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https://issues.apache.org/jira/browse/OAK-5192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16072562#comment-16072562
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Tommaso Teofili edited comment on OAK-5192 at 7/3/17 2:57 PM:
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I've added a multiplier parameter so that the _add, reindex, add/delete_
workflow can be executed multiple times and see how the index grows over time
using different configurations.
See the attached graph
https://issues.apache.org/jira/secure/attachment/12875524/Screen%20Shot%202017-07-03%20at%2016.50.00.png.
After ten runs these are the respective sizes (using default MergePolicy):
||Codec||Size||
|oakCodec|5700 MB|
|Lucene46|5300 MB|
|customCodec|5000 MB|
I didn't measure time taken to perform the tests, which instead needs to be
tracked to make sure indexing speed doesn't degrade as we increase space
efficiency.
was (Author: teofili):
I've added a multiplier parameter so that the _add, reindex, add/delete_
workflow can be executed multiple times and see how the index grows over time
using different configurations.
See the attached graph
https://issues.apache.org/jira/secure/attachment/12875524/Screen%20Shot%202017-07-03%20at%2016.50.00.png.
After ten runs these are the respective sizes:
||Codec||Size||
|oakCodec|5700 MB|
|Lucene46|5300 MB|
|customCodec|5000 MB|
I didn't measure time taken to perform the tests, which instead needs to be
tracked to make sure indexing speed doesn't degrade as we increase space
efficiency.
> 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, Screen
> Shot 2017-07-03 at 16.50.00.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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