FAQ
Hey,

Just upgrading distro from 4.2.1 to 4.4. Restarted namenodes and datanodes
and now seeing the exceptions below. Namenode has been in safe mode for an
hour now. Not sure if these are something I should be worried about?

On the namenode:

2013-10-18 23:41:20,138 WARN org.apache.hadoop.ipc.Server: Requested data
length 135758849 is longer than maximum configured RPC length 67108864.
RPC came from <ip>
2013-10-18 23:41:03,225 INFO org.apache.hadoop.ipc.Server: IPC Server
listener on 8020: readAndProcess threw exception java.io.IOException:
Requested data length 194413907 is longer than maximum configured RPC
length 67108864. RPC came from <ip> from client <ip>. Count of bytes read:

java.io.IOException: Requested data length 194413907 is longer than maximum
configured RPC length 67108864. RPC came from (Server.java:1341)
     at
org.apache.hadoop.ipc.Server$Connection.readAndProcess(Server.java:1439)
     at org.apache.hadoop.ipc.Server$Listener.doRead(Server.java:758)
     at
org.apache.hadoop.ipc.Server$Listener$Reader.doRunLoop(Server.java:557)
     at org.apache.hadoop.ipc.Server$Listener$Reader.run(Server.java:532)

On the datanodes:

2013-10-18 23:42:48,785 INFO org.apache.hadoop.util.JvmPauseMonitor:
Detected pause in JVM or host machine (eg GC): pause of approximately 1382ms
GC pool 'ParNew' had collection(s): count=1 time=1398ms
2013-10-18 23:42:49,995 WARN
org.apache.hadoop.hdfs.server.datanode.DataNode: IOException in offerService
java.io.IOException: Failed on local exception: java.io.IOException:
Response is null.; Host Details : local host is: "<domain>/<ip>";
destination host is: "(NetUtils.java:763)
     at org.apache.hadoop.ipc.Client.call(Client.java:1241)
     at
org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
     at $Proxy10.blockReport(Unknown Source)
     at sun.reflect.GeneratedMethodAccessor299.invoke(Unknown Source)
     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at
org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
     at
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
     at $Proxy10.blockReport(Unknown Source)
     at
org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.blockReport(DatanodeProtocolClientSideTranslatorPB.java:201)
     at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.blockReport(BPServiceActor.java:399)
     at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:551)
     at
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:673)
     at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.IOException: Response is null.
     at
org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:951)
     at org.apache.hadoop.ipc.Client$Connection.run(Client.java:846)

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postedOct 19, '13 at 4:45a
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