tests/test-persistent-nodemap.t

nodemap: also use persistent nodemap for manifest

The manifest as a different usage pattern than the changelog. First, while the
lookup in changelog are not garanteed to match, the lookup in the manifest
nodemap come from changelog and will exist in the manifest. In addition, looking
up a manifest almost always result in unpacking a manifest an operation that
rarely come cheap.

Nevertheless, using a persistent nodemap provide a significant gain for some
operations.


For our measurementw, we use `hg cat --rev REV FILE` on the our reference
mozilla-try. On this repository the persistent nodemap cache is about 29 MB in
side for a total store side of 11,988 MB

File with large history (file: b2g/config/gaia.json, revision: 195a1146daa0)

    no optimisation:                             0.358s
    using mmap for index:                        0.297s (-0.061s)
    persistent nodemap for changelog only:       0.275s (-0.024s)
    persistent nodemap for manifest too:         0.258s (-0.017s)

File with small history (file: .hgignore, revision: 195a1146daa0)

    no optimisation:                             0.377s
    using mmap for index:                        0.296s (-0.061s)
    persistent nodemap for changelog only:       0.274s (-0.022s)
    persistent nodemap for manifest too:         0.257s (-0.017s)

Same file but using a revision (8ba995b74e18) with a smaller manifest (3944829
bytes vs  10 bytes)

    no optimisation:                             0.192s (-0.185s)
    using mmap for index:                        0.131s (-0.061s)
    persistent nodemap for changelog only:       0.106s (-0.025s)
    persistent nodemap for manifest too:         0.087s (-0.019s)

Differential Revision: https://phab.mercurial-scm.org/D8410

===================================
Test the persistent on-disk nodemap
===================================

  $ hg init test-repo
  $ cd test-repo
  $ cat << EOF >> .hg/hgrc
  > [experimental]
  > exp-persistent-nodemap=yes
  > [devel]
  > persistent-nodemap=yes
  > EOF
  $ hg debugbuilddag .+5000 --new-file
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5000
  tip-node: 6b02b8c7b96654c25e86ba69eda198d7e6ad8b3c
  data-length: 121088
  data-unused: 0
  data-unused: 0.000%
  $ f --size .hg/store/00changelog.n
  .hg/store/00changelog.n: size=70

Simple lookup works

  $ ANYNODE=`hg log --template '{node|short}\n' --rev tip`
  $ hg log -r "$ANYNODE" --template '{rev}\n'
  5000


#if rust

  $ f --sha256 .hg/store/00changelog-*.nd
  .hg/store/00changelog-????????????????.nd: sha256=2e029d3200bd1a986b32784fc2ef1a3bd60dc331f025718bcf5ff44d93f026fd (glob)

  $ f --sha256 .hg/store/00manifest-*.nd
  .hg/store/00manifest-????????????????.nd: sha256=97117b1c064ea2f86664a124589e47db0e254e8d34739b5c5cc5bf31c9da2b51 (glob)
  $ hg debugnodemap --dump-new | f --sha256 --size
  size=121088, sha256=2e029d3200bd1a986b32784fc2ef1a3bd60dc331f025718bcf5ff44d93f026fd
  $ hg debugnodemap --dump-disk | f --sha256 --bytes=256 --hexdump --size
  size=121088, sha256=2e029d3200bd1a986b32784fc2ef1a3bd60dc331f025718bcf5ff44d93f026fd
  0000: 00 00 00 91 00 00 00 20 00 00 00 bb 00 00 00 e7 |....... ........|
  0010: 00 00 00 66 00 00 00 a1 00 00 01 13 00 00 01 22 |...f..........."|
  0020: 00 00 00 23 00 00 00 fc 00 00 00 ba 00 00 00 5e |...#...........^|
  0030: 00 00 00 df 00 00 01 4e 00 00 01 65 00 00 00 ab |.......N...e....|
  0040: 00 00 00 a9 00 00 00 95 00 00 00 73 00 00 00 38 |...........s...8|
  0050: 00 00 00 cc 00 00 00 92 00 00 00 90 00 00 00 69 |...............i|
  0060: 00 00 00 ec 00 00 00 8d 00 00 01 4f 00 00 00 12 |...........O....|
  0070: 00 00 02 0c 00 00 00 77 00 00 00 9c 00 00 00 8f |.......w........|
  0080: 00 00 00 d5 00 00 00 6b 00 00 00 48 00 00 00 b3 |.......k...H....|
  0090: 00 00 00 e5 00 00 00 b5 00 00 00 8e 00 00 00 ad |................|
  00a0: 00 00 00 7b 00 00 00 7c 00 00 00 0b 00 00 00 2b |...{...|.......+|
  00b0: 00 00 00 c6 00 00 00 1e 00 00 01 08 00 00 00 11 |................|
  00c0: 00 00 01 30 00 00 00 26 00 00 01 9c 00 00 00 35 |...0...&.......5|
  00d0: 00 00 00 b8 00 00 01 31 00 00 00 2c 00 00 00 55 |.......1...,...U|
  00e0: 00 00 00 8a 00 00 00 9a 00 00 00 0c 00 00 01 1e |................|
  00f0: 00 00 00 a4 00 00 00 83 00 00 00 c9 00 00 00 8c |................|


