我正在尝试在我的本地机器上启动一个 hadoop 单节点集群。我根据https://amodernstory.com/2014/09/23/installing-hadoop-on-mac-osx-yosemite/配置了以下文件:hadoop-env.sh、core-site.xml、mapred-site.xml 和 hdfs-site.xml。当我运行脚本 start-dfs.sh 然后运行命令 jps(在运行 start-dfs.sh 之后)我看到数据节点已启动并正在运行:
15735 Jps
15548 DataNode
15660 SecondaryNameNode
15453 NameNode
几秒钟后，我重新运行命令 jps，我看到数据节点没有运行。为什么？如何解决？
之后，我运行脚本 start-yarn.sh，然后运行命令 jps。我看到了这个:
15955 NodeManager
16011 Jps
15660 SecondaryNameNode
15453 NameNode
15854 ResourceManager
我的最终目标是将文件从我的本地文件系统复制到 HDFS。为此，我运行命令 hdfs dfs -copyFromLocal/source-file-path/filename/destination-file-path/。我收到以下错误:
17/07/10 17:09:00 WARN hdfs.DataStreamer: DataStreamer Exception
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /pay/txnlinking/redshift.yml._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:1733)
at org.apache.hadoop.hdfs.server.namenode.FSDirWriteFileOp.chooseTargetForNewBlock(FSDirWriteFileOp.java:265)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2496)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:828)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:506)
at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:447)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:989)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:845)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:788)
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:1807)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2455)
at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1481)
at org.apache.hadoop.ipc.Client.call(Client.java:1427)
at org.apache.hadoop.ipc.Client.call(Client.java:1337)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:227)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
at com.sun.proxy.$Proxy10.addBlock(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:440)
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:398)
at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:163)
at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:155)
at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:335)
at com.sun.proxy.$Proxy11.addBlock(Unknown Source)
at org.apache.hadoop.hdfs.DataStreamer.locateFollowingBlock(DataStreamer.java:1733)
at org.apache.hadoop.hdfs.DataStreamer.nextBlockOutputStream(DataStreamer.java:1536)
at org.apache.hadoop.hdfs.DataStreamer.run(DataStreamer.java:658)
copyFromLocal: File /pay/txnlinking/redshift.yml._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.
如何避免上述错误并将文件复制到HDFS？
P.S:我在复制之前明确地在 HDFS 中创建了目标路径文件夹。
最佳答案
做
hadoop namenode -format
然后停止所有使用的服务
stop-all.sh
然后使用
重新启动所有服务start-all.sh
start-all.sh 和 stop-all.sh 已弃用，请改用 start-dfs.sh 和 stop-dfs.sh
关于hadoop - 如何将文件复制到HDFS？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45026884/