[jira] [Commented] (OAK-5472) Use relaxed write concern for document deletion

["Chetan Mehrotra (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-5472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15827504#comment-15827504 ] 

Chetan Mehrotra commented on OAK-5472:
--------------------------------------

[~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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