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18.7.2. State Receiver EOFExceptions

During a state transfer, if an EOFException is logged that states that the state receiver has Read past end of file, this can be dealt with depending on whether the state provider encounters an error when generating the state. For example, if the state provider is currently providing a state to a node, when another node requests a state, the state generator log can contain: 
2010-12-09 10:26:21,533 20267 ERROR [org.infinispan.remoting.transport.jgroups.JGroupsTransport] (STREAMING_STATE_TRANSFER-sender-1,Infinispan-Cluster,NodeJ-2368:) Caught while responding to state transfer request
org.infinispan.statetransfer.StateTransferException: java.util.concurrent.TimeoutException: Could not obtain exclusive processing lock
     at org.infinispan.statetransfer.StateTransferManagerImpl.generateState(StateTransferManagerImpl.java:175)
     at org.infinispan.remoting.InboundInvocationHandlerImpl.generateState(InboundInvocationHandlerImpl.java:119)
     at org.infinispan.remoting.transport.jgroups.JGroupsTransport.getState(JGroupsTransport.java:586)
     at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.handleUpEvent(MessageDispatcher.java:691)
     at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:772)
     at org.jgroups.JChannel.up(JChannel.java:1465)
     at org.jgroups.stack.ProtocolStack.up(ProtocolStack.java:954)
     at org.jgroups.protocols.pbcast.FLUSH.up(FLUSH.java:478)
     at org.jgroups.protocols.pbcast.STREAMING_STATE_TRANSFER$StateProviderHandler.process(STREAMING_STATE_TRANSFER.java:653)
     at org.jgroups.protocols.pbcast.STREAMING_STATE_TRANSFER$StateProviderThreadSpawner$1.run(STREAMING_STATE_TRANSFER.java:582)
     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
     at java.lang.Thread.run(Thread.java:680)
Caused by: java.util.concurrent.TimeoutException: Could not obtain exclusive processing lock
     at org.infinispan.remoting.transport.jgroups.JGroupsDistSync.acquireProcessingLock(JGroupsDistSync.java:71)
     at org.infinispan.statetransfer.StateTransferManagerImpl.generateTransactionLog(StateTransferManagerImpl.java:202)
     at org.infinispan.statetransfer.StateTransferManagerImpl.generateState(StateTransferManagerImpl.java:165)
     ... 12 more
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The implication of this exception is that the state generator was unable to generate the transaction log hence the output it was writing in now closed. In such a situation, the state receiver will often log an EOFException, displayed as follows, when failing to read the transaction log that was not written by the sender: 
2010-12-09 10:26:21,535 20269 TRACE [org.infinispan.marshall.VersionAwareMarshaller] (Incoming-2,Infinispan-Cluster,NodeI-38030:) Log exception reported
java.io.EOFException: Read past end of file
     at org.jboss.marshalling.AbstractUnmarshaller.eofOnRead(AbstractUnmarshaller.java:184)
     at org.jboss.marshalling.AbstractUnmarshaller.readUnsignedByteDirect(AbstractUnmarshaller.java:319)
     at org.jboss.marshalling.AbstractUnmarshaller.readUnsignedByte(AbstractUnmarshaller.java:280)
     at org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:207)
     at org.jboss.marshalling.AbstractUnmarshaller.readObject(AbstractUnmarshaller.java:85)
     at org.infinispan.marshall.jboss.GenericJBossMarshaller.objectFromObjectStream(GenericJBossMarshaller.java:175)
     at org.infinispan.marshall.VersionAwareMarshaller.objectFromObjectStream(VersionAwareMarshaller.java:184)
     at org.infinispan.statetransfer.StateTransferManagerImpl.processCommitLog(StateTransferManagerImpl.java:228)
     at org.infinispan.statetransfer.StateTransferManagerImpl.applyTransactionLog(StateTransferManagerImpl.java:250)
     at org.infinispan.statetransfer.StateTransferManagerImpl.applyState(StateTransferManagerImpl.java:320)
     at org.infinispan.remoting.InboundInvocationHandlerImpl.applyState(InboundInvocationHandlerImpl.java:102)
     at org.infinispan.remoting.transport.jgroups.JGroupsTransport.setState(JGroupsTransport.java:603)
        ...
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When this error occurs, the state receiver attempts the operation every few seconds until it is successful. In most cases, after the first attempt, the state generator has already finished processing the second node and is fully receptive to the state, as expected.
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