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https://issues.apache.org/jira/browse/HBASE-8954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13709043#comment-13709043
 ] 

Jimmy Xiang commented on HBASE-8954:
------------------------------------

Again this is a thread racing issue. The log split task is already picked up 
before taskReadySeq is increased by the ZK event process thread.
                
> TestSplitLogWorker#testPreemptTask failed
> -----------------------------------------
>
>                 Key: HBASE-8954
>                 URL: https://issues.apache.org/jira/browse/HBASE-8954
>             Project: HBase
>          Issue Type: Test
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>            Priority: Minor
>
> http://54.241.6.143/job/HBase-0.95-Hadoop-2/org.apache.hbase$hbase-server/627/testReport/junit/org.apache.hadoop.hbase.regionserver/TestSplitLogWorker/testPreemptTask/
> {noformat}
> java.lang.AssertionError: expected:<1> but was:<0>
>       at org.junit.Assert.fail(Assert.java:88)
>       at org.junit.Assert.failNotEquals(Assert.java:743)
>       at org.junit.Assert.assertEquals(Assert.java:118)
>       at org.junit.Assert.assertEquals(Assert.java:555)
>       at org.junit.Assert.assertEquals(Assert.java:542)
>       at 
> org.apache.hadoop.hbase.regionserver.TestSplitLogWorker.testPreemptTask(TestSplitLogWorker.java:211)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>       at java.lang.reflect.Method.invoke(Method.java:597)
>       at 
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
>       at 
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
>       at 
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
>       at 
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
>       at 
> org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
>       at 
> org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
>       at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
>       at 
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
>       at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
>       at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
>       at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
>       at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
>       at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
>       at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
>       at org.junit.runners.Suite.runChild(Suite.java:127)
>       at org.junit.runners.Suite.runChild(Suite.java:26)
>       at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
>       at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
>       at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
>       at java.util.concurrent.FutureTask.run(FutureTask.java:138)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
>       at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
>       at java.lang.Thread.run(Thread.java:662)
> {noformat}

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