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https://issues.apache.org/jira/browse/CASSANDRA-320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12736651#action_12736651
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Brandon Williams commented on CASSANDRA-320:
--------------------------------------------
+1
I'm no longer able to reproduce the issue with this patch after many millions
of sustained inserts.
> Memtable sometimes not enqueued for flush
> -----------------------------------------
>
> Key: CASSANDRA-320
> URL: https://issues.apache.org/jira/browse/CASSANDRA-320
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Debian lenny amd64 sun jdk 1.6
> Reporter: Brandon Williams
> Attachments: 320.patch
>
>
> There appears to be a (rare) race condition with flushing memtables.
> Occasionally, when Cassandra is in the process of flushing a table, another
> switch will occur. The latter table will be added to memtablesPendingFlush
> in ColumnFamilyStore, but it will not be enqueued for flush and thus hang
> around forever. Adding an else clause and a print statement to
> Memtable.java's enqueueFlush method reveals that the memtable is not being
> flushed because isFrozen_ is already true.
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