[HBASE-19040] CP service exec broken for older clients after PB namespace addition

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Duplicate
• Component/s: Coprocessors, Protobufs
• Assignee: Unassigned
• Reporter: Josh Elser
• Created: 18/Oct/17 16:12
• Updated: 01/Jul/22 20:40
• Resolved: 18/Oct/17 18:29

Description

Was investigating an upgrade failure at dayjob. The "old" version did not include HBASE-14077 while the new version did include HBASE-14077.

After the servers have been upgraded, the clients which try to execute CP calls will begin to fail with a message such as:

$ hbase(main):001:0> user_permission
User                                                 Namespace,Table,Family,Qualifier:Permission

ERROR: org.apache.hadoop.hbase.exceptions.UnknownProtocolException: No registered coprocessor service found for name AccessControlService in region hbase:acl,,1508228211139.0ef76894681187f0ef958e78aed64d30.
	at org.apache.hadoop.hbase.regionserver.HRegion.execService(HRegion.java:7829)
	at org.apache.hadoop.hbase.regionserver.RSRpcServices.execServiceOnRegion(RSRpcServices.java:1980)
	at org.apache.hadoop.hbase.regionserver.RSRpcServices.execService(RSRpcServices.java:1962)
	at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32389)
	at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2150)
	at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:112)
	at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:187)
	at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:167)

The funny part is that the Region actually has a CP registered under the name hbase.pb.AccessControlService, but the client asks for one under AccessControlService.

I think the easy fix is to deploy the CP under both names while HBase services support client backwards compatibility with 1.x clients.

Issue Links

• duplicates: HBASE-15741 Provide backward compatibility for HBase coprocessor service names
• is broken by: HBASE-14077 Add package to hbase-protocol protobuf files.