Hadoop 有0个datanode正在运行，并且在此操作中没有排除任何节点（HDFS错误）

这个错误是在我试图将csv文件放入ookla文件夹后出现的，有人知道为什么会发生这种情况吗？如果有人能向我解释，我将不胜感激。我是hadoop的新手

 [hadoop_@master ~]$ hdfs dfs -put Ookla_ZTE.csv /ookla
 17/03/24 15:29:52 WARN hdfs.DFSClient: DataStreamer Exception
 org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /ookla/Ookla_ZTE.csv._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$1.run(Server.java:2045)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:422)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1698)
    at org.apache.hadoop.ipc.Server$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:62)
    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: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 /ookla/Ookla_ZTE.csv._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.

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您的数据节点未运行。检查datanode日志。当我检查日志时，它显示它正在运行，例如：hadoop-hadoop\uu-datanode-master.out.11436 Mar 27 08:50 hadoop-hadoop\uo-datanode-master.out.2等等，我可以知道这是否正确吗@franklinsijoNot

.out

文件，查找

.log

文件。-rw-rw-r--。1 hadoopuser hadoopuser 29058 Mar 27 16:00 hadoop-hadoopuser-datanode-master.log-rw-rw-r--。1 hadoopuser hadoopuser 1442 Mar 27 16:00 hadoop-hadoopuser-datanode-master.out-rw-rw-r--。1 hadoopuser hadoopuser 27625 Mar 27 16:03 hadoop-hadoopuser-namenode-master.log-rw-rw-r--。1 hadoopuser hadoopuser 721 Mar 27 16:00 hadoop-hadoopuser-namenode-master.out-rw-rw-r--。1 hadoopuser hadoopuser 21999年3月27日16:01 hadoop-hadoopuser-secondarynamenode-master.log-rw-rw-r--。1 hadoopuser hadoopuser 721 Mar 27 16:00 hadoop-hadoopuser-secondarynamenode-master.out这些是您的日志文件，获取最新的datanode日志文件

hadoop hadoopuser datanode master.log

并检查其中是否存在

错误。