我不知道如何解决这个错误:
Vertex failed, vertexName=initialmap, vertexId=vertex_1449805139484_0001_1_00, diagnostics=[Task failed, taskId=task_1449805139484_0001_1_00_000003, diagnostics=[AttemptID:attempt_1449805139484_0001_1_00_000003_0 Info:Error: org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /user/hadoop/gridmix-kon/input/_temporary/1/_temporary/attempt_14498051394840_0001_m_000003_0/part-m-00003/segment-121 could only be replicated to 0 nodes instead of minReplication (=1). There are 4 datanode(s) running and no node(s) are excluded in this operation. at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget(BlockManager.java:1441) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2702) at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:584) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:440) at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java) at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585) at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2014) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2010) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1561) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2008) at org.apache.hadoop.ipc.Client.call(Client.java:1411) at org.apache.hadoop.ipc.Client.call(Client.java:1364) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206) at com.sun.proxy.$Proxy17.addBlock(Unknown Source) at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source) 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:190) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:103) at com.sun.proxy.$Proxy17.addBlock(Unknown Source) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:361) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1439) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1261) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:525)
知道是什么情况吗?
这个错误发生在BlockManager::chooseTarget4NewBlock()
(我指的是最新的代码)代码中.特定的代码片段,导致这是:
final DatanodeStorageInfo[] targets = blockplacement.chooseTarget(src, numOfReplicas, client, excludedNodes, blocksize, favoredDatanodeDescriptors, storagePolicy); if (targets.length < minReplication) { throw new IOException("File " + src + " could only be replicated to " + targets.length + " nodes instead of minReplication (=" + minReplication + "). There are " + getDatanodeManager().getNetworkTopology().getNumOfLeaves() + " datanode(s) running and " + (excludedNodes == null? "no": excludedNodes.size()) + " node(s) are excluded in this operation."); }
当BlockManager
尝试选择目标主机以存储新数据块而无法找到单个主机时,会发生这种情况(targets.length < minReplication)
.在文件中minReplication
设置为1(配置参数:).dfs.namenode.replication.min
hdfs-site.xml
这可能是由于以下原因之一:
数据节点实例未运行
数据节点实例无法联系名称节点
数据节点空间不足,因此不能为它们分配新的数据块
但是,在您的情况下,错误消息还包含以下信息:
There are 4 datanode(s) running and no node(s) are excluded in this operation.
这意味着,有4个数据节点正在运行,并且所有4个数据节点都被考虑用于此操作的数据放置.
因此,可能怀疑数据节点上的磁盘空间.您可以使用以下命令检查数据节点上的磁盘空间:
hdfs dfsadmin -report
它为每个实时数据节点提供报告.例如在我的情况下,我得到以下内容:
Live datanodes (1): Name: 192.168.56.1:50010 (192.168.56.1) Hostname: 192.168.56.1 Decommission Status : Normal Configured Capacity: 648690003968 (604.14 GB) DFS Used: 193849055737 (180.54 GB) Non DFS Used: 186164975111 (173.38 GB) DFS Remaining: 268675973120 (250.22 GB) DFS Used%: 29.88% DFS Remaining%: 41.42% Configured Cache Capacity: 0 (0 B) Cache Used: 0 (0 B) Cache Remaining: 0 (0 B) Cache Used%: 100.00% Cache Remaining%: 0.00% Xceivers: 1 Last contact: Sun Dec 13 17:17:34 IST 2015
检查" DFS-Remaining "和" DFS-Remaining% ".这应该可以让您了解数据节点上的剩余空间.
您还可以在这里参考维基:https://wiki.apache.org/hadoop/CouldOnlyBeReplicatedTo,它描述了此错误的原因以及缓解此错误的方法.