#else

  $ f --sha256 .hg/store/00changelog-*.nd
  .hg/store/00changelog-????????????????.nd: sha256=f544f5462ff46097432caf6d764091f6d8c46d6121be315ead8576d548c9dd79 (glob)
  $ hg debugnodemap --dump-new | f --sha256 --size
  size=121088, sha256=f544f5462ff46097432caf6d764091f6d8c46d6121be315ead8576d548c9dd79
  $ hg debugnodemap --dump-disk | f --sha256 --bytes=256 --hexdump --size
  size=121088, sha256=f544f5462ff46097432caf6d764091f6d8c46d6121be315ead8576d548c9dd79
  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 f5 06 ff ff ff ff ff ff f3 e7 |................|
  0030: ff ff ef ca ff ff ff ff ff ff ff ff ff ff ff ff |................|
  0040: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
  0050: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ed 08 |................|
  0060: ff ff ed 66 ff ff ff ff ff ff ff ff ff ff ff ff |...f............|
  0070: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
  0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
  0090: ff ff ff ff ff ff ff ff ff ff ff ff ff ff f6 ed |................|
  00a0: ff ff ff ff ff ff fe 61 ff ff ff ff ff ff ff ff |.......a........|
  00b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
  00c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
  00d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|
  00e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff f1 02 |................|
  00f0: ff ff ff ff ff ff ed 1b ff ff ff ff ff ff ff ff |................|

#endif

  $ hg debugnodemap --check
  revision in index:   5001
  revision in nodemap: 5001

add a new commit

  $ hg up
  5001 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo foo > foo
  $ hg add foo
  $ hg ci -m 'foo'

#if no-pure no-rust
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5001
  tip-node: 16395c3cf7e231394735e6b1717823ada303fb0c
  data-length: 121088
  data-unused: 0
  data-unused: 0.000%
#else
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5001
  tip-node: 16395c3cf7e231394735e6b1717823ada303fb0c
  data-length: 121344
  data-unused: 256
  data-unused: 0.211%
#endif

  $ f --size .hg/store/00changelog.n
  .hg/store/00changelog.n: size=70

(The pure code use the debug code that perform incremental update, the C code reencode from scratch)

#if pure
  $ f --sha256 .hg/store/00changelog-*.nd --size
  .hg/store/00changelog-????????????????.nd: size=121344, sha256=cce54c5da5bde3ad72a4938673ed4064c86231b9c64376b082b163fdb20f8f66 (glob)
#endif

#if rust
  $ f --sha256 .hg/store/00changelog-*.nd --size
  .hg/store/00changelog-????????????????.nd: size=121344, sha256=952b042fcf614ceb37b542b1b723e04f18f83efe99bee4e0f5ccd232ef470e58 (glob)
#endif

#if no-pure no-rust
  $ f --sha256 .hg/store/00changelog-*.nd --size
  .hg/store/00changelog-????????????????.nd: size=121088, sha256=df7c06a035b96cb28c7287d349d603baef43240be7736fe34eea419a49702e17 (glob)
#endif

  $ hg debugnodemap --check
  revision in index:   5002
  revision in nodemap: 5002

Test code path without mmap
---------------------------

  $ echo bar > bar
  $ hg add bar
  $ hg ci -m 'bar' --config experimental.exp-persistent-nodemap.mmap=no

  $ hg debugnodemap --check --config experimental.exp-persistent-nodemap.mmap=yes
  revision in index:   5003
  revision in nodemap: 5003
  $ hg debugnodemap --check --config experimental.exp-persistent-nodemap.mmap=no
  revision in index:   5003
  revision in nodemap: 5003


