在日志中有一个异常，不知道是哪里有问题

2017-11-01 15:36:43,723 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: IOException in offerService
java.io.EOFException: End of File Exception between local host is: "hadoop1/192.168.1.56"; destination host is: "hadoop1":8020; : java.io.EOFException; For more details see:  http://wiki.apache.org/hadoop/EOFException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:791)
at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:764)
at org.apache.hadoop.ipc.Client.call(Client.java:1475)
at org.apache.hadoop.ipc.Client.call(Client.java:1408)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:230)
at com.sun.proxy.$Proxy13.sendHeartbeat(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.sendHeartbeat(DatanodeProtocolClientSideTranslatorPB.java:154)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.sendHeartBeat(BPServiceActor.java:557)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:660)
at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:851)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.EOFException
at java.io.DataInputStream.readInt(DataInputStream.java:392)
at org.apache.hadoop.ipc.Client$Connection.receiveRpcResponse(Client.java:1080)
at org.apache.hadoop.ipc.Client$Connection.run(Client.java:975)
2017-11-01 15:36:47,227 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: RECEIVED SIGNAL 15: SIGTERM
2017-11-01 15:36:47,229 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: