[HBASE-2740] NPE in ReadWriteConsistencyControl

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 0.20.5
• Assignee: ryan rawson
• Reporter: Dave Latham
• Created: 16/Jun/10 23:56
• Updated: 12/Oct/12 06:15
• Resolved: 17/Jun/10 18:48

Description

A region server running 0.20.5rc3 died with this exception:

2010-06-16 12:19:03,694 FATAL org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Replay of hlog required. Forcing server shutdown
org.apache.hadoop.hbase.DroppedSnapshotException: region: xxxxxxxxxx,1272579746382
at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1041)
at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:896)
at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:262)
at org.apache.hadoop.hbase.regionserver.MemStoreFlusher.run(MemStoreFlusher.java:149)
Caused by: java.lang.NullPointerException
at org.apache.hadoop.hbase.regionserver.ReadWriteConsistencyControl.getThreadReadPoint(ReadWriteConsistencyControl.java:40)
at org.apache.hadoop.hbase.regionserver.MemStore$MemStoreScanner.getNext(MemStore.java:532)
at org.apache.hadoop.hbase.regionserver.MemStore$MemStoreScanner.seek(MemStore.java:558)
at org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:311)
at org.apache.hadoop.hbase.regionserver.StoreScanner.checkReseek(StoreScanner.java:297)
at org.apache.hadoop.hbase.regionserver.StoreScanner.peek(StoreScanner.java:143)
at org.apache.hadoop.hbase.regionserver.StoreScanner.updateReaders(StoreScanner.java:283)
at org.apache.hadoop.hbase.regionserver.Store.notifyChangedReadersObservers(Store.java:621)
at org.apache.hadoop.hbase.regionserver.Store.updateStorefiles(Store.java:607)
at org.apache.hadoop.hbase.regionserver.Store.access$200(Store.java:88)
at org.apache.hadoop.hbase.regionserver.Store$StoreFlusherImpl.commit(Store.java:1605)
at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1019)
... 3 more