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maps: do not ask sqlite for row count
"SELECT COUNT(1) FROM x" is not O(1) for sqlite and can be slow on large
tables. This patch changes the count to be backed by a file instead.
The change exposes a risk that the number may become inaccurate, if
__setitem__ is called with a same key multiple times. But we don't do that
during pull, and only use __len__ to calculate how many revisions pulled,
or test if the map is empty. So it would be fine.
| author | Jun Wu <quark@fb.com> |
|---|---|
| date | Thu, 23 Jun 2016 10:46:07 +0100 |
| parents | b6b1365e3489 |
| children |
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SVN-fs-dump-format-version: 2 UUID: 01df53ad-5d72-4756-8742-f669dc98f791 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2012-05-13T22:22:43.218190Z PROPS-END Revision-number: 1 Prop-content-length: 118 Content-length: 118 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:44.112163Z K 7 svn:log V 17 initial structure PROPS-END Node-path: branches Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Revision-number: 2 Prop-content-length: 103 Content-length: 103 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:45.111247Z K 7 svn:log V 3 ci1 PROPS-END Node-path: trunk/a Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Text-content-sha1: 3f786850e387550fdab836ed7e6dc881de23001b Content-length: 12 PROPS-END a Revision-number: 3 Prop-content-length: 111 Content-length: 111 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:48.110257Z K 7 svn:log V 10 branch foo PROPS-END Node-path: branches/foo Node-kind: dir Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk Revision-number: 4 Prop-content-length: 107 Content-length: 107 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:49.115096Z K 7 svn:log V 7 symlink PROPS-END Node-path: branches/foo/fnord Node-kind: file Node-action: add Prop-content-length: 33 Text-content-length: 6 Text-content-md5: c118dba188202a1efc975bef6064180b Text-content-sha1: 41f94e4692313bf7f7c92aa600002f1dff93d6bf Content-length: 39 K 11 svn:special V 1 * PROPS-END link a Revision-number: 5 Prop-content-length: 105 Content-length: 105 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:50.119266Z K 7 svn:log V 5 spacy PROPS-END Node-path: branches/foo/spacy name Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: branches/foo/spacy name/spacy file Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Text-content-sha1: 3f786850e387550fdab836ed7e6dc881de23001b Content-length: 12 PROPS-END a Revision-number: 6 Prop-content-length: 105 Content-length: 105 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:52.123367Z K 7 svn:log V 5 tilde PROPS-END Node-path: branches/foo/spacy name/surprise ~ Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 3b5d5c3712955042212316173ccf37be Text-content-sha1: 89e6c98d92887913cadf06b2adb97f26cde4849b Content-length: 12 PROPS-END b Revision-number: 7 Prop-content-length: 111 Content-length: 111 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:54.129462Z K 7 svn:log V 10 executable PROPS-END Node-path: branches/foo/exe Node-kind: file Node-action: add Prop-content-length: 36 Text-content-length: 4 Text-content-md5: d3b07384d113edec49eaa6238ad5ff00 Text-content-sha1: f1d2d2f924e986ac86fdf7b36c94bcdf32beec15 Content-length: 40 K 14 svn:executable V 1 * PROPS-END foo Revision-number: 8 Prop-content-length: 105 Content-length: 105 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:57.111370Z K 7 svn:log V 5 merge PROPS-END Node-path: trunk Node-kind: dir Node-action: change Prop-content-length: 52 Content-length: 52 K 13 svn:mergeinfo V 17 /branches/foo:3-7 PROPS-END Node-path: trunk/exe Node-kind: file Node-action: add Node-copyfrom-rev: 7 Node-copyfrom-path: branches/foo/exe Text-copy-source-md5: d3b07384d113edec49eaa6238ad5ff00 Text-copy-source-sha1: f1d2d2f924e986ac86fdf7b36c94bcdf32beec15 Node-path: trunk/fnord Node-kind: file Node-action: add Node-copyfrom-rev: 7 Node-copyfrom-path: branches/foo/fnord Text-copy-source-md5: c118dba188202a1efc975bef6064180b Text-copy-source-sha1: 41f94e4692313bf7f7c92aa600002f1dff93d6bf Node-path: trunk/spacy name Node-kind: dir Node-action: add Node-copyfrom-rev: 7 Node-copyfrom-path: branches/foo/spacy name