本文主要是介绍Hadoop系列——异常处理（org.apache.hadoop.hdfs.DFSClient - DataStreamer Exception），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
报错：
WARN org.apache.hadoop.hdfs.DFSClient - DataStreamer Exception
org.apache.hadoop.ipc.RemoteException: File /user/erp_finance/erp_finance_dw/hdp/ods_third_party_zfb_bill_m/year=2019/month=12/1_128_2088021126134800_4_201912.csv 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:1625)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getNewBlockTargets(FSNamesystem.java:3132)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3056)at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:725)at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:493)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$1.run(Server.java:2217)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2213)at java.security.AccessController.doPrivileged(Native Method)at javax.security.auth.Subject.doAs(Subject.java:422)at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1758)at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2213)at org.apache.hadoop.ipc.Client.call(Client.java:1503)at org.apache.hadoop.ipc.Client.call(Client.java:1441)at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)at com.sun.proxy.$Proxy89.addBlock(Unknown Source)at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:422)at sun.reflect.GeneratedMethodAccessor104.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:253)at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:101)at com.sun.proxy.$Proxy90.addBlock(Unknown Source)at org.apache.hadoop.hdfs.DFSOutputStream$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)
15:35:36.808 [http-nio-8038-exec-2] ERROR com.didichuxing.erp.config.HadoopTemplate -
org.apache.hadoop.ipc.RemoteException: File /user/erp_finance/erp_finance_dw/hdp/ods_third_party_zfb_bill_m/year=2019/month=12/1_128_2088021126134800_4_201912.csv 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:1625)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getNewBlockTargets(FSNamesystem.java:3132)at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3056)at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:725)at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:493)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$1.run(Server.java:2217)at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2213)at java.security.AccessController.doPrivileged(Native Method)at javax.security.auth.Subject.doAs(Subject.java:422)at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1758)at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2213)at org.apache.hadoop.ipc.Client.call(Client.java:1503)at org.apache.hadoop.ipc.Client.call(Client.java:1441)at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)at com.sun.proxy.$Proxy89.addBlock(Unknown Source)at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:422)at sun.reflect.GeneratedMethodAccessor104.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:253)at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:101)at com.sun.proxy.$Proxy90.addBlock(Unknown Source)at org.apache.hadoop.hdfs.DFSOutputStream$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)原因：Hadoop启动异常
Lock on E:\hadoop\workspace\data\in_use.lock acquired by nodename 128564@DESKTOP-2SQ6CPU
20/01/03 15:43:02 WARN common.Storage: Failed to add storage directory [DISK]file:/E:/hadoop/workspace/data/
java.io.IOException: Incompatible clusterIDs in E:\hadoop\workspace\data: namenode clusterID = CID-72f16436-cb5a-4141-a652-f9b98bcd9390; datanode clusterID = CID-88794574-5883-4d1f-b482-7a0128ced467at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:777)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:1393)at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:1358)at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:313)at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:216)at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:637)at java.lang.Thread.run(Thread.java:748)
20/01/03 15:43:02 FATAL datanode.DataNode: Initialization failed for Block pool <registering> (Datanode Uuid unassigned) service to localhost/127.0.0.1:9000. 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:1393)at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:1358)at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:313)at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:216)at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:637)at java.lang.Thread.run(Thread.java:748)
20/01/03 15:43:02 WARN datanode.DataNode: Ending block pool service for: Block pool <registering> (Datanode Uuid unassigned) service to localhost/127.0.0.1:9000
20/01/03 15:43:02 INFO datanode.DataNode: Removed Block pool <registering> (Datanode Uuid unassigned)
20/01/03 15:43:04 WARN datanode.DataNode: Exiting Datanode
20/01/03 15:43:04 INFO util.ExitUtil: Exiting with status 0
20/01/03 15:43:04 INFO datanode.DataNode: SHUTDOWN_MSG:解决：
本地指定的workspace删掉，重新执行hdfs namenode -format，启动Hadoop
ps：
本地测试，数据随便删可以用这个方法，
Hadoop启动失败 可能原因：之前没有清本地workspace，直接执行hdfs namenode -format，后边选Y，后就这样了。
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