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From "Tommaso Teofili (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-5192) Reduce Lucene related growth of repository size
Date Mon, 03 Jul 2017 10:21:00 GMT

    [ https://issues.apache.org/jira/browse/OAK-5192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16072225#comment-16072225
] 

Tommaso Teofili commented on OAK-5192:
--------------------------------------

the above results come from the unit test I've just committed to my github fork: https://github.com/tteofili/jackrabbit-oak/commit/85bba494d13fc76bffe0d3e1d78d27de34ec465f

I'll update the fixVersion according to my expectations.

> Reduce Lucene related growth of repository size
> -----------------------------------------------
>
>                 Key: OAK-5192
>                 URL: https://issues.apache.org/jira/browse/OAK-5192
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: lucene, segment-tar
>            Reporter: Michael Dürig
>            Assignee: Tommaso Teofili
>              Labels: perfomance, scalability
>             Fix For: 1.8, 1.7.8
>
>         Attachments: added-bytes-zoom.png, binSize100.txt, binSize16384.txt, binSizeTotal.txt,
diff.txt.zip, nonBinSizeTotal.txt, OAK-5192.0.patch
>
>
> I observed Lucene indexing contributing to up to 99% of repository growth. While the
size of the index itself is well inside reasonable bounds, the overall turnover of data being
written and removed again can be as much as 99%. 
> In the case of the TarMK this negatively impacts overall system performance due to fast
growing number of tar files / segments, bad locality of reference, cache misses/thrashing
when looking up segments and vastly prolonged garbage collection cycles.



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