Question

我尝试将文件从本地复制到 HDFS。使用命令 / / user / hduser / hadoop

中的hadoop dfs -copyFromLocal

显示以下错误消息。请帮助找到问题。

DEPRECATED：不建议使用此脚本执行hdfs命令。而是使用hdfs命令。

15/02/02 19:22:23 WARN hdfs.DFSClient: DataStreamer Exception
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /user/hduser/hadoop._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:1549)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3200)
    at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:641)
    at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:482)
    at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
    at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:619)
    at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:962)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2039)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2035)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:415)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2033)

    at org.apache.hadoop.ipc.Client.call(Client.java:1468)
    at org.apache.hadoop.ipc.Client.call(Client.java:1399)
    at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:232)
    at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
    at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:399)
    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:187)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
    at com.sun.proxy.$Proxy10.addBlock(Unknown Source)
    at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1532)
    at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1349)
    at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:588)
copyFromLocal: File /user/hduser/hadoop._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.

我的hdfs-site.xml

<property>
       <name>dfs.replication</name>
       <value>1</value>
     </property>
     <property>
       <name>dfs.namenode.name.dir</name>
       <value>file:/home/hduser/mydata/hdfs/namenode</value>
     </property>
     <property>
       <name>dfs.datanode.data.dir</name>
       <value>file:/home/hduser/mydata/hdfs/datanode</value>
     </property>

JPS

12805 NameNode
13276 ResourceManager
13398 NodeManager
13081 SecondaryNameNode
14129 Jps

Answer 1

以下步骤应解决此问题。 但是，您可能会丢失数据。

停止Hadoop：
- sbin / stop-dfs.sh
- sbin目录/ stop.yarn.sh
删除NameNode＆amp; DataNode：
- hdfs dfs -rm -r / mydata / hdfs / namenode
- hdfs dfs -rm -r / mydata / hdfs / datanodenode
格式化NameNode
- hdfs namenode -format
启动NameNode，Datanodes＆amp; YARN
- sbin目录/ start-dfs.sh
- sbin目录/ start-yarn.sh

Answer 2

我们可以看到您从jps中丢失了NameNode和DataNode 输出

首先在hadoop目录上停止hadoop

cd /usr/local/hadoop/sbin
stop-all.sh

然后删除NameNode和DataNode

的内容

rm -rf /usr/local/hadoop_store/hdfs/namenode/*
rm -rf /usr/local/hadoop_store/hdfs/datanode/*

格式NameNode

hadoop namenode -format

重新开始

start-all.sh

从本地文件复制文件到hdfs时出现错误消息

2 个答案: