Chetan Mehrotra created OAK-5472:
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Summary: Use relaxed write concern for document deletion
Key: OAK-5472
URL: https://issues.apache.org/jira/browse/OAK-5472
Project: Jackrabbit Oak
Issue Type: Improvement
Components: mongomk
Reporter: Chetan Mehrotra
Fix For: 1.8
On some setups having w=2 the VersionGC is running slowly taking upto 3-4 hrs
for ~200k docs
{noformat}
17.01.2017 05:47:26.845 *INFO* [sling-oak-observation-15098]
org.apache.jackrabbit.oak.plugins.document.VersionGarbageCollector Revision
garbage collection finished in 3.783 h.
VersionGCStats{ignoredGCDueToCheckPoint=false, deletedDocGCCount=191573,
splitDocGCCount=380, intermediateSplitDocGCCount=32,
timeToCollectDeletedDocs=3.771 h, timeTakenToDeleteDeletedDocs=40.35 s,
timeTakenToCollectAndDeleteSplitDocs=1.487 s}
16.01.2017 04:14:26.001 *INFO* [sling-oak-observation-10770]
org.apache.jackrabbit.oak.plugins.document.VersionGarbageCollector Revision
garbage collection finished in 2.236 h.
VersionGCStats{ignoredGCDueToCheckPoint=false, deletedDocGCCount=260292,
splitDocGCCount=699, intermediateSplitDocGCCount=53,
timeToCollectDeletedDocs=2.220 h, timeTakenToDeleteDeletedDocs=55.27 s,
timeTakenToCollectAndDeleteSplitDocs=2.051 s}
{noformat}
Compared to that as can be seen in OAK-2613 that ~500k docs were being
collected in ~30 mins.
I think the increase in time is due to specifying w=2. For deletion it should
ok to specify a custom write concern of w=1 or more relaxed as consistency here
is not that critical
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