HDDS-10305. [DiskBalancer] Disk balancer command is not registered on datanode

[sodonnel]

What changes were proposed in this pull request?

When the datanode receives a disk balancer command, it logs an error indicating the command is not registered:

2024-02-06 13:57:20,690 [IPC Server handler 1 on default port 9861] WARN ipc.Server: IPC Server handler 1 on default port 9861, call Call#6 Retry#0 org.apache.hadoop.ozone.protocol.StorageContainerDatanodeProtocol.submitRequest from ozone_datanode_1.ozone_default:34310 / 192.168.48.4:34310
java.lang.IllegalArgumentException: Scm command diskBalancerCommand is not implemented
	at org.apache.hadoop.hdds.scm.server.SCMDatanodeProtocolServer.getCommandResponse(SCMDatanodeProtocolServer.java:413)
	at org.apache.hadoop.hdds.scm.server.SCMDatanodeProtocolServer.sendHeartbeat(SCMDatanodeProtocolServer.java:283)
	at org.apache.hadoop.ozone.protocolPB.StorageContainerDatanodeProtocolServerSideTranslatorPB.processMessage(StorageContainerDatanodeProtocolServerSideTranslatorPB.java:113)
	at org.apache.hadoop.hdds.server.OzoneProtocolMessageDispatcher.processRequest(OzoneProtocolMessageDispatcher.java:89)
	at org.apache.hadoop.ozone.protocolPB.StorageContainerDatanodeProtocolServerSideTranslatorPB.submitRequest(StorageContainerDatanodeProtocolServerSideTranslatorPB.java:92)
	at org.apache.hadoop.hdds.protocol.proto.StorageContainerDatanodeProtocolProtos$StorageContainerDatanodeProtocolService$2.callBlockingMethod(StorageContainerDatanodeProtocolProtos.java:47113)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server.processCall(ProtobufRpcEngine.java:484)
	at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:595)
	at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:573)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1227)
	at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1094)
	at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1017)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1899)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:3048)

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-10305

How was this patch tested?

Manually via docker compose

[Galsza]

Thank you Stephen, looks good to me

[symious]

LGTM.