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view tests/fixtures/project_root_not_repo_root.svndump @ 1233:0d0132cba155
editor: fix edge case with in memory file-store size limit
There are a few cases where we will set a single file into to the
editor's FileStore object more than once. Notably, for copied and
then modified files, we will set it at least twice. Three times if
editing fails (which it can for symlinks).
If we pass the in-memory storage limit in between the first (or second
if editing fails) time we set the file and the last time we set the
file, we will write the data to the in memory store the first time and
the file store the last time. We didn't remove it form the in-memory
store though, and we always prefer reading from the in-memory store.
This means we can sometimes end up with the wrong version of a file.
This is fairly unlikely to happen in normal use since you need to hit
the memory limit between two writes to the store for the same file.
We only write a file multiple times if a) the file (and not one of
it's parent directories) is copied and then modified or b) editing
fails. From what I can tell, it's only common for editing to fail for
symlinks, and they ten to be relatively small data that is unlikely to
push over the limit. Finally, the default limit is 100MB which I
would expect to be most often either well over (source code) or well
under (binaries or automated changes) the size of the changes files in
a single commit.
The easiest way to reproduce this is to set the in-memory cache size
to 0 and then commit a copied and modified symlink. The empty-string
version from the failed editing will be the one that persists. I
happened to stumble upon this while trying (and failing) to test a
bug-fix for a related bug with identical symptoms (empty simlink). I
have seen this in the wild, once, but couldn't reproduce it at the
time. The repo in question is quite large and quite active, so I am
quite confident in my estimation that this is a real, but very rare,
problem.
The test changes attached to this was mneant to test a related bug,
but turned out not to actually cover the bug in question. They did
trigger this bug though, and are worthwhile to test, so I kept them.
| author | David Schleimer <dschleimer@fb.com> |
|---|---|
| date | Mon, 07 Apr 2014 17:51:59 -0700 |
| parents | 537de0300510 |
| children |
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SVN-fs-dump-format-version: 2 UUID: 1916bd89-caf8-4f3d-96a7-7d5a7968f6ea Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2008-10-09T15:32:50.842663Z PROPS-END Revision-number: 1 Prop-content-length: 111 Content-length: 111 K 7 svn:log V 11 Empty dirs. K 10 svn:author V 5 durin K 8 svn:date V 27 2008-10-09T15:32:51.151627Z PROPS-END Node-path: dummyproj Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: dummyproj/branches Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: dummyproj/tags Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: dummyproj/trunk Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Revision-number: 2 Prop-content-length: 114 Content-length: 114 K 7 svn:log V 14 Initial Files. K 10 svn:author V 5 durin K 8 svn:date V 27 2008-10-09T15:32:52.149125Z PROPS-END Node-path: dummyproj/trunk/alpha Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 15 Text-content-md5: 8717538ba2f18a613eaa4892e8d178f7 Content-length: 25 PROPS-END This is alpha. Node-path: dummyproj/trunk/beta Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 14 Text-content-md5: 952a13b33256f343982d0a8f0e0af277 Content-length: 24 PROPS-END This is beta. Node-path: dummyproj/trunk/delta Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 15 Text-content-md5: e48d0bca73f04e800e7bd9fb58d49a62 Content-length: 25 PROPS-END This is delta. Revision-number: 3 Prop-content-length: 110 Content-length: 110 K 7 svn:log V 10 Tag rev 1. K 10 svn:author V 5 durin K 8 svn:date V 27 2008-10-09T15:32:54.131909Z PROPS-END Node-path: dummyproj/tags/rev1 Node-kind: dir Node-action: add Node-copyfrom-rev: 1 Node-copyfrom-path: dummyproj/trunk Prop-content-length: 34 Content-length: 34 K 13 svn:mergeinfo V 0 PROPS-END Node-path: dummyproj/tags/rev1/alpha Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: dummyproj/trunk/alpha Text-copy-source-md5: 8717538ba2f18a613eaa4892e8d178f7 Node-path: dummyproj/tags/rev1/beta Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: dummyproj/trunk/beta Text-copy-source-md5: 952a13b33256f343982d0a8f0e0af277 Node-path: dummyproj/tags/rev1/delta Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: dummyproj/trunk/delta Text-copy-source-md5: e48d0bca73f04e800e7bd9fb58d49a62 Revision-number: 4 Prop-content-length: 116 Content-length: 116 K 7 svn:log V 16 Branch to crazy. K 10 svn:author V 5 durin K 8 svn:date V 27 2008-10-09T15:32:56.132149Z PROPS-END Node-path: dummyproj/branches/crazy Node-kind: dir Node-action: add Node-copyfrom-rev: 1 Node-copyfrom-path: dummyproj/trunk Prop-content-length: 34 Content-length: 34 K 13 svn:mergeinfo V 0 PROPS-END Node-path: dummyproj/branches/crazy/alpha Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: dummyproj/trunk/alpha Text-copy-source-md5: 8717538ba2f18a613eaa4892e8d178f7 Node-path: dummyproj/branches/crazy/beta Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: dummyproj/trunk/beta Text-copy-source-md5: 952a13b33256f343982d0a8f0e0af277 Node-path: dummyproj/branches/crazy/delta Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: dummyproj/trunk/delta Text-copy-source-md5: e48d0bca73f04e800e7bd9fb58d49a62 Revision-number: 5 Prop-content-length: 108 Content-length: 108 K 7 svn:log V 9 Add gamma K 10 svn:author V 5 durin K 8 svn:date V 27 2008-10-09T15:32:57.142842Z PROPS-END Node-path: dummyproj/trunk/gamma Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 15 Text-content-md5: 255b705986e84fbb13db9c5a832739ae Content-length: 25 PROPS-END This is gamma. Revision-number: 6 Prop-content-length: 108 Content-length: 108 K 7 svn:log V 9 Add omega K 10 svn:author V 5 durin K 8 svn:date V 27 2008-10-09T15:32:58.146324Z PROPS-END Node-path: dummyproj/branches/crazy/omega Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 15 Text-content-md5: 22219e00c8dbb47ce790f0eb658e8014 Content-length: 25 PROPS-END This is omega. Revision-number: 7 Prop-content-length: 121 Content-length: 121 K 7 svn:log V 21 Branch to more_crazy. K 10 svn:author V 5 durin K 8 svn:date V 27 2008-10-09T15:33:00.138992Z PROPS-END Node-path: dummyproj/branches/more_crazy Node-kind: dir Node-action: add Node-copyfrom-rev: 1 Node-copyfrom-path: dummyproj/trunk Prop-content-length: 34 Content-length: 34 K 13 svn:mergeinfo V 0 PROPS-END Node-path: dummyproj/branches/more_crazy/alpha Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: dummyproj/trunk/alpha Text-copy-source-md5: 8717538ba2f18a613eaa4892e8d178f7 Node-path: dummyproj/branches/more_crazy/beta Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: dummyproj/trunk/beta Text-copy-source-md5: 952a13b33256f343982d0a8f0e0af277 Node-path: dummyproj/branches/more_crazy/delta Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: dummyproj/trunk/delta Text-copy-source-md5: e48d0bca73f04e800e7bd9fb58d49a62 Node-path: dummyproj/branches/more_crazy/gamma Node-kind: file Node-action: add Node-copyfrom-rev: 5 Node-copyfrom-path: dummyproj/trunk/gamma Text-copy-source-md5: 255b705986e84fbb13db9c5a832739ae