion justifies an on-by-default behavior.

--- a/tests/test-tags.t	Mon Jun 01 20:23:22 2015 -0700
+++ b/tests/test-tags.t	Mon May 25 17:14:11 2015 -0700
@@ -625,3 +625,77 @@
   globaltag                          0:bbd179dfa0a7
 
   $ cd ..
+
+Create a repository with tags data to test .hgtags fnodes transfer
+
+  $ hg init tagsserver
+  $ cd tagsserver
+  $ cat > .hg/hgrc << EOF
+  > [experimental]
+  > bundle2-exp=True
+  > EOF
+  $ touch foo
+  $ hg -q commit -A -m initial
+  $ hg tag -m 'tag 0.1' 0.1
+  $ echo second > foo
+  $ hg commit -m second
+  $ hg tag -m 'tag 0.2' 0.2
+  $ hg tags
+  tip                                3:40f0358cb314
+  0.2                                2:f63cc8fe54e4
+  0.1                                0:96ee1d7354c4
+  $ cd ..
+
+Cloning should pull down hgtags fnodes mappings and write the cache file
+
+  $ hg --config experimental.bundle2-exp=True clone --pull tagsserver tagsclient
+  requesting all changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 4 changesets with 4 changes to 2 files
+  updating to branch default
+  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+Missing tags2* files means the cache wasn't written through the normal mechanism.
+
+  $ ls tagsclient/.hg/cache
+  branch2-served
+  hgtagsfnodes1
+  rbc-names-v1
+  rbc-revs-v1
+
+Cache should contain the head only, even though other nodes have tags data
+
+  $ f --size --hexdump tagsclient/.hg/cache/hgtagsfnodes1
+  tagsclient/.hg/cache/hgtagsfnodes1: size=96
+  0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
+  0010: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
+  0020: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
+  0030: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
+  0040: ff ff ff ff ff ff ff ff 40 f0 35 8c 19 e0 a7 d3 |........@.5.....|
+  0050: 8a 5c 6a 82 4d cf fb a5 87 d0 2f a3 1e 4f 2f 8a |.\j.M...../..O/.|
+
+Running hg tags should produce tags2* file and not change cache
+
+  $ hg -R tagsclient tags
+  tip                                3:40f0358cb314
+  0.2                                2:f63cc8fe54e4
+  0.1                                0:96ee1d7354c4
+
+  $ ls tagsclient/.hg/cache
+  branch2-served
+  hgtagsfnodes1
+  rbc-names-v1
+  rbc-revs-v1
+  tags2-visible
+
+  $ f --size --hexdump tagsclient/.hg/cache/hgtagsfnodes1
+  tagsclient/.hg/cache/hgtagsfnodes1: size=96
+  0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
+  0010: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
+  0020: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
+  0030: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
+  0040: ff ff ff ff ff ff ff ff 40 f0 35 8c 19 e0 a7 d3 |........@.5.....|
+  0050: 8a 5c 6a 82 4d cf fb a5 87 d0 2f a3 1e 4f 2f 8a |.\j.M...../..O/.|
+