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https://issues.apache.org/jira/browse/CASSANDRA-2698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13626208#comment-13626208
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Yuki Morishita commented on CASSANDRA-2698:
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[~benedict]
hmm, it is not clear to me why you create EstimatedHistogram of size of
differences. Sometimes I see more than 1000 of differences for large clusters.
You should just create it with reasonable bucket count. You don't have to keep
every size for every range.
Using logging for outputting statistic is fine at this point, but I think we
should come up with other way so that it is easy to see all the related logs
and statistics about certain repair session. I don't have specific idea yet
though. (Maybe another system cf similar to Tracing?)
nits:
- fix coding style (especially whitespace) to match other code.
- EstimatedHistogram#testGroupBy is failing.
- comparator in Arrays#sort in EstimatedHistogram#logSummary has the same
conditions in both if and else if.
> Instrument repair to be able to assess it's efficiency (precision)
> ------------------------------------------------------------------
>
> Key: CASSANDRA-2698
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2698
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Sylvain Lebresne
> Assignee: Benedict
> Priority: Minor
> Labels: lhf
> Attachments: nodetool_repair_and_cfhistogram.tar.gz,
> patch_2698_v1.txt, patch.diff, patch-rebased.diff
>
>
> Some reports indicate that repair sometime transfer huge amounts of data. One
> hypothesis is that the merkle tree precision may deteriorate too much at some
> data size. To check this hypothesis, it would be reasonably to gather
> statistic during the merkle tree building of how many rows each merkle tree
> range account for (and the size that this represent). It is probably an
> interesting statistic to have anyway.
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