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From "Zhihong Yu (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5094) 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.
Date Mon, 26 Dec 2011 06:58:30 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhihong Yu updated HBASE-5094:
------------------------------

    Reporter: ramkrishna.s.vasudevan  (was: Ted Yu)
    
> 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: ramkrishna.s.vasudevan
>
> 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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