[jira] [Commented] (HBASE-6958) TestAssignmentManager sometimes fails in trunk

2012-10-11 Thread Jimmy Xiang (JIRA) 

[ 
https://issues.apache.org/jira/browse/HBASE-6958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13474386#comment-13474386
 ] 

Jimmy Xiang commented on HBASE-6958:


With the patch(v4) for HBASE-6611, I ran the test 20+ times and didn't see the 
issue. Here is my env:

Apache Maven 3.0.3 (r1075438; 2011-02-28 09:31:09-0800)
Maven home: /etc/vendor/apache-maven-3.0.3
Java version: 1.7.0_07, vendor: Oracle Corporation
Java home: /etc/vendor/jdk1.7.0_07/jre
Default locale: en_US, platform encoding: UTF-8
OS name: linux, version: 3.0.0-14-generic, arch: amd64, family: unix

Here is the command I used:

mvn -DcompileSource=1.7 -PlocalTests clean test -Dtest=TestAssignmentManager


 TestAssignmentManager sometimes fails in trunk
 --

 Key: HBASE-6958
 URL: https://issues.apache.org/jira/browse/HBASE-6958
 Project: HBase
  Issue Type: Bug
Reporter: Ted Yu
 Fix For: 0.96.0


 From 
 https://builds.apache.org/job/HBase-TRUNK/3432/testReport/junit/org.apache.hadoop.hbase.master/TestAssignmentManager/testBalanceOnMasterFailoverScenarioWithOpenedNode/
  :
 {code}
 Stacktrace
 java.lang.Exception: test timed out after 5000 milliseconds
   at java.lang.System.arraycopy(Native Method)
   at java.lang.ThreadGroup.remove(ThreadGroup.java:969)
   at java.lang.ThreadGroup.threadTerminated(ThreadGroup.java:942)
   at java.lang.Thread.exit(Thread.java:732)
 ...
 2012-10-06 00:46:12,521 DEBUG [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 zookeeper.ZKUtil(1141): mockedServer-0x13a33892de7000e Retrieved 81 byte(s) 
 of data from znode /hbase/unassigned/dc01abf9cd7fd0ea256af4df02811640 and set 
 watcher; region=t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640., 
 state=M_ZK_REGION_OFFLINE, servername=master,1,1, createTime=1349484372509, 
 payload.length=0
 2012-10-06 00:46:12,522 ERROR [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 executor.EventHandler(205): Caught throwable while processing event 
 RS_ZK_REGION_CLOSED
 java.lang.NullPointerException
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$MockedLoadBalancer.randomAssignment(TestAssignmentManager.java:773)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1709)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1666)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1435)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1155)
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$AssignmentManagerWithExtrasForTesting.assign(TestAssignmentManager.java:1035)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1130)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1125)
   at 
 org.apache.hadoop.hbase.master.handler.ClosedRegionHandler.process(ClosedRegionHandler.java:106)
   at 
 org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:202)
   at 
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at 
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
 2012-10-06 00:46:12,522 DEBUG [pool-1-thread-1-EventThread] 
 master.AssignmentManager(670): Handling transition=M_ZK_REGION_OFFLINE, 
 server=master,1,1, region=dc01abf9cd7fd0ea256af4df02811640, current state 
 from region state map ={t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640. 
 state=OFFLINE, ts=1349484372508, server=null}
 {code}
 Looks like NPE happened on this line:
 {code}
   this.gate.set(true);
 {code}

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[jira] [Commented] (HBASE-6958) TestAssignmentManager sometimes fails in trunk

2012-10-10 Thread ramkrishna.s.vasudevan (JIRA) 

[ 
https://issues.apache.org/jira/browse/HBASE-6958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13473387#comment-13473387
 ] 

ramkrishna.s.vasudevan commented on HBASE-6958:
---

I was looking thro this.  As per the failing testcase it should not use the 
MockLoadBalancer itself.  Strange.
But the reason could be MockLoadBalancer is not reverted back to normal 
balancer in one of the testcase which uses MockLoadBalancer.  Added to that i 
was not able to reproduce the issue in my machine.

