Benedict updated CASSANDRA-2698:

    Attachment: patch-rebased.diff
> 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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