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Posted to commits@cassandra.apache.org by "Stu Hood (JIRA)" <ji...@apache.org> on 2011/04/01 20:21:06 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 ]

Stu Hood updated CASSANDRA-1404:
--------------------------------

    Priority: Major  (was: Minor)

Bumping this one: with 60% full nodes, it can become impossible to cleanup the largest sstable (256GB or so).

> 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
>
> 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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