[HDFS-5555] CacheAdmin commands fail when first listed NameNode is in Standby

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1
• Fix Version/s: 2.3.0
• Component/s: caching
• Assignee: Jimmy Xiang
• Reporter: Stephen Chu
• Created: 22/Nov/13 19:25
• Updated: 12/May/16 18:17
• Resolved: 04/Dec/13 20:06

Description

I am on a HA-enabled cluster. The NameNodes are on host-1 and host-2.

In the configurations, we specify the host-1 NN first and the host-2 NN afterwards in the dfs.ha.namenodes.ns1 property (where ns1 is the name of the nameservice).

If the host-1 NN is Standby and the host-2 NN is Active, some CacheAdmins will fail complaining about operation not supported in standby state.

e.g.

bash-4.1$ hdfs cacheadmin -removeDirectives -path /user/hdfs2
Exception in thread "main" org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category READ is not supported in state standby
	at org.apache.hadoop.hdfs.server.namenode.ha.StandbyState.checkOperation(StandbyState.java:87)
	at org.apache.hadoop.hdfs.server.namenode.NameNode$NameNodeHAContext.checkOperation(NameNode.java:1501)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkOperation(FSNamesystem.java:1082)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.listCacheDirectives(FSNamesystem.java:6892)
	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer$ServerSideCacheEntriesIterator.makeRequest(NameNodeRpcServer.java:1263)
	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer$ServerSideCacheEntriesIterator.makeRequest(NameNodeRpcServer.java:1249)
	at org.apache.hadoop.fs.BatchedRemoteIterator.makeRequest(BatchedRemoteIterator.java:77)
	at org.apache.hadoop.fs.BatchedRemoteIterator.makeRequestIfNeeded(BatchedRemoteIterator.java:85)
	at org.apache.hadoop.fs.BatchedRemoteIterator.hasNext(BatchedRemoteIterator.java:99)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.listCacheDirectives(ClientNamenodeProtocolServerSideTranslatorPB.java:1087)
	at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1026)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:415)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1499)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2043)

	at org.apache.hadoop.ipc.Client.call(Client.java:1348)
	at org.apache.hadoop.ipc.Client.call(Client.java:1301)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
	at com.sun.proxy.$Proxy9.listCacheDirectives(Unknown Source)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB$CacheEntriesIterator.makeRequest(ClientNamenodeProtocolTranslatorPB.java:1079)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB$CacheEntriesIterator.makeRequest(ClientNamenodeProtocolTranslatorPB.java:1064)
	at org.apache.hadoop.fs.BatchedRemoteIterator.makeRequest(BatchedRemoteIterator.java:77)
	at org.apache.hadoop.fs.BatchedRemoteIterator.makeRequestIfNeeded(BatchedRemoteIterator.java:85)
	at org.apache.hadoop.fs.BatchedRemoteIterator.hasNext(BatchedRemoteIterator.java:99)
	at org.apache.hadoop.hdfs.DistributedFileSystem$32.hasNext(DistributedFileSystem.java:1704)
	at org.apache.hadoop.hdfs.tools.CacheAdmin$RemoveCacheDirectiveInfosCommand.run(CacheAdmin.java:372)
	at org.apache.hadoop.hdfs.tools.CacheAdmin.run(CacheAdmin.java:84)
	at org.apache.hadoop.hdfs.tools.CacheAdmin.main(CacheAdmin.java:89)

After manually failing over from host-2 to host-1, the CacheAdmin commands succeed.

The affected commands are:

-listPools
-listDirectives
-removeDirectives

Issue Links

• is duplicated by: HDFS-5573 CacheAdmin doesn't work