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https://issues.apache.org/jira/browse/HBASE-5094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ramkrishna.s.vasudevan updated HBASE-5094:
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Summary: The META can hold an entry for a region with a different server
name from the one actually in the AssignmentManager thus making the region
inaccessible. (was: The META can hold an entry for a region with a different
server name from the one actually in the AssignmentManager thus making the
region unaccessible.)
> The META can hold an entry for a region with a different server name from the
> one actually in the AssignmentManager thus making the region inaccessible.
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-5094
> URL: https://issues.apache.org/jira/browse/HBASE-5094
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
>
> R1 is reassigned to RS3 during RS1 shutdown, even though R1 was just assigned
> to RS2 by load balancer. So .META. table indicated R1 is on RS3. Both RS2 and
> RS3 think they have R1. Later when RS3 shutdown, R1 is reassigned to RS2. RS2
> will indicate ALREADY_OPENED. Thus the region is considered assigned to RS2
> even though .META. indicates it is on RS3.
> T1: Load balancer tried to move R1 from RS1 to RS2
> . 2011-11-21 14:03:20,812 INFO org.apache.hadoop.hbase.master.HMaster:
> balance
> hri=tableXY,\xB8Q\xEB\x85\x1E\xB8Q\xDF,1321573099841.ee2e205a60f1bb06cc73bc9df06289df.,
> src=skynet-1,60020,1321912978281, dest=skynet-4,60020,1321912999305
> T2: RS1 shutdown. 2011-11-21 14:03:24,759 DEBUG
> org.apache.hadoop.hbase.master.ServerManager:
> Added=skynet-1,60020,1321912978281 to dead servers, submitted shutdown
> handler to be executed, root=false, meta=true
> T3:R1 is opened on RS2. 2011-11-21 14:03:26,131 DEBUG
> org.apache.hadoop.hbase.master.handler.OpenedRegionHandler: The master has
> opened the region
> tableXY,\xB8Q\xEB\x85\x1E\xB8Q\xDF,1321573099841.ee2e205a60f1bb06cc73bc9df06289df.
> that was online on skynet-4,60020,1321912999305
> T4: As part of RS1 shutdown handling, region reassignment starts. It uses the
> region location captured at T2. 2011-11-21 14:03:26,152 INFO
> org.apache.hadoop.hbase.master.handler.ServerShutdownHandler: Reassigning 32
> region(s) that skynet-1,60020,1321912978281 was carrying (skipping 0
> regions(s) that are already in transition)
> T5: R1 is assigned to RS3. 2011-11-21 14:03:27,404 DEBUG
> org.apache.hadoop.hbase.zookeeper.ZKUtil: master:60000-0x133b84f9f490000
> Retrieved 115 byte(s) of data from znode
> /hbase/unassigned/ee2e205a60f1bb06cc73bc9df06289df;
> data=region=tableXY,\xB8Q\xEB\x85\x1E\xB8Q\xDF,1321573099841.ee2e205a60f1bb06cc73bc9df06289df.,
> origin=skynet-3,60020,1321912991430, state=RS_ZK_REGION_OPENED
> T6: RS3 shutdown. R1 is reassigned to RS2. 2011-11-21 14:03:37,899 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: ALREADY_OPENED region
> tableXY,\xB8Q\xEB\x85\x1E\xB8Q\xDF,1321573099841.ee2e205a60f1bb06cc73bc9df06289df.
> to skynet-4,60020,1321912999305
> From AssignmentManager point of view, the R1 is assigned to RS2. The .META.
> table indicates the location is RS3.
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