#if pure
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5002
  tip-node: 880b18d239dfa9f632413a2071bfdbcc4806a4fd
  data-length: 121600
  data-unused: 512
  data-unused: 0.421%
  $ f --sha256 .hg/store/00changelog-*.nd --size
  .hg/store/00changelog-????????????????.nd: size=121600, sha256=def52503d049ccb823974af313a98a935319ba61f40f3aa06a8be4d35c215054 (glob)
#endif
#if rust
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5002
  tip-node: 880b18d239dfa9f632413a2071bfdbcc4806a4fd
  data-length: 121600
  data-unused: 512
  data-unused: 0.421%
  $ f --sha256 .hg/store/00changelog-*.nd --size
  .hg/store/00changelog-????????????????.nd: size=121600, sha256=dacf5b5f1d4585fee7527d0e67cad5b1ba0930e6a0928f650f779aefb04ce3fb (glob)
#endif
#if no-pure no-rust
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5002
  tip-node: 880b18d239dfa9f632413a2071bfdbcc4806a4fd
  data-length: 121088
  data-unused: 0
  data-unused: 0.000%
  $ f --sha256 .hg/store/00changelog-*.nd --size
  .hg/store/00changelog-????????????????.nd: size=121088, sha256=59fcede3e3cc587755916ceed29e3c33748cd1aa7d2f91828ac83e7979d935e8 (glob)
#endif

Test force warming the cache

  $ rm .hg/store/00changelog.n
  $ hg debugnodemap --metadata
  $ hg debugupdatecache
#if pure
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5002
  tip-node: 880b18d239dfa9f632413a2071bfdbcc4806a4fd
  data-length: 121088
  data-unused: 0
  data-unused: 0.000%
#else
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5002
  tip-node: 880b18d239dfa9f632413a2071bfdbcc4806a4fd
  data-length: 121088
  data-unused: 0
  data-unused: 0.000%
#endif

Check out of sync nodemap
=========================

First copy old data on the side.

  $ mkdir ../tmp-copies
  $ cp .hg/store/00changelog-????????????????.nd .hg/store/00changelog.n ../tmp-copies

Nodemap lagging behind
----------------------

make a new commit

  $ echo bar2 > bar
  $ hg ci -m 'bar2'
  $ NODE=`hg log -r tip -T '{node}\n'`
  $ hg log -r "$NODE" -T '{rev}\n'
  5003

If the nodemap is lagging behind, it can catch up fine

  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5003
  tip-node: c9329770f979ade2d16912267c38ba5f82fd37b3
  data-length: 121344 (pure !)
  data-length: 121344 (rust !)
  data-length: 121152 (no-rust no-pure !)
  data-unused: 192 (pure !)
  data-unused: 192 (rust !)
  data-unused: 0 (no-rust no-pure !)
  data-unused: 0.158% (pure !)
  data-unused: 0.158% (rust !)
  data-unused: 0.000% (no-rust no-pure !)
  $ cp -f ../tmp-copies/* .hg/store/
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5002
  tip-node: 880b18d239dfa9f632413a2071bfdbcc4806a4fd
  data-length: 121088
  data-unused: 0
  data-unused: 0.000%
  $ hg log -r "$NODE" -T '{rev}\n'
  5003

changelog altered
-----------------

If the nodemap is not gated behind a requirements, an unaware client can alter
the repository so the revlog used to generate the nodemap is not longer
compatible with the persistent nodemap. We need to detect that.

  $ hg up "$NODE~5"
  0 files updated, 0 files merged, 4 files removed, 0 files unresolved
  $ echo bar > babar
  $ hg add babar
  $ hg ci -m 'babar'
  created new head
  $ OTHERNODE=`hg log -r tip -T '{node}\n'`
  $ hg log -r "$OTHERNODE" -T '{rev}\n'
  5004

  $ hg --config extensions.strip= strip --rev "$NODE~1" --no-backup

the nodemap should detect the changelog have been tampered with and recover.

  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5002
  tip-node: b355ef8adce0949b8bdf6afc72ca853740d65944
  data-length: 121536 (pure !)
  data-length: 121088 (rust !)
  data-length: 121088 (no-pure no-rust !)
  data-unused: 448 (pure !)
  data-unused: 0 (rust !)
  data-unused: 0 (no-pure no-rust !)
  data-unused: 0.000% (rust !)
  data-unused: 0.369% (pure !)
  data-unused: 0.000% (no-pure no-rust !)

  $ cp -f ../tmp-copies/* .hg/store/
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5002
  tip-node: 880b18d239dfa9f632413a2071bfdbcc4806a4fd
  data-length: 121088
  data-unused: 0
  data-unused: 0.000%
  $ hg log -r "$OTHERNODE" -T '{rev}\n'
  5002

