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https://issues.apache.org/jira/browse/CASSANDRA-3087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13094705#comment-13094705
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Hudson commented on CASSANDRA-3087:
-----------------------------------
Integrated in Cassandra #1061 (See
[https://builds.apache.org/job/Cassandra/1061/])
fix race that allowed multiple simultaneous leveled compaction tasks
patch by jbellis; reviewed by Ben Coverston for CASSANDRA-3087
jbellis :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1163688
Files :
* /cassandra/trunk/CHANGES.txt
*
/cassandra/trunk/src/java/org/apache/cassandra/db/compaction/CompactionManager.java
*
/cassandra/trunk/src/java/org/apache/cassandra/db/compaction/LeveledCompactionStrategy.java
*
/cassandra/trunk/src/java/org/apache/cassandra/db/compaction/LeveledCompactionTask.java
> Leveled compaction allows multiple simultaneous compaction Tasks
> ----------------------------------------------------------------
>
> Key: CASSANDRA-3087
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3087
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 1.0
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Fix For: 1.0
>
> Attachments: 3087-v2.txt, 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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