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relnote: document the use of persistent-nodemap by default for Rust build...
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1 1 == New Features ==
2 2
3 3 * `hg purge` is now a core command using `--confirm` by default.
4 4
5 5 * The `rev-branch-cache` is now updated incrementally whenever changesets
6 6 are added.
7 7
8 8 * The new options `experimental.bundlecompthreads` and
9 9 `experimental.bundlecompthreads.<engine>` can be used to instruct
10 10 the compression engines for bundle operations to use multiple threads
11 11 for compression. The default is single threaded operation. Currently
12 12 only supported for zstd.
13 13
14 14 == Default Format Change ==
15 15
16 16 These changes affects newly created repositories (or new clone) done with
17 17 Mercurial 5.8.
18 18
19 19 * The `ZSTD` compression will now be used by default for new repositories
20 20 when available. This compression format was introduced in Mercurial 5.0,
21 21 released in May 2019. See `hg help config.format.revlog-compression` for
22 22 details.
23 23
24 * Mercurial installation built with the Rust parts will now use the
25 "persistent nodemap" feature by default. This feature was introduced in
26 Mercurial 5.4 (May 2020). However Mercurial instalation built without the
27 fast Rust implementation will refuse to interract with them by default.
28 This restriction can be lifted through configuration.
29
30 See `hg help config.format.use-persistent-nodemap` for details
31
24 32 == New Experimental Features ==
25 33
26 34 * There's a new `diff.merge` config option to show the changes
27 35 relative to an automerge for merge changesets. This makes it
28 36 easier to detect and review manual changes performed in merge
29 37 changesets. It is supported by `hg diff --change`, `hg log -p`
30 38 `hg incoming -p`, and `hg outgoing -p` so far.
31 39
32 40
33 41 == Bug Fixes ==
34 42
35 43
36 44
37 45 == Backwards Compatibility Changes ==
38 46
39 47 * In normal repositories, the first parent of a changeset is not null,
40 48 unless both parents are null (like the first changeset). Some legacy
41 49 repositories violate this condition. The revlog code will now
42 50 silentely swap the parents if this condition is tested. This can
43 51 change the output of `hg log` when explicitly asking for first or
44 52 second parent. The changesets "nodeid" are not affected.
45 53
46 54
47 55 == Internal API Changes ==
48 56
49 57 * `changelog.branchinfo` is deprecated and will be removed after 5.8.
50 58 It is superseded by `changelogrevision.branchinfo`.
51 59
52 60 * Callbacks for revlog.addgroup and the changelog._nodeduplicatecallback hook
53 61 now get a revision number as argument instead of a node.
54 62
55 63 * revlog.addrevision returns the revision number instead of the node.
56 64
57 65 * `nodes.nullid` and related constants are being phased out as part of
58 66 the deprecation of SHA1. Repository instances and related classes
59 67 provide access via `nodeconstants` and in some cases `nullid` attributes.
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