could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running

主机报错：

[hadoop@Master files]$ hdfs dfs -put file3.txt /input

16/11/22 19:17:45 WARN hdfs.DFSClient: DataStreamer Exception

org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /input/file3.txt._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running and no node(s) are excluded in this operation.

at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1571)

at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getNewBlockTargets(FSNamesystem.java:3107)

at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3031)

at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:725)

at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:492)

at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)

at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)

at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:982)

at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049)

at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045)

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:1698)

at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2043)

at org.apache.hadoop.ipc.Client.call(Client.java:1475)

at org.apache.hadoop.ipc.Client.call(Client.java:1412)

at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)

at com.sun.proxy.$Proxy10.addBlock(Unknown Source)

at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:418)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:191)

at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)

at com.sun.proxy.$Proxy11.addBlock(Unknown Source)

at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1455)

at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1251)

at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:448)

put: File /input/file3.txt._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running and no node(s) are excluded in this operation.

[hadoop@Master files]$

查看从机的进程，显然DataNode没有起来：

[hadoop@Slave2 current]$ jps

25695 Jps

25579 NodeManager

查看从机的Log文件：

/home/hadoop/hadoop-2.7.3/logs/yarn-hadoop-nodemanager-Slave1.Hadoop.out

2016-11-22 16:54:25,391 WARN org.apache.hadoop.hdfs.server.common.Storage: Failed to add storage directory [DIS

K]file:/home/hadoop/hadoop-2.7.3/hdfs/data/

java.io.IOException: Incompatible clusterIDs in /home/hadoop/hadoop-2.7.3/hdfs/data: namenode clusterID = CID-9

f21d168-389b-4458-a33b-11077b1cdfa0; datanode clusterID = CID-9cc85f67-fd35-442c-9d75-1a76d3a182ec

at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:775)

at org.apache.hadoop.hdfs.server.datanode.DataStorage.loadStorageDirectory(DataStorage.java:300)

at org.apache.hadoop.hdfs.server.datanode.DataStorage.loadDataStorage(DataStorage.java:416)

at org.apache.hadoop.hdfs.server.datanode.DataStorage.addStorageLocations(DataStorage.java:395)

at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:573)

at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:1362)

at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:1327)

at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:

317)

at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:22

3)

at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:802)

at java.lang.Thread.run(Thread.java:745)

2016-11-22 16:54:25,398 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for Block

pool <registering> (Datanode Uuid unassigned) service to Master.hadoop/172.171.17.171:9000. Exiting.

java.io.IOException: All specified directories are failed to load.

at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:574)

at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:1362)

at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:1327)

at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:

317)

at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:22

3)

at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:802)

at java.lang.Thread.run(Thread.java:745)

2016-11-22 16:54:25,398 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Ending block pool service for: Bl

ock pool <registering> (Datanode Uuid unassigned) service to Master.hadoop/172.171.17.171:9000

2016-11-22 16:54:25,402 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Removed Block pool <registering>

(Datanode Uuid unassigned)

2016-11-22 16:54:27,404 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Exiting Datanode

2016-11-22 16:54:27,405 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 0

2016-11-22 16:54:27,406 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG:

/************************************************************

SHUTDOWN_MSG: Shutting down DataNode at Slave1.Hadoop/172.171.17.172

************************************************************/

原因分析：

多次格式化后 ./bin hdfs namenode -format，导致datanode启动不了

每次格式化，name下面的VERSION的clusterID会产生一个新的ID，要去修改各个节点的VERSION的clusterID

解决方法：

用namenode下面的 /home/hadoop/hadoop-2.7.3/dfs/name/current/VERSION文件里面的clusterID，修改datanode的/home/hadoop/hadoop-2.7.3/dfs/data/current/VERSION 文件里面里面的clusterID