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

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-1404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276218#comment-13276218 ] 

Jonathan Ellis commented on CASSANDRA-1404:
-------------------------------------------

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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