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https://issues.apache.org/jira/browse/HBASE-4075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061539#comment-13061539
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stack commented on HBASE-4075:
------------------------------
Do you have a patch Jieshan?
> A bug in TestZKBasedOpenCloseRegion
> -----------------------------------
>
> Key: HBASE-4075
> URL: https://issues.apache.org/jira/browse/HBASE-4075
> Project: HBase
> Issue Type: Bug
> Components: test
> Affects Versions: 0.90.3
> Reporter: Jieshan Bean
> Priority: Minor
> Fix For: 0.90.4
>
>
> The following two test cases was executed orderly:
> 1.TestZKBasedOpenCloseRegion#testCloseRegion()
> 2.TestZKBasedOpenCloseRegion#testRSAlreadyProcessingRegion()
> I found the problem while the two test cases used the same region with little
> possibility. The following describtion called the region as RegionA
> (1). Region-A was closed in the test of "testCloseRegion". And it was trying
> to be opening at the end of "testCloseRegion".
> {noformat}
> 2011-06-20 08:14:24,967 DEBUG [main-EventThread]
> master.AssignmentManager(374): Handling transition=RS_ZK_REGION_OPENING,
> server=linux1.site,41784,1308528851644,
> region=5251635727486eb97dfbe6f953c587c3
> 2011-06-20 08:14:24,967 DEBUG
> [RS_OPEN_REGION-linux1.site,41784,1308528851644-2] regionserver.HRegion(311):
> Instantiated
> TestZKBasedOpenCloseRegion,ccc,1308528860373.5251635727486eb97dfbe6f953c587c3.
> 2011-06-20 08:14:24,986 INFO [Thread-397]
> master.TestZKBasedOpenCloseRegion(213): Done with testCloseRegion
> {noformat}
> (2). The region next test case used was just the same region which was
> opening:
> {noformat}
> 2011-06-20 08:14:25,012 INFO [main]
> master.TestZKBasedOpenCloseRegion(139): .META.,,1.1028785192
> 2011-06-20 08:14:25,013 INFO [main]
> master.TestZKBasedOpenCloseRegion(139):
> TestZKBasedOpenCloseRegion,ccc,1308528860373.5251635727486eb97dfbe6f953c587c3.
> {noformat}
> (3) In test case 2, the code of "while (!reopenEventProcessed.get())" got an
> un-expect OPENED event from the prev opening.
> {noformat}
> EventHandlerListener openListener =
> new ReopenEventListener(hri.getRegionNameAsString(),
> reopenEventProcessed, EventType.RS_ZK_REGION_OPENED);
> cluster.getMaster().executorService.
> registerListener(EventType.RS_ZK_REGION_OPENED, openListener);
> // now ask the master to move the region to hr1, will fail
> TEST_UTIL.getHBaseAdmin().move(hri.getEncodedNameAsBytes(),
> Bytes.toBytes(hr1.getServerName()));
>
> while (!reopenEventProcessed.get()) {
> Threads.sleep(100);
> }
> {noformat}
> {noformat}
> 2011-06-20 08:14:25,032 DEBUG [MASTER_OPEN_REGION-linux1.site:34061-4]
> handler.OpenedRegionHandler(108): Opened region
> TestZKBasedOpenCloseRegion,ccc,1308528860373.5251635727486eb97dfbe6f953c587c3.
> on linux1.site,41784,1308528851644
> 2011-06-20 08:14:25,033 INFO [MASTER_OPEN_REGION-linux1.site:34061-4]
> master.TestZKBasedOpenCloseRegion$ReopenEventListener(170):
> afterProcess(org.apache.hadoop.hbase.master.handler.OpenedRegionHandler@711185e7)
> 2011-06-20 08:14:25,033 INFO [MASTER_OPEN_REGION-linux1.site:34061-4]
> master.TestZKBasedOpenCloseRegion$ReopenEventListener(172): Finished
> processing RS_ZK_REGION_OPENED
> {noformat}
> So it think the region was opened, but really not.
>
> (4) So the test failed.
> {noformat}
> java.lang.reflect.UndeclaredThrowableException
> at $Proxy24.move(Unknown Source)
> at
> org.apache.hadoop.hbase.client.HBaseAdmin.move(HBaseAdmin.java:978)
> at
> org.apache.hadoop.hbase.master.TestZKBasedOpenCloseRegion.testRSAlreadyProcessingRegion(TestZKBasedOpenCloseRegion.java:291)
>
> Caused by: org.apache.hadoop.ipc.RemoteException:
> org.apache.hadoop.hbase.UnknownRegionException:
> 5251635727486eb97dfbe6f953c587c3
> at org.apache.hadoop.hbase.master.HMaster.move(HMaster.java:725)
> {noformat}
> Exchange the position of the two test cases will solve the problem.
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