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https://issues.apache.org/jira/browse/OAK-5192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16044339#comment-16044339
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Tommaso Teofili edited comment on OAK-5192 at 6/15/17 12:17 PM:
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attaching a unit test for testing how different Lucene configurations impact on
segment store size.
The first thing that turns out is that the file store size is bigger with
_OakCodec_ than with _Lucene46_ codec: 149MB (Lucene46) vs 160MB (OakCodec).
I'm working with https://github.com/francescomari/oak-node-stats from [~frm] to
extract more stats and histograms.
was (Author: teofili):
attaching a unit test for testing how different Lucene configurations impact on
segment store size.
The first (strange) thing that turns out is that the file store size is bigger
with _OakCodec_ than with _Lucene46_ codec: 149MB (Lucene46) vs 160MB
(OakCodec).
I'm working with https://github.com/francescomari/oak-node-stats from [~frm] to
extract more stats and histograms.
> 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, 1.7.3
>
> 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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