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  1. Hadoop HDFS
  2. HDFS-14271

[SBN read] StandbyException is logged if Observer is the first NameNode

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    Details

    • Type: Improvement
    • Status: Patch Available
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: 3.3.0
    • Fix Version/s: None
    • Component/s: hdfs
    • Labels:

      Description

      If I transition the first NameNode into Observer state, and then I create a file from command line, it prints the following StandbyException log message, as if the command failed. But it actually completed successfully:

      [root@weichiu-sbsr-1 ~]# hdfs dfs -touchz /tmp/abf
      19/02/12 16:35:17 INFO retry.RetryInvocationHandler: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category WRITE is not supported in state observer. Visit https://s.apache.org/sbnn-error
      	at org.apache.hadoop.hdfs.server.namenode.ha.StandbyState.checkOperation(StandbyState.java:98)
      	at org.apache.hadoop.hdfs.server.namenode.NameNode$NameNodeHAContext.checkOperation(NameNode.java:1987)
      	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkOperation(FSNamesystem.java:1424)
      	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.create(NameNodeRpcServer.java:762)
      	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.create(ClientNamenodeProtocolServerSideTranslatorPB.java:458)
      	at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
      	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:530)
      	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1070)
      	at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:918)
      	at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:853)
      	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:1729)
      	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2782)
      , while invoking $Proxy4.create over [weichiu-sbsr-1.gce.cloudera.com/172.31.121.145:8020,weichiu-sbsr-2.gce.cloudera.com/172.31.121.140:8020]. Trying to failover immediately.
      

      This is unlike the case when the first NameNode is the Standby, where this StandbyException is suppressed.

        Attachments

        1. HDFS-14271_1.patch
          1 kB
          Shen Yinjie

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              • Assignee:
                shenyinjie Shen Yinjie
                Reporter:
                weichiu Wei-Chiu Chuang
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                Dates

                • Created:
                  Updated: