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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 | 9c3b4f59e7e6 |
| children |
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SVN-fs-dump-format-version: 2 UUID: 307f02f4-2d74-44cb-98a4-4e162241d396 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2012-10-06T08:50:46.559327Z PROPS-END Revision-number: 1 Prop-content-length: 105 Content-length: 105 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2012-10-06T08:50:46.581582Z K 7 svn:log V 4 init PROPS-END Node-path: trunk Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 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 Node-path: trunk/dir Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/dir/b 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: 2 Prop-content-length: 113 Content-length: 113 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2012-10-06T08:50:47.048033Z K 7 svn:log V 11 changefiles PROPS-END Node-path: trunk/a Node-kind: file Node-action: change Text-content-length: 4 Text-content-md5: 0d227f1abf8c2932d342e9b99cc957eb Text-content-sha1: d7c8127a20a396cff08af086a1c695b0636f0c29 Content-length: 4 a a Node-path: trunk/dir/b Node-kind: file Node-action: change Text-content-length: 4 Text-content-md5: 06ac26ed8b614fc0b141e4542aa067c2 Text-content-sha1: f6980469e74f7125178e88ec571e06fe6ce86e95 Content-length: 4 b b Revision-number: 3 Prop-content-length: 107 Content-length: 107 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2012-10-06T08:50:50.058224Z K 7 svn:log V 6 revert PROPS-END Node-path: trunk Node-kind: dir Node-action: delete Node-path: trunk Node-kind: dir Node-action: add Node-copyfrom-rev: 1 Node-copyfrom-path: trunk Revision-number: 4 Prop-content-length: 108 Content-length: 108 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2012-10-06T08:50:54.047396Z K 7 svn:log V 7 revert2 PROPS-END Node-path: trunk/a Node-kind: file Node-action: delete Node-path: trunk/a Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/a Text-copy-source-md5: 0d227f1abf8c2932d342e9b99cc957eb Text-copy-source-sha1: d7c8127a20a396cff08af086a1c695b0636f0c29 Node-path: trunk/dir/b Node-kind: file Node-action: delete Node-path: trunk/dir/b Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/dir/b Text-copy-source-md5: 06ac26ed8b614fc0b141e4542aa067c2 Text-copy-source-sha1: f6980469e74f7125178e88ec571e06fe6ce86e95