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https://issues.apache.org/jira/browse/CASSANDRA-2698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13689854#comment-13689854
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Benedict commented on CASSANDRA-2698:
-------------------------------------
Just noticed that patch doesn't include the HistogramBuilder class - after I
posted I noticed I needed to pull in the latest remote changes, which
unfortunately use 1.7 syntax, and since I'm on an old eclipse my problems
window exploded. It's late here so I didn't/don't want to faff around too much,
but if you have trouble let me know and I'll upload another patch after
upgrading eclipse. The patch uploaded should be easy to quickly scan with my
description to let me know if I'm still barking up the wrong tree, or if there
are any changes you disagree with in principle.
> 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, patch.taketwo.alpha.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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