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https://issues.apache.org/jira/browse/CASSANDRA-3530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157073#comment-13157073
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Hudson commented on CASSANDRA-3530:
-----------------------------------
Integrated in Cassandra-0.8 #404 (See
[https://builds.apache.org/job/Cassandra-0.8/404/])
avoid race in OutboundTcpConnection in multi-DC setups
patch by jbellis; reviewed by slebresne for CASSANDRA-3530
slebresne :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1206098
Files :
* /cassandra/branches/cassandra-0.8/CHANGES.txt
*
/cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/db/RowMutationVerbHandler.java
*
/cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/net/Header.java
*
/cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/net/Message.java
*
/cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/service/StorageProxy.java
> Header class not thread safe, but mutated by multiple threads
> -------------------------------------------------------------
>
> Key: CASSANDRA-3530
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3530
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 0.8.0
> Reporter: Sean Bridges
> Assignee: Jonathan Ellis
> Fix For: 0.8.8, 1.0.4
>
> Attachments: 3530-0.8.txt, 3530-v2.txt, CASSANDRA-3530.patch
>
>
> With Cassandra 1.0.3 we are getting exceptions like,
> Fatal exception in thread
> Thread[WRITE-/xx.xx.xx.xx,5,main]java.util.ConcurrentModificationException
>
> at java.util.Hashtable$Enumerator.next(Unknown Source)
> at org.apache.cassandra.net.Header.serializedSize(Header.java:97)
>
> at
> org.apache.cassandra.net.OutboundTcpConnection.messageLength(OutboundTcpConnection.java:164)
> at
> org.apache.cassandra.net.OutboundTcpConnection.write(OutboundTcpConnection.java:154)
>
> at
> org.apache.cassandra.net.OutboundTcpConnection.writeConnected(OutboundTcpConnection.java:115)
>
> at
> org.apache.cassandra.net.OutboundTcpConnection.run(OutboundTcpConnection.java:94)
> and,
> ERROR [WRITE-/xx.xx.xx.xx] 2011-11-24 22:08:28,981
> AbstractCassandraDaemon.java (line 133) Fatal exception in thread
> Thread[WRITE-/10.30.12.79,5,main]java.lang.NullPointerException
> at org.apache.cassandra.net.Header.serializedSize(Header.java:101)
> at
> org.apache.cassandra.net.OutboundTcpConnection.messageLength(OutboundTcpConnection.java:164)
> at
> org.apache.cassandra.net.OutboundTcpConnection.write(OutboundTcpConnection.java:154)
> at
> org.apache.cassandra.net.OutboundTcpConnection.writeConnected(OutboundTcpConnection.java:115)
>
> at
> org.apache.cassandra.net.OutboundTcpConnection.run(OutboundTcpConnection.java:94)
> It looks like Header is not thread safe, but the same header instance is
> modified concurrently while being sent to several threads in
> StorageProxy.sendMessages.
> This bug eventually causes the node to OOM, as it kills the
> OutboundTcpConnection thread, which means nothing is dequeing from queue.
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