[HBASE-750] NPE caused by StoreFileScanner.updateReaders

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.2.0
• Fix Version/s: 0.2.0
• Component/s: regionserver

Environment

CentOS 5.1 x86_64 / 64-bit JDK build 1.6.0_03-b05

• Assignee: Michael Stack
• Reporter: Andrew Kyle Purtell
• Created: 17/Jul/08 18:21
• Updated: 22/Aug/08 21:13
• Resolved: 23/Jul/08 19:33

Description

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?