[ https://issues.apache.org/jira/browse/HDFS-14271 ]
tomscut deleted comment on HDFS-14271:
--------------------------------
was (Author: tomscut):
Perhaps the client needs to make a cache, such as a map, to record the state of
each Namenode.
Send the request to the corresponding state of the Namenode every time.
When ObserverRetryOnActiveException or StandbyException occur, updating cache
state of the corresponding Namenode.
> [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
> Labels: multi-sbnn
> Attachments: HDFS-14271_1.patch, image-2022-03-11-14-54-49-806.png
>
>
> 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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