title: There are 0 datanode(s) running and no node(s) are excluded in this operation (HDFS error)
body: <p>this error popped out after i tried to put a csv file in the folder ookla,does anyone have any idea why does this happened? I will really appreciate if someone can explain to me. I am quite new to hadoop.</p>
  
  <pre><code> [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.
  </code></pre>