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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Updated] (OAK-5192) Reduce Lucene related growth of repository size
Date Thu, 22 Dec 2016 14:37:58 GMT

     [ https://issues.apache.org/jira/browse/OAK-5192?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dürig updated OAK-5192:
-------------------------------
    Labels: perfomance scalability  (was: perfomance)

> 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
>              Labels: perfomance, scalability
>         Attachments: added-bytes-zoom.png
>
>
> 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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