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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-3087) Leveled compaction allows multiple simultaneous compaction Tasks
Date Fri, 26 Aug 2011 22:55:30 GMT
Leveled compaction allows multiple simultaneous compaction Tasks
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                 Key: CASSANDRA-3087
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3087
             Project: Cassandra
          Issue Type: Bug
            Reporter: Jonathan Ellis
            Assignee: Jonathan Ellis


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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