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From "Jaeho Shin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GIRAPH-386) ClassCastException when giraph.SplitMasterWorker=false
Date Wed, 24 Oct 2012 23:32:12 GMT
Jaeho Shin created GIRAPH-386:
---------------------------------

             Summary: ClassCastException when giraph.SplitMasterWorker=false
                 Key: GIRAPH-386
                 URL: https://issues.apache.org/jira/browse/GIRAPH-386
             Project: Giraph
          Issue Type: Bug
            Reporter: Jaeho Shin


Using -Dgiraph.SplitMasterWorker=false with a recent trunk (r1401165) caused the machine who
is playing the master role (showing itself as {{ALL}} from the task tracker page) to throw
ClassCastException (SendVertexRequest -> MasterRequest) from MasterRequestServerHandler
class.  I'm trying to use as many machines as possible for actual computation (can't afford
to waste one for master+ZK).  This worked fine with r1388628 (roughly a month ago), so a recent
change must've broken something.  Here's the relevant log I captured:

{code}
2012-10-24 23:08:02,152 WARN org.apache.giraph.comm.netty.handler.RequestServerHandler: exceptionCaught:
Channel failed with remote address /10.x.y.z:41780
java.lang.ClassCastException: org.apache.giraph.comm.requests.SendVertexRequest cannot be
cast to org.apache.giraph.comm.requests.MasterRequest
	at org.apache.giraph.comm.netty.handler.MasterRequestServerHandler.processRequest(MasterRequestServerHandler.java:25)
	at org.apache.giraph.comm.netty.handler.RequestServerHandler.messageReceived(RequestServerHandler.java:100)
	at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
	at org.jboss.netty.handler.codec.oneone.OneToOneDecoder.handleUpstream(OneToOneDecoder.java:71)
	at org.jboss.netty.handler.execution.ChannelUpstreamEventRunnable.doRun(ChannelUpstreamEventRunnable.java:45)
	at org.jboss.netty.handler.execution.ChannelEventRunnable.run(ChannelEventRunnable.java:69)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
{code}

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