get NPE during MajorCompactionChecker
--------------------------------------
Key: HBASE-5532
URL: https://issues.apache.org/jira/browse/HBASE-5532
Project: HBase
Issue Type: Bug
Components: regionserver
Reporter: terry zhang
We found error log (NullPointerException) below on our online cluster:
2012-03-05 00:17:09,592 ERROR
org.apache.hadoop.hbase.regionserver.HRegionServer$MajorCompactionChecker:
Caught exception
java.lang.NullPointerException
at
org.apache.hadoop.hbase.regionserver.Store.isMajorCompaction(Store.java:878)
at
org.apache.hadoop.hbase.regionserver.Store.isMajorCompaction(Store.java:857)
at
org.apache.hadoop.hbase.regionserver.HRegion.isMajorCompaction(HRegion.java:3017)
at
org.apache.hadoop.hbase.regionserver.HRegionServer$MajorCompactionChecker.chore(HRegionServer.java:1172)
at org.apache.hadoop.hbase.Chore.run(Chore.java:66)
After Check the code we found although it already check whether store files has
null reader at the begin of the function(isMajorCompaction), but it still has
some possibility the reader is closed before it return(eg mini compaction). So
we need to check store file reader before we use it to avoid this NPE
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