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Date: Wed, 31 Jul 2013 19:07:50 +0000 (UTC)
From: "Benedict (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.12508186.1306243692622.146488.1375297670557@arcas>
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Subject: [jira] [Updated] (CASSANDRA-2698) Instrument repair to be able to
 assess it's efficiency (precision)
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     [ https://issues.apache.org/jira/browse/CASSANDRA-2698?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benedict updated CASSANDRA-2698:
--------------------------------

    Attachment: patch.taketwo.forreview.diff

against main trunk, as before
                
> 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, patch.taketwo.forreview.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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