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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2011/08/12 23:23:28 UTC

[jira] [Updated] (CASSANDRA-2698) Instrument repair to be able to assess it's efficiency (precision)

     [ https://issues.apache.org/jira/browse/CASSANDRA-2698?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-2698:
--------------------------------------

    Assignee:     (was: Sylvain Lebresne)
      Labels: lhf  (was: )

Would an EstimatedHistogram for the entire tree be good enough or do you want to actually log which ranges had which key counts?

> 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
>
> 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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