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https://issues.apache.org/jira/browse/HDFS-14271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shen Yinjie updated HDFS-14271:
-------------------------------
    Assignee: Shen Yinjie
      Status: Patch Available  (was: Open)

Attach a simple fix for retry exception log 

> [SBN read] StandbyException is logged if Observer is the first NameNode
> -----------------------------------------------------------------------
>
>                 Key: HDFS-14271
>                 URL: https://issues.apache.org/jira/browse/HDFS-14271
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>    Affects Versions: 3.3.0
>            Reporter: Wei-Chiu Chuang
>            Assignee: Shen Yinjie
>            Priority: Minor
>         Attachments: HDFS-14271_1.patch
>
>
> 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:
> {noformat}
> [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.
> {noformat}
> This is unlike the case when the first NameNode is the Standby, where this 
> StandbyException is suppressed.



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