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Posted to commits@cassandra.apache.org by "Jonathan Ellis (Commented) (JIRA)" <ji...@apache.org> on 2011/11/25 04:38:41 UTC
[jira] [Commented] (CASSANDRA-3530) Header class not thread safe,
but mutated by multiple threads
[ https://issues.apache.org/jira/browse/CASSANDRA-3530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156972#comment-13156972 ]
Jonathan Ellis commented on CASSANDRA-3530:
-------------------------------------------
Are you running in a multi-DC environment?
> 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: 1.0.3
> Reporter: Sean Bridges
> Attachments: 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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