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https://issues.apache.org/jira/browse/CASSANDRA-3547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161186#comment-13161186
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Jonathan Ellis commented on CASSANDRA-3547:
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+1, and I think we do need this for 0.8 as well
> Race between cf flush and its secondary indexes flush
> -------------------------------------------------------
>
> Key: CASSANDRA-3547
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3547
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.8.0
> Reporter: Sylvain Lebresne
> Assignee: Sylvain Lebresne
> Fix For: 0.8.9, 1.0.6
>
> Attachments: 3547.patch
>
>
> When a CF with indexes is flushed, it's indexes are flushed too. In
> particular their memtable is switched, but without making the old memtable
> frozen. This can conflict with a concurrent flush of the index itself, as
> reported on the user list by Michael Vaknine:
> {noformat}
> TST-Cass2 ERROR [Thread-58] 2011-11-30 20:40:17,449
> AbstractCassandraDaemon.java (line 133) Fatal exception in thread Thread
> TST-Cass2 ERROR [Thread-58] 2011-11-30 20:40:17,449 java.lang.AssertionError
> TST-Cass2 ERROR [Thread-58] 2011-11-30 20:40:17,449 at
> org.apache.cassandra.db.ColumnFamilyStore.maybeSwitchMemtable(ColumnFamilyStore.java:671)
> TST-Cass2 ERROR [Thread-58] 2011-11-30 20:40:17,449 at
> org.apache.cassandra.db.ColumnFamilyStore.forceFlush(ColumnFamilyStore.java:745)
> TST-Cass2 ERROR [Thread-58] 2011-11-30 20:40:17,449 at
> org.apache.cassandra.db.ColumnFamilyStore.forceBlockingFlush(ColumnFamilyStore.java:750)
> TST-Cass2 ERROR [Thread-58] 2011-11-30 20:40:17,449 at
> org.apache.cassandra.db.index.keys.KeysIndex.forceBlockingFlush(KeysIndex.java:119)
> TST-Cass2 ERROR [Thread-58] 2011-11-30 20:40:17,449 at
> org.apache.cassandra.db.index.SecondaryIndexManager.flushIndexesBlocking(SecondaryIndexManager.java:258)
> TST-Cass2 ERROR [Thread-58] 2011-11-30 20:40:17,449 at
> org.apache.cassandra.db.index.SecondaryIndexManager.maybeBuildSecondaryIndexes(SecondaryIndexManager.java:123)
> TST-Cass2 ERROR [Thread-58] 2011-11-30 20:40:17,449 at
> org.apache.cassandra.streaming.StreamInSession.closeIfFinished(StreamInSession.java:151)
> {noformat}
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