 TestAssignmentManager sometimes fails in trunk
 --

 Key: HBASE-6958
 URL: https://issues.apache.org/jira/browse/HBASE-6958
 Project: HBase
  Issue Type: Bug
Reporter: Ted Yu
 Fix For: 0.96.0


 From 
 https://builds.apache.org/job/HBase-TRUNK/3432/testReport/junit/org.apache.hadoop.hbase.master/TestAssignmentManager/testBalanceOnMasterFailoverScenarioWithOpenedNode/
  :
 {code}
 Stacktrace
 java.lang.Exception: test timed out after 5000 milliseconds
   at java.lang.System.arraycopy(Native Method)
   at java.lang.ThreadGroup.remove(ThreadGroup.java:969)
   at java.lang.ThreadGroup.threadTerminated(ThreadGroup.java:942)
   at java.lang.Thread.exit(Thread.java:732)
 ...
 2012-10-06 00:46:12,521 DEBUG [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 zookeeper.ZKUtil(1141): mockedServer-0x13a33892de7000e Retrieved 81 byte(s) 
 of data from znode /hbase/unassigned/dc01abf9cd7fd0ea256af4df02811640 and set 
 watcher; region=t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640., 
 state=M_ZK_REGION_OFFLINE, servername=master,1,1, createTime=1349484372509, 
 payload.length=0
 2012-10-06 00:46:12,522 ERROR [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 executor.EventHandler(205): Caught throwable while processing event 
 RS_ZK_REGION_CLOSED
 java.lang.NullPointerException
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$MockedLoadBalancer.randomAssignment(TestAssignmentManager.java:773)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1709)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1666)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1435)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1155)
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$AssignmentManagerWithExtrasForTesting.assign(TestAssignmentManager.java:1035)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1130)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1125)
   at 
 org.apache.hadoop.hbase.master.handler.ClosedRegionHandler.process(ClosedRegionHandler.java:106)
   at 
 org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:202)
   at 
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at 
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
 2012-10-06 00:46:12,522 DEBUG [pool-1-thread-1-EventThread] 
 master.AssignmentManager(670): Handling transition=M_ZK_REGION_OFFLINE, 
 server=master,1,1, region=dc01abf9cd7fd0ea256af4df02811640, current state 
 from region state map ={t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640. 
 state=OFFLINE, ts=1349484372508, server=null}
 {code}
 Looks like NPE happened on this line:
 {code}
   this.gate.set(true);
 {code}

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[jira] [Commented] (HBASE-6958) TestAssignmentManager sometimes fails in trunk

2012-10-10 Thread Jimmy Xiang (JIRA) 

[ 
https://issues.apache.org/jira/browse/HBASE-6958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13473414#comment-13473414
 ] 

Jimmy Xiang commented on HBASE-6958:


I am working on HBASE-6611, and very close to post a new patch (early next week 
most likely), which will change this test a little bit. We can check if the 
issue is still there with that patch.

 TestAssignmentManager sometimes fails in trunk
 --

 Key: HBASE-6958
 URL: https://issues.apache.org/jira/browse/HBASE-6958
 Project: HBase
  Issue Type: Bug
Reporter: Ted Yu
 Fix For: 0.96.0


 From 
 https://builds.apache.org/job/HBase-TRUNK/3432/testReport/junit/org.apache.hadoop.hbase.master/TestAssignmentManager/testBalanceOnMasterFailoverScenarioWithOpenedNode/
  :
 {code}
 Stacktrace
 java.lang.Exception: test timed out after 5000 milliseconds
   at java.lang.System.arraycopy(Native Method)
   at java.lang.ThreadGroup.remove(ThreadGroup.java:969)
   at java.lang.ThreadGroup.threadTerminated(ThreadGroup.java:942)
   at java.lang.Thread.exit(Thread.java:732)
 ...
 2012-10-06 00:46:12,521 DEBUG [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 zookeeper.ZKUtil(1141): mockedServer-0x13a33892de7000e Retrieved 81 byte(s) 
 of data from znode /hbase/unassigned/dc01abf9cd7fd0ea256af4df02811640 and set 
 watcher; region=t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640., 
 state=M_ZK_REGION_OFFLINE, servername=master,1,1, createTime=1349484372509, 
 payload.length=0
 2012-10-06 00:46:12,522 ERROR [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 executor.EventHandler(205): Caught throwable while processing event 
 RS_ZK_REGION_CLOSED
 java.lang.NullPointerException
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$MockedLoadBalancer.randomAssignment(TestAssignmentManager.java:773)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1709)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1666)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1435)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1155)
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$AssignmentManagerWithExtrasForTesting.assign(TestAssignmentManager.java:1035)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1130)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1125)
   at 
 org.apache.hadoop.hbase.master.handler.ClosedRegionHandler.process(ClosedRegionHandler.java:106)
   at 
 org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:202)
   at 
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at 
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
 2012-10-06 00:46:12,522 DEBUG [pool-1-thread-1-EventThread] 
 master.AssignmentManager(670): Handling transition=M_ZK_REGION_OFFLINE, 
 server=master,1,1, region=dc01abf9cd7fd0ea256af4df02811640, current state 
 from region state map ={t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640. 
 state=OFFLINE, ts=1349484372508, server=null}
 {code}
 Looks like NPE happened on this line:
 {code}
   this.gate.set(true);
 {code}

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[jira] [Commented] (HBASE-6958) TestAssignmentManager sometimes fails in trunk

2012-10-09 Thread stack (JIRA) 

[ 
https://issues.apache.org/jira/browse/HBASE-6958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13472751#comment-13472751
 ] 

stack commented on HBASE-6958:
--

Any chance of a patch Ted?

