Getting Info message while reading and writing message in HDFS

[#1]

I am getting info messages like the one below while reading and writing files in hdfs.

can anyone explain the meaning of this message, will it cause any issues? I have 3 Namenode(open-source Hadoop) in HA.

INFO retry.RetryInvocationHandler: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category READ is not supported in state standby. Visit https://s.apache.org/sbnn-error
at org.apache.hadoop.hdfs.server.namenode.ha.StandbyState.checkOperation(StandbyState.java:108)
at org.apache.hadoop.hdfs.server.namenode.NameNode$NameNodeHAContext.checkOperation(NameNode.java:2094)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkOperation(FSNamesystem.java:1550)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getFileInfo(FSNamesystem.java:3342)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getFileInfo(NameNodeRpcServer.java:1208)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getFileInfo(ClientNamenodeProtocolServerSideTranslatorPB.java:1042)
at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:604)
at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:572)
at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:556)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1093)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1043)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:971)
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:1878)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2976)
, while invoking ClientNamenodeProtocolTranslatorPB.getFileInfo over hostname/ip:8020 after 1 failover attempts. Trying to failover after sleeping for 1195ms.

Thanks

[#2 · Accepted solution]

Hello @KPG1 ,

If you are able to successfully read/write from HDFS and if these messages are appearing only on standby NN logs, then it should be normal. 

Thank you.