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From "Ivan Sobolev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2698) Instrument repair to be able to assess it's efficiency (precision)
Date Mon, 11 Feb 2013 17:39:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13575928#comment-13575928
] 

Ivan Sobolev commented on CASSANDRA-2698:
-----------------------------------------

Hi, guys, it appears, the thing would be useful for me too. I'm going to give it a try. I'll
follow the plan summarized by [~jbellis].
If you feel that I should know something you know - please shout :)
                
> 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
>            Priority: Minor
>              Labels: lhf
>         Attachments: nodetool_repair_and_cfhistogram.tar.gz
>
>
> 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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