Wei-Chiu Chuang created HDFS-14271:
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Summary: [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
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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