[jira] [Created] (HBASE-20927) RSGroupAdminEndpoint doesn't handle clearing dead servers if they are not processed yet.

["Sergey Soldatov (JIRA)" <ji...@apache.org>]

Sergey Soldatov created HBASE-20927:
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             Summary: RSGroupAdminEndpoint doesn't handle clearing dead servers if they are not processed yet.
                 Key: HBASE-20927
                 URL: https://issues.apache.org/jira/browse/HBASE-20927
             Project: HBase
          Issue Type: Bug
    Affects Versions: 2.1.0
            Reporter: Sergey Soldatov
            Assignee: Sergey Soldatov
             Fix For: 2.1.1


Admin.clearDeadServers is supposed to return the list of servers that were not cleared. But if RSGroupAdminEndpoint is set, the ConstraintException is thrown:
{noformat}
Caused by: org.apache.hadoop.hbase.ipc.RemoteWithExtrasException(org.apache.hadoop.hbase.constraint.ConstraintException): org.apache.hadoop.hbase.constraint.ConstraintException: The set of servers to remove cannot be null or empty.
	at org.apache.hadoop.hbase.rsgroup.RSGroupAdminServer.removeServers(RSGroupAdminServer.java:573)
	at org.apache.hadoop.hbase.rsgroup.RSGroupAdminEndpoint.postClearDeadServers(RSGroupAdminEndpoint.java:519)
	at org.apache.hadoop.hbase.master.MasterCoprocessorHost$133.call(MasterCoprocessorHost.java:1607)
	at org.apache.hadoop.hbase.master.MasterCoprocessorHost$133.call(MasterCoprocessorHost.java:1604)
	at org.apache.hadoop.hbase.coprocessor.CoprocessorHost$ObserverOperationWithoutResult.callObserver(CoprocessorHost.java:540)
	at org.apache.hadoop.hbase.coprocessor.CoprocessorHost.execOperation(CoprocessorHost.java:614)
	at org.apache.hadoop.hbase.master.MasterCoprocessorHost.postClearDeadServers(MasterCoprocessorHost.java:1604)
	at org.apache.hadoop.hbase.master.MasterRpcServices.clearDeadServers(MasterRpcServices.java:2231)
	at org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java)
	at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:409)
	at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:131)
	at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:324)
	at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:304)

{noformat}

That happens because in postClearDeadServers it calls groupAdminServer.removeServers(clearedServer) even if the clearedServer is empty.



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