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https://issues.apache.org/jira/browse/OAK-5472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15827504#comment-15827504
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Chetan Mehrotra commented on OAK-5472:
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[~mreutegg] [~catholicon] Thoughts?
> 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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