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view tests/test-verify.t @ 39492:a33f394b2bfd
snapshot: try intermediate snapshot against parents' base
# Regarding The Series Started By This Changeset
This is the first changesets of a group adjusting delta chain strategy to
build a useful chain of intermediate snapshots. The series will introduce a
full strategy to produce chains of multiple snapshots on top of which a
"usual" delta chain will be built.
That strategy will have multiple steps to maximize snapshot reuse, avoiding
pathological cases and improving overall compression in very branchy
repositories. An important property of sparse-revlog using such snapshot-chain
is that they can use very short delta chain without problematic impact on the
resulting compression. Shorter delta chains are important to achieve good
performance.
To make each step clear, we'll introduce them one by one.
See the end of this series for full details.
# Regarding This Changeset
Before this change, if we cannot store the current revision as a delta against
a "simple" candidate (p1, p2, prev), we created a new level-0 snapshot (also
called full snapshot).
As the first step, we introduce a simple strategy: try an intermediate level-1
snapshot against the chain base of the "current revision" parents.
The "current revision" is the one we are currently trying to store in the
revlog, triggering this search for a good delta base.
The first item in the chain is always a level-0 snapshot.
# Effect On The Test Repository
We can already see the effect on the test-repository. Most of the snapshots
have shifted from level 0 to level 1. The overall size has slightly decreased.
(However, keep in mind that this repository only emulates real data)
# Regarding Statistic
The current series focuses on improving the chain built. Improving the
performance of this logic will be done as a second step. Sparse-revlog is
still experimental and disabled by default.
We'll provide more statistic about resulting size and delta chain at the end
of this series.
author | Boris Feld <boris.feld@octobus.net> |
---|---|
date | Fri, 07 Sep 2018 11:17:29 -0400 |
parents | f1186c292d03 |
children | e1936ae27897 |
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#require reporevlogstore prepare repo $ hg init a $ cd a $ echo "some text" > FOO.txt $ echo "another text" > bar.txt $ echo "more text" > QUICK.txt $ hg add adding FOO.txt adding QUICK.txt adding bar.txt $ hg ci -mtest1 verify $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 1 changesets with 3 changes to 3 files verify with journal $ touch .hg/store/journal $ hg verify abandoned transaction found - run hg recover checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 1 changesets with 3 changes to 3 files $ rm .hg/store/journal introduce some bugs in repo $ cd .hg/store/data $ mv _f_o_o.txt.i X_f_o_o.txt.i $ mv bar.txt.i xbar.txt.i $ rm _q_u_i_c_k.txt.i $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files warning: revlog 'data/FOO.txt.i' not in fncache! 0: empty or missing FOO.txt FOO.txt@0: manifest refers to unknown revision f62022d3d590 warning: revlog 'data/QUICK.txt.i' not in fncache! 0: empty or missing QUICK.txt QUICK.txt@0: manifest refers to unknown revision 88b857db8eba warning: revlog 'data/bar.txt.i' not in fncache! 0: empty or missing bar.txt bar.txt@0: manifest refers to unknown revision 256559129457 checked 1 changesets with 0 changes to 3 files 3 warnings encountered! hint: run "hg debugrebuildfncache" to recover from corrupt fncache 6 integrity errors encountered! (first damaged changeset appears to be 0) [1] $ cd ../../.. $ cd .. Set up a repo for testing missing revlog entries $ hg init missing-entries $ cd missing-entries $ echo 0 > file $ hg ci -Aqm0 $ cp -R .hg/store .hg/store-partial $ echo 1 > file $ hg ci -Aqm1 $ cp -R .hg/store .hg/store-full Entire changelog missing $ rm .hg/store/00changelog.