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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2011/01/04 15:17:45 UTC

[jira] Updated: (CASSANDRA-1404) Improve pre-cleanup estimate of disk space required

     [ https://issues.apache.org/jira/browse/CASSANDRA-1404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-1404:
--------------------------------------

    Summary: Improve pre-cleanup estimate of disk space required  (was: Allow 'nodetool cleanup' to run when disk is more than 50% full)

> Improve pre-cleanup estimate of disk space required
> ---------------------------------------------------
>
>                 Key: CASSANDRA-1404
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1404
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Stu Hood
>            Priority: Minor
>             Fix For: 0.7.1
>
>
> Compaction sums the sizes of all ranges to estimate the output size in order to pick a target drive. Anti-compactions directly drop ranges from sstables, and the volume of data dropped can easily be calculated using the SSTable index. Using this knowledge in our estimate in ColumnFamilyStore.getExpectedCompactedFileSize would allow 'nodetool cleanup' to run when less than 50% of disk is available, in the case where ranges are being dropped (post node-move).

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