ndimiduk opened a new pull request, #5723:
URL: https://github.com/apache/hbase/pull/5723
We see unit test failures in Jenkins that look like this:
```
java.lang.IllegalArgumentException: run queue not empty
at
org.apache.hbase.thirdparty.com.google.common.base.Preconditions.checkArgument(Preconditions.java:143)
at
org.apache.hadoop.hbase.procedure2.ProcedureExecutor.load(ProcedureExecutor.java:332)
at
org.apache.hadoop.hbase.procedure2.ProcedureExecutor.init(ProcedureExecutor.java:665)
at
org.apache.hadoop.hbase.procedure2.ProcedureTestingUtility.restart(ProcedureTestingUtility.java:132)
at
org.apache.hadoop.hbase.procedure2.ProcedureTestingUtility.restart(ProcedureTestingUtility.java:100)
at
org.apache.hadoop.hbase.master.procedure.MasterProcedureTestingUtility.restartMasterProcedureExecutor(MasterProcedureTestingUtility.java:85)
at
org.apache.hadoop.hbase.master.assignment.TestRollbackSCP.testFailAndRollback(TestRollbackSCP.java:180)
```
This isn't enough information to debug the situation. The test code in
question looks reasonable enough – it clears the object for re-use between
tests. However, somewhere between stop/clear/start we miss something. Add some
toString implementations and dump the objects in the preconditions.
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