* $ hg verify -q 0: empty or missing changelog manifest@0: d0b6632564d4 not in changesets manifest@1: 941fc4534185 not in changesets 3 integrity errors encountered! (first damaged changeset appears to be 0) [1] $ cp -R .hg/store-full/. .hg/store Entire manifest log missing $ rm .hg/store/00manifest.* $ hg verify -q 0: empty or missing manifest 1 integrity errors encountered! (first damaged changeset appears to be 0) [1] $ cp -R .hg/store-full/. .hg/store Entire filelog missing $ rm .hg/store/data/file.* $ hg verify -q warning: revlog 'data/file.i' not in fncache! 0: empty or missing file file@0: manifest refers to unknown revision 362fef284ce2 file@1: manifest refers to unknown revision c10f2164107d 1 warnings encountered! hint: run "hg debugrebuildfncache" to recover from corrupt fncache 3 integrity errors encountered! (first damaged changeset appears to be 0) [1] $ cp -R .hg/store-full/. .hg/store Entire changelog and manifest log missing $ rm .hg/store/00changelog.* $ rm .hg/store/00manifest.* $ hg verify -q warning: orphan data file 'data/file.i' 1 warnings encountered! $ cp -R .hg/store-full/. .hg/store Entire changelog and filelog missing $ rm .hg/store/00changelog.* $ rm .hg/store/data/file.* $ hg verify -q 0: empty or missing changelog manifest@0: d0b6632564d4 not in changesets manifest@1: 941fc4534185 not in changesets warning: revlog 'data/file.i' not in fncache! ?: empty or missing file file@0: manifest refers to unknown revision 362fef284ce2 file@1: manifest refers to unknown revision c10f2164107d 1 warnings encountered! hint: run "hg debugrebuildfncache" to recover from corrupt fncache 6 integrity errors encountered! (first damaged changeset appears to be 0) [1] $ cp -R .hg/store-full/. .hg/store Entire manifest log and filelog missing $ rm .hg/store/00manifest.* $ rm .hg/store/data/file.* $ hg verify -q 0: empty or missing manifest warning: revlog 'data/file.i' not in fncache! 0: empty or missing file 1 warnings encountered! hint: run "hg debugrebuildfncache" to recover from corrupt fncache 2 integrity errors encountered! (first damaged changeset appears to be 0) [1] $ cp -R .hg/store-full/. .hg/store Changelog missing entry $ cp -f .hg/store-partial/00changelog.* .hg/store $ hg verify -q manifest@?: rev 1 points to nonexistent changeset 1 manifest@?: 941fc4534185 not in changesets file@?: rev 1 points to nonexistent changeset 1 (expected 0) 1 warnings encountered! 3 integrity errors encountered! [1] $ cp -R .hg/store-full/. .hg/store Manifest log missing entry $ cp -f .hg/store-partial/00manifest.* .hg/store $ hg verify -q manifest@1: changeset refers to unknown revision 941fc4534185 file@1: c10f2164107d not in manifests 2 integrity errors encountered! (first damaged changeset appears to be 1) [1] $ cp -R .hg/store-full/. .hg/store Filelog missing entry $ cp -f .hg/store-partial/data/file.* .hg/store/data $ hg verify -q file@1: manifest refers to unknown revision c10f2164107d 1 integrity errors encountered! (first damaged changeset appears to be 1) [1] $ cp -R .hg/store-full/. .hg/store Changelog and manifest log missing entry $ cp -f .hg/store-partial/00changelog.* .hg/store $ cp -f .hg/store-partial/00manifest.* .hg/store $ hg verify -q file@?: rev 1 points to nonexistent changeset 1 (expected 0) file@?: c10f2164107d not in manifests 1 warnings encountered! 2 integrity errors encountered! [1] $ cp -R .hg/store-full/. .hg/store Changelog and filelog missing entry $ cp -f .hg/store-partial/00changelog.* .hg/store $ cp -f .hg/store-partial/data/file.