[ https://issues.apache.org/jira/browse/HBASE-5532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223909#comment-13223909 ]
terry zhang commented on HBASE-5532: ------------------------------------ Hi, Ted. Our is base on 0.90.2 (including many patches from 90.3 till 90.5). > 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 > Attachments: HBASE-5532.patch > > > 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 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira