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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