* .hg/store/data $ hg verify -q manifest@?: rev 1 points to nonexistent changeset 1 manifest@?: 941fc4534185 not in changesets file@?: manifest refers to unknown revision c10f2164107d 3 integrity errors encountered! [1] $ cp -R .hg/store-full/. .hg/store Manifest and filelog missing entry $ cp -f .hg/store-partial/00manifest.* .hg/store $ cp -f .hg/store-partial/data/file.* .hg/store/data $ hg verify -q manifest@1: changeset refers to unknown revision 941fc4534185 1 integrity errors encountered! (first damaged changeset appears to be 1) [1] $ cp -R .hg/store-full/. .hg/store Corrupt changelog base node to cause failure to read revision $ printf abcd | dd conv=notrunc of=.hg/store/00changelog.i bs=1 seek=16 \ > 2> /dev/null $ hg verify -q 0: unpacking changeset 08b1860757c2: * (glob) manifest@?: rev 0 points to unexpected changeset 0 manifest@?: d0b6632564d4 not in changesets file@?: rev 0 points to unexpected changeset 0 (expected 1) 1 warnings encountered! 4 integrity errors encountered! (first damaged changeset appears to be 0) [1] $ cp -R .hg/store-full/. .hg/store Corrupt manifest log base node to cause failure to read revision $ printf abcd | dd conv=notrunc of=.hg/store/00manifest.i bs=1 seek=16 \ > 2> /dev/null $ hg verify -q manifest@0: reading delta d0b6632564d4: * (glob) file@0: 362fef284ce2 not in manifests 2 integrity errors encountered! (first damaged changeset appears to be 0) [1] $ cp -R .hg/store-full/. .hg/store Corrupt filelog base node to cause failure to read revision $ printf abcd | dd conv=notrunc of=.hg/store/data/file.i bs=1 seek=16 \ > 2> /dev/null $ hg verify -q file@0: unpacking 362fef284ce2: * (glob) 1 integrity errors encountered! (first damaged changeset appears to be 0) [1] $ cp -R .hg/store-full/. .hg/store $ cd .. test changelog without a manifest $ hg init b $ cd b $ hg branch foo marked working directory as branch foo (branches are permanent and global, did you want a bookmark?) $ hg ci -m branchfoo $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 1 changesets with 0 changes to 0 files test revlog corruption $ touch a $ hg add a $ hg ci -m a $ echo 'corrupted' > b $ dd if=.hg/store/data/a.i of=start bs=1 count=20 2>/dev/null $ cat start b > .hg/store/data/a.i $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files a@1: broken revlog! (index data/a.i is corrupted) warning: orphan data file 'data/a.i' checked 2 changesets with 0 changes to 1 files 1 warnings encountered! 1 integrity errors encountered! (first damaged changeset appears to be 1) [1] $ cd .. test revlog format 0 $ revlog-formatv0.py $ cd formatv0 $ hg verify repository uses revlog format 0 checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 1 changesets with 1 changes to 1 files $ cd .. test flag processor and skipflags $ hg init skipflags $ cd skipflags $ cat >> .hg/hgrc <<EOF > [extensions] > flagprocessor=$RUNTESTDIR/flagprocessorext.py > EOF $ echo '[BASE64]content' > base64 $ hg commit -Aqm 'flag processor content' base64 $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 1 changesets with 1 changes to 1 files $ cat >> $TESTTMP/break-base64.py <<EOF > from __future__ import absolute_import > import base64 > base64.b64decode=lambda x: x > EOF $ cat >> .hg/hgrc <<EOF > breakbase64=$TESTTMP/break-base64.py > EOF $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files base64@0: unpacking 794cee7777cb: integrity check failed on data/base64.i:0 checked 1 changesets with 1 changes to 1 files 1 integrity errors encountered! (first damaged changeset appears to be 0) [1] $ hg verify --config verify.skipflags=2147483647 checking changesets checking manifests crosschecking files in changesets and manifests checking files checked 1 changesets with 1 changes to 1 files