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https://issues.apache.org/jira/browse/HBASE-5200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13210093#comment-13210093
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stack commented on HBASE-5200:
------------------------------
Ok. Go ahead commit Ram?
> AM.ProcessRegionInTransition() and AM.handleRegion() race thus leaving the
> region assignment inconsistent
> ---------------------------------------------------------------------------------------------------------
>
> Key: HBASE-5200
> URL: https://issues.apache.org/jira/browse/HBASE-5200
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.90.5
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 0.94.0, 0.90.7, 0.92.1
>
> Attachments: 5200-test.txt, 5200-v2.txt, 5200-v3.txt, 5200-v4.txt,
> HBASE-5200.patch, HBASE-5200_1.patch,
> HBASE-5200_trunk_latest_with_test_2.patch,
> TEST-org.apache.hadoop.hbase.master.TestRestartCluster.xml,
> hbase-5200_90_latest.patch, hbase-5200_90_latest_new.patch
>
>
> This is the scenario
> Consider a case where the balancer is going on thus trying to close regions
> in a RS.
> Before we could close a master switch happens.
> On Master switch the set of nodes that are in RIT is collected and we first
> get Data and start watching the node
> After that the node data is added into RIT.
> Now by this time (before adding to RIT) if the RS to which close was called
> does a transition in AM.handleRegion() we miss the handling saying RIT state
> was null.
> {code}
> 2012-01-13 10:50:46,358 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Received CLOSED for region
> a66d281d231dfcaea97c270698b26b6f from server
> HOST-192-168-47-205,20020,1326363111288 but region was in the state null and
> not in expected PENDING_CLOSE or CLOSING states
> 2012-01-13 10:50:46,358 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Received CLOSED for region
> c12e53bfd48ddc5eec507d66821c4d23 from server
> HOST-192-168-47-205,20020,1326363111288 but region was in the state null and
> not in expected PENDING_CLOSE or CLOSING states
> 2012-01-13 10:50:46,358 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Received CLOSED for region
> 59ae13de8c1eb325a0dd51f4902d2052 from server
> HOST-192-168-47-205,20020,1326363111288 but region was in the state null and
> not in expected PENDING_CLOSE or CLOSING states
> 2012-01-13 10:50:46,359 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Received CLOSED for region
> f45bc9614d7575f35244849af85aa078 from server
> HOST-192-168-47-205,20020,1326363111288 but region was in the state null and
> not in expected PENDING_CLOSE or CLOSING states
> 2012-01-13 10:50:46,359 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Received CLOSED for region
> cc3ecd7054fe6cd4a1159ed92fd62641 from server
> HOST-192-168-47-204,20020,1326342744518 but region was in the state null and
> not in expected PENDING_CLOSE or CLOSING states
> 2012-01-13 10:50:46,359 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Received CLOSED for region
> 3af40478a17fee96b4a192b22c90d5a2 from server
> HOST-192-168-47-205,20020,1326363111288 but region was in the state null and
> not in expected PENDING_CLOSE or CLOSING states
> 2012-01-13 10:50:46,359 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Received CLOSED for region
> e6096a8466e730463e10d3d61f809b92 from server
> HOST-192-168-47-204,20020,1326342744518 but region was in the state null and
> not in expected PENDING_CLOSE or CLOSING states
> 2012-01-13 10:50:46,359 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Received CLOSED for region
> 4806781a1a23066f7baed22b4d237e24 from server
> HOST-192-168-47-204,20020,1326342744518 but region was in the state null and
> not in expected PENDING_CLOSE or CLOSING states
> 2012-01-13 10:50:46,359 WARN
> org.apache.hadoop.hbase.master.AssignmentManager: Received CLOSED for region
> d69e104131accaefe21dcc01fddc7629 from server
> HOST-192-168-47-205,20020,1326363111288 but region was in the state null and
> not in expected PENDING_CLOSE or CLOSING states
> {code}
> In branch the CLOSING node is created by RS thus leading to more
> inconsistency.
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