Getting Info message while reading and writing message in HDFS

KPG1 — Mon, 28 Nov 2022 05:52:10 GMT

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

Re: Getting Info message while reading and writing message in HDFS

pajoshi — Mon, 28 Nov 2022 20:10:47 GMT

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.

question Getting Info message while reading and writing message in HDFS in Support Questions

Getting Info message while reading and writing message in HDFS

Re: Getting Info message while reading and writing message in HDFS