[HBASE-5532] get NPE during MajorCompactionChecker

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Component/s: regionserver
• Labels: delete
• Assignee: Unassigned
• Reporter: terry zhang
• Created: 06/Mar/12 08:57
• Updated: 13/Jun/22 15:36
• Resolved: 10/Jan/15 01:49

Description

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