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From "Matt Corgan (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3408) AssignmentManager NullPointerException
Date Tue, 04 Jan 2011 05:23:45 GMT
AssignmentManager NullPointerException

                 Key: HBASE-3408
                 URL: https://issues.apache.org/jira/browse/HBASE-3408
             Project: HBase
          Issue Type: Bug
          Components: master
    Affects Versions: 0.90.0
            Reporter: Matt Corgan
             Fix For: 0.90.0

If AssignmentManager tries to move a region to an invalid destination server, rather than
choosing a random server as intended, it throws an NPE.

Line 1009 should check if getDestination()==null:

 if (existingPlan == null || forceNewPlan ||
          (existingPlan.getDestination() != null && existingPlan.getDestination().equals(serverToExclude)))

I triggered it by trying to manually move regions around, probably to an invalid destination
server.  I'm not currently able to build the project to test if that's the extent of the problem,
so here's a little more info...  

It leaves a stranded region-in-transition until the master and/or regionserver are restarted
and causes problems like the following.  "hbck -fix" was unable to repair it.

2011-01-04 00:14:10,948 DEBUG org.apache.hadoop.hbase.master.CatalogJanitor: Scanned 4287
catalog row(s) and gc'd 0 unreferenced parent region(s)
2011-01-04 00:14:18,574 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer
because 1 region(s) in transition: {23ebce9a5d174f87bfb96ed1da387fdc=RandomValue,,1291219068335.23ebce9a5d174f87bfb96ed1da387fdc.
state=OFFLINE, ts=1294118046139}
2011-01-04 00:14:36,142 INFO org.apache.hadoop.hbase.master.AssignmentManager: Regions in
transition timed out:  RandomValue,,1291219068335.23ebce9a5d174f87bfb96ed1da387fdc. state=OFFLINE,
2011-01-04 00:14:36,142 INFO org.apache.hadoop.hbase.master.AssignmentManager: Region has
been OFFLINE for too long, reassigning RandomValue,,1291219068335.23ebce9a5d174f87bfb96ed1da387fdc.
to a random server
2011-01-04 00:14:36,142 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Forcing OFFLINE;
was=RandomValue,,1291219068335.23ebce9a5d174f87bfb96ed1da387fdc. state=OFFLINE, ts=1294118046139
2011-01-04 00:14:36,142 ERROR org.apache.hadoop.hbase.master.AssignmentManager$TimeoutMonitor:
Caught exception
        at org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:934)
(i think this is .90.0RC1, so same bug on a different line number)
        at org.apache.hadoop.hbase.master.AssignmentManager.getRegionPlan(AssignmentManager.java:909)
        at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:822)
        at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:663)
        at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:643)
        at org.apache.hadoop.hbase.master.AssignmentManager$TimeoutMonitor.chore(AssignmentManager.java:1481)
        at org.apache.hadoop.hbase.Chore.run(Chore.java:66)

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