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From "Jason Wee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2698) Instrument repair to be able to assess it's efficiency (precision)
Date Wed, 04 Jul 2012 14:24:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406548#comment-13406548
] 

Jason Wee commented on CASSANDRA-2698:
--------------------------------------

Hello Jonathan, I read through this ticket and trying to understand the context. Unfortunately,
at this stage, I am clueless where to start. However, attach is the output of nodetool repair
and nodetool cfhistogram which may help in this ticket context imo. Please let me know if
the attachment helps or I should probably go to trivial bug first so that I can have more
time to understand the code as well as the development culture and procedures here. 
                
> 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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