 TestAssignmentManager sometimes fails in trunk
 --

 Key: HBASE-6958
 URL: https://issues.apache.org/jira/browse/HBASE-6958
 Project: HBase
  Issue Type: Bug
Reporter: Ted Yu
 Fix For: 0.96.0


 From 
 https://builds.apache.org/job/HBase-TRUNK/3432/testReport/junit/org.apache.hadoop.hbase.master/TestAssignmentManager/testBalanceOnMasterFailoverScenarioWithOpenedNode/
  :
 {code}
 Stacktrace
 java.lang.Exception: test timed out after 5000 milliseconds
   at java.lang.System.arraycopy(Native Method)
   at java.lang.ThreadGroup.remove(ThreadGroup.java:969)
   at java.lang.ThreadGroup.threadTerminated(ThreadGroup.java:942)
   at java.lang.Thread.exit(Thread.java:732)
 ...
 2012-10-06 00:46:12,521 DEBUG [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 zookeeper.ZKUtil(1141): mockedServer-0x13a33892de7000e Retrieved 81 byte(s) 
 of data from znode /hbase/unassigned/dc01abf9cd7fd0ea256af4df02811640 and set 
 watcher; region=t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640., 
 state=M_ZK_REGION_OFFLINE, servername=master,1,1, createTime=1349484372509, 
 payload.length=0
 2012-10-06 00:46:12,522 ERROR [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 executor.EventHandler(205): Caught throwable while processing event 
 RS_ZK_REGION_CLOSED
 java.lang.NullPointerException
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$MockedLoadBalancer.randomAssignment(TestAssignmentManager.java:773)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1709)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1666)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1435)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1155)
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$AssignmentManagerWithExtrasForTesting.assign(TestAssignmentManager.java:1035)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1130)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1125)
   at 
 org.apache.hadoop.hbase.master.handler.ClosedRegionHandler.process(ClosedRegionHandler.java:106)
   at 
 org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:202)
   at 
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at 
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
 2012-10-06 00:46:12,522 DEBUG [pool-1-thread-1-EventThread] 
 master.AssignmentManager(670): Handling transition=M_ZK_REGION_OFFLINE, 
 server=master,1,1, region=dc01abf9cd7fd0ea256af4df02811640, current state 
 from region state map ={t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640. 
 state=OFFLINE, ts=1349484372508, server=null}
 {code}
 Looks like NPE happened on this line:
 {code}
   this.gate.set(true);
 {code}

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[jira] [Commented] (HBASE-6958) TestAssignmentManager sometimes fails in trunk

2012-10-09 Thread Jimmy Xiang (JIRA) 

[ 
https://issues.apache.org/jira/browse/HBASE-6958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13472792#comment-13472792
 ] 

Jimmy Xiang commented on HBASE-6958:


I can take a look next week if it is not urgent.

 TestAssignmentManager sometimes fails in trunk
 --

 Key: HBASE-6958
 URL: https://issues.apache.org/jira/browse/HBASE-6958
 Project: HBase
  Issue Type: Bug
Reporter: Ted Yu
 Fix For: 0.96.0


