Null pointer exception

Wed, 15 Apr 2009 03:31:25 -0700 

Hi,
      My hbase suddenly goes down,

when i check the logs, i get the following exception at master node's region
server:

2009-04-15 08:37:09,158 FATAL
org.apache.hadoop.hbase.regionserver.HRegionServer: Unhandled exception.
Aborting...
java.lang.NullPointerException
        at
org.apache.hadoop.hbase.regionserver.HRegionServer$ToDoEntry.access$100(HRegionServer.java:1201)
        at
org.apache.hadoop.hbase.regionserver.HRegionServer.housekeeping(HRegionServer.java:1058)
        at
org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:450)
        at java.lang.Thread.run(Thread.java:619)
2009-04-15 08:37:09,159 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer: Dump of metrics:
request=27, regions=42, stores=202, storefiles=247, storefileIndexSize=0,
memcacheSize=0, usedHeap=116, maxHeap=888

How do i correct this?

Thanks
Raakhi

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