NPE in housekeeping
-------------------

                 Key: HBASE-1386
                 URL: https://issues.apache.org/jira/browse/HBASE-1386
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack
             Fix For: 0.20.0


Two regionservers hosting thousands of regions.  One went down. Other was 
trying to open about 1000 regions and got this:

{code}
2009-05-07 10:24:59,995 [regionserver/0:0:0:0:0:0:0:0:60021.worker] INFO 
org.apache.hadoop.hbase.regionserver.HRegionServer: Worker: MSG_REGION_OPEN: 
REGION => {NAME => 'TestTable,1094797576,1241684896885', STARTKEY => 
'1094797576', ENDKEY => '1096819542', ENCOD
ED => 1333893125, TABLE => {{NAME => 'TestTable', FAMILIES => [{NAME => 'info', 
COMPRESSION => 'NONE', VERSIONS => '3', LENGTH => '2147483647', TTL => '-1', 
BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 'false'}]}}
2009-05-07 10:24:59,996 [regionserver/0:0:0:0:0:0:0:0:60021] FATAL 
org.apache.hadoop.hbase.regionserver.HRegionServer: Unhandled exception. 
Aborting...
java.lang.NullPointerException
    at 
org.apache.hadoop.hbase.regionserver.HRegionServer.housekeeping(HRegionServer.java:1141)
    at 
org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:518)
    at java.lang.Thread.run(Thread.java:619)
{code}

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