Check transaction related property
==================================

An up to date nodemap should be available to shell hooks,

  $ echo dsljfl > a
  $ hg add a
  $ hg ci -m a
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5003
  tip-node: a52c5079765b5865d97b993b303a18740113bbb2
  data-length: 121088
  data-unused: 0
  data-unused: 0.000%
  $ echo babar2 > babar
  $ hg ci -m 'babar2' --config "hooks.pretxnclose.nodemap-test=hg debugnodemap --metadata"
  uid: ???????????????? (glob)
  tip-rev: 5004
  tip-node: 2f5fb1c06a16834c5679d672e90da7c5f3b1a984
  data-length: 121280 (pure !)
  data-length: 121280 (rust !)
  data-length: 121088 (no-pure no-rust !)
  data-unused: 192 (pure !)
  data-unused: 192 (rust !)
  data-unused: 0 (no-pure no-rust !)
  data-unused: 0.158% (pure !)
  data-unused: 0.158% (rust !)
  data-unused: 0.000% (no-pure no-rust !)
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5004
  tip-node: 2f5fb1c06a16834c5679d672e90da7c5f3b1a984
  data-length: 121280 (pure !)
  data-length: 121280 (rust !)
  data-length: 121088 (no-pure no-rust !)
  data-unused: 192 (pure !)
  data-unused: 192 (rust !)
  data-unused: 0 (no-pure no-rust !)
  data-unused: 0.158% (pure !)
  data-unused: 0.158% (rust !)
  data-unused: 0.000% (no-pure no-rust !)

Another process does not see the pending nodemap content during run.

  $ PATH=$RUNTESTDIR/testlib/:$PATH
  $ echo qpoasp > a
  $ hg ci -m a2 \
  > --config "hooks.pretxnclose=wait-on-file 20 sync-repo-read sync-txn-pending" \
  > --config "hooks.txnclose=touch sync-txn-close" > output.txt 2>&1 &

(read the repository while the commit transaction is pending)

  $ wait-on-file 20 sync-txn-pending && \
  > hg debugnodemap --metadata && \
  > wait-on-file 20 sync-txn-close sync-repo-read
  uid: ???????????????? (glob)
  tip-rev: 5004
  tip-node: 2f5fb1c06a16834c5679d672e90da7c5f3b1a984
  data-length: 121280 (pure !)
  data-length: 121280 (rust !)
  data-length: 121088 (no-pure no-rust !)
  data-unused: 192 (pure !)
  data-unused: 192 (rust !)
  data-unused: 0 (no-pure no-rust !)
  data-unused: 0.158% (pure !)
  data-unused: 0.158% (rust !)
  data-unused: 0.000% (no-pure no-rust !)
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5005
  tip-node: 90d5d3ba2fc47db50f712570487cb261a68c8ffe
  data-length: 121536 (pure !)
  data-length: 121536 (rust !)
  data-length: 121088 (no-pure no-rust !)
  data-unused: 448 (pure !)
  data-unused: 448 (rust !)
  data-unused: 0 (no-pure no-rust !)
  data-unused: 0.369% (pure !)
  data-unused: 0.369% (rust !)
  data-unused: 0.000% (no-pure no-rust !)

  $ cat output.txt

Check that a failing transaction will properly revert the data

  $ echo plakfe > a
  $ f --size --sha256 .hg/store/00changelog-*.nd
  .hg/store/00changelog-????????????????.nd: size=121536, sha256=bb414468d225cf52d69132e1237afba34d4346ee2eb81b505027e6197b107f03 (glob) (pure !)
  .hg/store/00changelog-????????????????.nd: size=121536, sha256=909ac727bc4d1c0fda5f7bff3c620c98bd4a2967c143405a1503439e33b377da (glob) (rust !)
  .hg/store/00changelog-????????????????.nd: size=121088, sha256=342d36d30d86dde67d3cb6c002606c4a75bcad665595d941493845066d9c8ee0 (glob) (no-pure no-rust !)
  $ hg ci -m a3 --config "extensions.abort=$RUNTESTDIR/testlib/crash_transaction_late.py"
  transaction abort!
  rollback completed
  abort: This is a late abort
  [255]
  $ hg debugnodemap --metadata
  uid: ???????????????? (glob)
  tip-rev: 5005
  tip-node: 90d5d3ba2fc47db50f712570487cb261a68c8ffe
  data-length: 121536 (pure !)
  data-length: 121536 (rust !)
  data-length: 121088 (no-pure no-rust !)
  data-unused: 448 (pure !)
  data-unused: 448 (rust !)
  data-unused: 0 (no-pure no-rust !)
  data-unused: 0.369% (pure !)
  data-unused: 0.369% (rust !)
  data-unused: 0.000% (no-pure no-rust !)
  $ f --size --sha256 .hg/store/00changelog-*.nd
  .hg/store/00changelog-????????????????.nd: size=121536, sha256=bb414468d225cf52d69132e1237afba34d4346ee2eb81b505027e6197b107f03 (glob) (pure !)
  .hg/store/00changelog-????????????????.nd: size=121536, sha256=909ac727bc4d1c0fda5f7bff3c620c98bd4a2967c143405a1503439e33b377da (glob) (rust !)
  .hg/store/00changelog-????????????????.nd: size=121088, sha256=342d36d30d86dde67d3cb6c002606c4a75bcad665595d941493845066d9c8ee0 (glob) (no-pure no-rust !)