[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira