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https://issues.apache.org/jira/browse/CASSANDRA-6948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13950721#comment-13950721
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Martin Meyer commented on CASSANDRA-6948:
-----------------------------------------
I've seen this exception in my own logs, and it seems to somehow degrade the
performance of the node (their writes/sec drops precipitously after the event
starts compared to others in the cluster). Restarting seems to make them behave
normally again.
Since this seems to be a result of an update attempt, this begs the question of
whether my data is likely to have been written or not. Any idea if it is, or if
they are being lost? Is there any way of knowing what exactly that callback is
doing? I don't think it's a callback I have attached, so I assume it's
something internal to Cassandra..?
> Native & ReplicateOnWriteStage AssertionError: Callback already exists
> ----------------------------------------------------------------------
>
> Key: CASSANDRA-6948
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6948
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Keith Wright
>
> We are using the datastax driver and have seen the following exceptions
> appear periodically in our cluster in "groups". The client will gradually
> start sending less write requests to the nodes where this occurs the most
> often. This may be related to CASSANDRA-6476. Exception from logs:
> ERROR [Native-Transport-Requests:7636] 2014-03-28 13:32:10,638
> ErrorMessage.java (line 222) Unexpected exception during request
> java.lang.AssertionError: Callback already exists for id -1665979622!
> (CallbackInfo(target=/10.106.160.84,
> callback=org.apache.cassandra.service.WriteResponseHandler@5d36d8ea,
> serializer=org.apache.cassandra.db.WriteResponse$WriteResponseSerializer@6ed37f0b))
> at
> org.apache.cassandra.net.MessagingService.addCallback(MessagingService.java:549)
> at
> org.apache.cassandra.net.MessagingService.sendRR(MessagingService.java:601)
> at
> org.apache.cassandra.service.StorageProxy.mutateCounter(StorageProxy.java:984)
> at
> org.apache.cassandra.service.StorageProxy.mutate(StorageProxy.java:449)
> at
> org.apache.cassandra.service.StorageProxy.mutateWithTriggers(StorageProxy.java:524)
> at
> org.apache.cassandra.cql3.statements.ModificationStatement.executeWithoutCondition(ModificationStatement.java:521)
> at
> org.apache.cassandra.cql3.statements.ModificationStatement.execute(ModificationStatement.java:505)
> at
> org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:188)
> at
> org.apache.cassandra.cql3.QueryProcessor.processPrepared(QueryProcessor.java:358)
> at
> org.apache.cassandra.transport.messages.ExecuteMessage.execute(ExecuteMessage.java:131)
> at
> org.apache.cassandra.transport.Message$Dispatcher.messageReceived(Message.java:304)
> at
> org.jboss.netty.handler.execution.ChannelUpstreamEventRunnable.doRun(ChannelUpstreamEventRunnable.java:43)
> at
> org.jboss.netty.handler.execution.ChannelEventRunnable.run(ChannelEventRunnable.java:67)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:744)
> ERROR [ReplicateOnWriteStage:102766] 2014-03-28 13:32:10,638
> CassandraDaemon.java (line 196) Exception in thread
> Thread[ReplicateOnWriteStage:102766,5,main]
> java.lang.AssertionError: Callback already exists for id -1665979620!
> (CallbackInfo(target=/10.106.160.84,
> callback=org.apache.cassandra.service.WriteResponseHandler@3bdb1a75,
> serializer=org.apache.cassandra.db.WriteResponse$WriteResponseSerializer@6ed37f0b))
> at
> org.apache.cassandra.net.MessagingService.addCallback(MessagingService.java:549)
> at
> org.apache.cassandra.net.MessagingService.sendRR(MessagingService.java:601)
> at
> org.apache.cassandra.service.StorageProxy.sendToHintedEndpoints(StorageProxy.java:806)
> at
> org.apache.cassandra.service.StorageProxy$8$1.runMayThrow(StorageProxy.java:1074)
> at
> org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:1896)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:744)
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