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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-750) NPE caused by StoreFileScanner.updateReaders
Date Thu, 17 Jul 2008 18:23:32 GMT
NPE caused by StoreFileScanner.updateReaders
--------------------------------------------

                 Key: HBASE-750
                 URL: https://issues.apache.org/jira/browse/HBASE-750
             Project: Hadoop HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.2.0
         Environment: CentOS 5.1 x86_64 / 64-bit JDK build 1.6.0_03-b05
            Reporter: Andrew Purtell


Running a test to determine performance during inserts of many 100,000s of cells into a single
column family in a single row, the region server involved went down after taking a NPE:

2008-07-17 18:12:18,051 FATAL org.apache.hadoop.hbase.regionserver.Flusher: Replay of hlog
required. Forcing server restart
org.apache.hadoop.hbase.DroppedSnapshotException
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1040)
        at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:942)
        at org.apache.hadoop.hbase.regionserver.Flusher.flushRegion(Flusher.java:174)
        at org.apache.hadoop.hbase.regionserver.Flusher.run(Flusher.java:93)
Caused by: java.lang.NullPointerException
        at java.lang.String.<init>(String.java:516)
        at org.apache.hadoop.hbase.util.Bytes.toString(Bytes.java:71)
        at org.apache.hadoop.hbase.regionserver.StoreFileScanner.updateReaders(StoreFileScanner.java:374)
        at org.apache.hadoop.hbase.regionserver.HStore.notifyChangedReadersObservers(HStore.java:797)
        at org.apache.hadoop.hbase.regionserver.HStore.updateReaders(HStore.java:784)
        at org.apache.hadoop.hbase.regionserver.HStore.internalFlushCache(HStore.java:755)
        at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:682)
        at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1030)
        ... 3 more

Any ideas about this one?


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