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https://issues.apache.org/jira/browse/CASSANDRA-1404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276218#comment-13276218
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Jonathan Ellis commented on CASSANDRA-1404:
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I think this makes the {{ / 2}} guess obsolete?
> 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
> Assignee: Yuki Morishita
> Priority: Minor
> Fix For: 1.1.1
>
> Attachments: 1404-1.1.txt
>
>
> 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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