 From 
 https://builds.apache.org/job/HBase-TRUNK/3432/testReport/junit/org.apache.hadoop.hbase.master/TestAssignmentManager/testBalanceOnMasterFailoverScenarioWithOpenedNode/
  :
 {code}
 Stacktrace
 java.lang.Exception: test timed out after 5000 milliseconds
   at java.lang.System.arraycopy(Native Method)
   at java.lang.ThreadGroup.remove(ThreadGroup.java:969)
   at java.lang.ThreadGroup.threadTerminated(ThreadGroup.java:942)
   at java.lang.Thread.exit(Thread.java:732)
 ...
 2012-10-06 00:46:12,521 DEBUG [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 zookeeper.ZKUtil(1141): mockedServer-0x13a33892de7000e Retrieved 81 byte(s) 
 of data from znode /hbase/unassigned/dc01abf9cd7fd0ea256af4df02811640 and set 
 watcher; region=t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640., 
 state=M_ZK_REGION_OFFLINE, servername=master,1,1, createTime=1349484372509, 
 payload.length=0
 2012-10-06 00:46:12,522 ERROR [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 executor.EventHandler(205): Caught throwable while processing event 
 RS_ZK_REGION_CLOSED
 java.lang.NullPointerException
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$MockedLoadBalancer.randomAssignment(TestAssignmentManager.java:773)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1709)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1666)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1435)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1155)
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$AssignmentManagerWithExtrasForTesting.assign(TestAssignmentManager.java:1035)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1130)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1125)
   at 
 org.apache.hadoop.hbase.master.handler.ClosedRegionHandler.process(ClosedRegionHandler.java:106)
   at 
 org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:202)
   at 
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at 
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
 2012-10-06 00:46:12,522 DEBUG [pool-1-thread-1-EventThread] 
 master.AssignmentManager(670): Handling transition=M_ZK_REGION_OFFLINE, 
 server=master,1,1, region=dc01abf9cd7fd0ea256af4df02811640, current state 
 from region state map ={t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640. 
 state=OFFLINE, ts=1349484372508, server=null}
 {code}
 Looks like NPE happened on this line:
 {code}
   this.gate.set(true);
 {code}

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[jira] [Commented] (HBASE-6958) TestAssignmentManager sometimes fails in trunk

2012-10-05 Thread Ted Yu (JIRA) 

[ 
https://issues.apache.org/jira/browse/HBASE-6958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13470884#comment-13470884
 ] 

Ted Yu commented on HBASE-6958:
---

Here is my environment:

Darwin L0032 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; 
root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64

java version 1.7.0_07
Java(TM) SE Runtime Environment (build 1.7.0_07-b10)
Java HotSpot(TM) 64-Bit Server VM (build 23.3-b01, mixed mode)

 TestAssignmentManager sometimes fails in trunk
 --

 Key: HBASE-6958
 URL: https://issues.apache.org/jira/browse/HBASE-6958
 Project: HBase
  Issue Type: Bug
Reporter: Ted Yu
 Fix For: 0.96.0


 From 
 https://builds.apache.org/job/HBase-TRUNK/3432/testReport/junit/org.apache.hadoop.hbase.master/TestAssignmentManager/testBalanceOnMasterFailoverScenarioWithOpenedNode/
  :
 {code}
 Stacktrace
 java.lang.Exception: test timed out after 5000 milliseconds
   at java.lang.System.arraycopy(Native Method)
   at java.lang.ThreadGroup.remove(ThreadGroup.java:969)
   at java.lang.ThreadGroup.threadTerminated(ThreadGroup.java:942)
   at java.lang.Thread.exit(Thread.java:732)
 ...
 2012-10-06 00:46:12,521 DEBUG [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 zookeeper.ZKUtil(1141): mockedServer-0x13a33892de7000e Retrieved 81 byte(s) 
 of data from znode /hbase/unassigned/dc01abf9cd7fd0ea256af4df02811640 and set 
 watcher; region=t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640., 
 state=M_ZK_REGION_OFFLINE, servername=master,1,1, createTime=1349484372509, 
 payload.length=0
 2012-10-06 00:46:12,522 ERROR [MASTER_CLOSE_REGION-mockedAMExecutor-0] 
 executor.EventHandler(205): Caught throwable while processing event 
 RS_ZK_REGION_CLOSED
 java.lang.NullPointerException
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$MockedLoadBalancer.randomAssignment(TestAssignmentManager.java:773)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1709)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:1666)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1435)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1155)
   at 
 org.apache.hadoop.hbase.master.TestAssignmentManager$AssignmentManagerWithExtrasForTesting.assign(TestAssignmentManager.java:1035)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1130)
   at 
 org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1125)
   at 
 org.apache.hadoop.hbase.master.handler.ClosedRegionHandler.process(ClosedRegionHandler.java:106)
   at 
 org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:202)
   at 
 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at 
 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
 2012-10-06 00:46:12,522 DEBUG [pool-1-thread-1-EventThread] 
 master.AssignmentManager(670): Handling transition=M_ZK_REGION_OFFLINE, 
 server=master,1,1, region=dc01abf9cd7fd0ea256af4df02811640, current state 
 from region state map ={t,,1349484359011.dc01abf9cd7fd0ea256af4df02811640. 
 state=OFFLINE, ts=1349484372508, server=null}
 {code}
 Looks like NPE happened on this line:
 {code}
   this.gate.set(true);
 {code}

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