org.apache.hadoop.ipc.RemoteException(java.io.IOException)

昨晚突然之間mr跑步起來了
jps查看 進程都在的，但是在reduce任務跑了85%的時候會拋異常
異常情況如下：

2016-09-21 21:32:28,538 INFO [org.apache.hadoop.mapreduce.Job] -  map 100% reduce 84%
2016-09-21 21:32:30,623 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:32:33,626 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:32:36,627 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:32:39,628 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:32:42,630 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:32:45,632 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:32:48,634 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:32:51,634 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:32:54,636 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:32:57,638 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:33:00,639 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:33:03,641 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:33:04,554 INFO [org.apache.hadoop.mapreduce.Job] -  map 100% reduce 85%
2016-09-21 21:33:06,643 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:33:09,644 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:33:12,645 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:33:15,648 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:33:18,650 INFO [org.apache.hadoop.mapred.LocalJobRunner] - reduce > reduce
2016-09-21 21:33:19,268 WARN [org.apache.hadoop.hdfs.DFSClient] - DataStreamer Exception
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /anagram/out/_temporary/0/_temporary/attempt_local946954997_0001_r_000000_0/part-r-00000
 could only be replicated to 0 nodes instead of minReplication (=1).  There are 1 datanode(s) running and no node(s) are excluded in this operation.
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget(BlockManager.java:1384)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2477)
	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:555)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:387)
	at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:59582)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2048)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2044)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2042)

	at org.apache.hadoop.ipc.Client.call(Client.java:1347)
	at org.apache.hadoop.ipc.Client.call(Client.java:1300)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
	at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:186)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
	at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:330)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1226)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1078)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
2016-09-21 21:33:19,330 WARN [org.apache.hadoop.mapred.LocalJobRunner] - job_local946954997_0001
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /anagram/out/_temporary/0/_temporary/attempt_local946954997_0001_r_000000_0/part-r-00000 could only be replicated to 0 nodes instead of minReplication (=1).  There are 1 datanode(s) running and no node(s) are excluded in this operation.
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget(BlockManager.java:1384)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2477)
	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:555)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:387)
	at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:59582)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2048)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2044)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1491)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2042)

	at org.apache.hadoop.ipc.Client.call(Client.java:1347)
	at org.apache.hadoop.ipc.Client.call(Client.java:1300)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
	at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:186)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
	at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:330)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1226)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1078)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
2016-09-21 21:33:19,560 INFO [org.apache.hadoop.mapreduce.Job] - Job job_local946954997_0001 failed with state F

看到這里以為是副本問題

could only be replicated to 0 nodes instead of minReplication (=1). 

隨后把副本改為三個還是出現此異常。然后把集群從啟一下發現datanode沒有能夠啟動
后面查看日志發現datanode啟動異常

java.io.IOException: Incompatible clusterIDs in /data/dfs/data: namenode clusterID = CID-70f4fcbc-13a2-4918-a90a-5a7b4b47baa8; datanode clusterID = CID-be72a034-047f-4d49-bb40-dd411b8007e6
	at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:391)
	at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:191)
	at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:219)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:837)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:808)
	at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:280)
	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:222)
	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
	at java.lang.Thread.run(Thread.java:745)
2016-09-21 15:57:22,786 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Ending block pool service for: Block pool BP-1394444749-192.168.19.130-1474417014093 (storage id DS-433243534-192.168.19.130-50010-1473626296058) service to selfimpr/192.168.19.130:9000
2016-09-21 15:57:22,938 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Removed Block pool BP-1394444749-192.168.19.130-1474417014093 (storage id DS-433243534-192.168.19.130-50010-1473626296058)
2016-09-21 15:57:24,939 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Exiting Datanode
2016-09-21 15:57:24,940 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 0

隨后手動把namenode和datanode 的clusterID 統一了，后面集群啟動成功，但是程序異常依舊，最后把namenode和datanode統一格式化，程序正常運行。

參考：
http://stackoverflow.com/questions/15571584/writing-to-hdfs-could-only-be-replicated-to-0-nodes-instead-of-minreplication

https://issues.apache.org/jira/browse/HDFS-107