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https://issues.apache.org/jira/browse/HBASE-20927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16558313#comment-16558313
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Ted Yu commented on HBASE-20927:
--------------------------------
Triggered another QA run.
> 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
> Priority: Major
> Fix For: 3.0.0, 2.1.1
>
> Attachments: HBASE-20927-master.patch, HBASE-20927.master.002.patch
>
>
> 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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