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https://issues.apache.org/jira/browse/CASSANDRA-184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12710455#action_12710455
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Jonathan Ellis commented on CASSANDRA-184:
------------------------------------------
only one compaction can be in progress at a time, but flushes and compactions
can happen concurrently (different executors) so a thread flushing CF A can
schedule A for a compaction (i.e. submit the op on the MCM) even if A is
currently being compacted. the comment is explaining that when the MCM gets to
that redundant compact the impact will be minimal.
> intermittent OneCompactionTest failure
> --------------------------------------
>
> Key: CASSANDRA-184
> URL: https://issues.apache.org/jira/browse/CASSANDRA-184
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 0.3
> Reporter: Jonathan Ellis
> Attachments: 184-0.3.patch, 184-trunk.patch
>
>
> [junit] junit.framework.AssertionFailedError
>
> [junit] at org.apache.cassandra.io.SSTable.delete(SSTable.java:223)
>
> [junit] at
> org.apache.cassandra.db.ColumnFamilyStore.doFileCompaction(ColumnFamilyStore.java:1454)
> [junit] at
> org.apache.cassandra.db.ColumnFamilyStore.doCompaction(ColumnFamilyStore.java:896)
>
> [junit] at
> org.apache.cassandra.db.OneCompactionTest.testCompaction(OneCompactionTest.java:47)
>
> [junit] at
> org.apache.cassandra.db.OneCompactionTest.testCompaction2(OneCompactionTest.java:60)
>
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