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https://issues.apache.org/jira/browse/CASSANDRA-3087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-3087:
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Attachment: 3087.txt
Fix makes getBT wait for the current Task in that CF, if any, before returning
a new one.
> Leveled compaction allows multiple simultaneous compaction Tasks
> ----------------------------------------------------------------
>
> Key: CASSANDRA-3087
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3087
> Project: Cassandra
> Issue Type: Bug
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Attachments: 3087.txt
>
>
> CASSANDRA-1608 attempts to restrict itself to one compaction task per CF (see
> discussion there for why this is necessary) by synchronizing
> LCS.getBackgroundTasks but this is not sufficient. Consider this sequence of
> events:
> 1. getBackgroundTasks returns a Task for compacting some L0 sstables. this
> Task is scheduled.
> 2. Another SSTable for this CF is flushed, so
> CompactionManager.submitBackground is called. getBT is not currently
> in-progress so the synchronization does not stop another Task from being
> returned and scheduled.
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