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https://issues.apache.org/jira/browse/CASSANDRA-1585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12922059#action_12922059
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Gary Dusbabek commented on CASSANDRA-1585:
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Deletion is a problem too.  The main problem is that there are 3 services that 
all aim to modify files: compaction, flushing and schema mutations.  Compaction 
and flushing are independent, but schema mutation isn't (we don't want to flush 
while files are being moved or deleted).

> Schema change with compaction race
> ----------------------------------
>
>                 Key: CASSANDRA-1585
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1585
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Stu Hood
>            Assignee: Gary Dusbabek
>            Priority: Minor
>             Fix For: 0.7.0
>
>
> We observed what appeared to be a race between an ongoing compaction and a 
> system_drop_cf call. The destination SSTable of the compaction was not 
> removed by the drop, so it remained in the data directory. Recreating a CF of 
> the same name caused the SSTable to become active again (or to at least show 
> in the gossiped load).

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