Another NPE in ReadWriteConsistencyControl
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Key: HBASE-2797
URL: https://issues.apache.org/jira/browse/HBASE-2797
Project: HBase
Issue Type: Bug
Affects Versions: 0.20.5
Reporter: Dave Latham
Priority: Blocker
Fix For: 0.20.6
This occurred on a cluster with 46 slaves, running a couple MR jobs. One doing
heavy writes copying everything from one table to a new table with a different
schema. After one regionserver went down, about 40 of them died within an hour
before it was caught and the jobs stopped. Let me know if any other piece of
context would be particularly helpful.
This exception appears in the .out file:
Exception in thread "regionserver/192.168.41.2:60020"
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:320)
at
org.apache.hadoop.hbase.regionserver.StoreScanner.checkReseek(StoreScanner.java:306)
at
org.apache.hadoop.hbase.regionserver.StoreScanner.peek(StoreScanner.java:143)
at
org.apache.hadoop.hbase.regionserver.KeyValueHeap$KVScannerComparator.compare(KeyValueHeap.java:127)
at
org.apache.hadoop.hbase.regionserver.KeyValueHeap$KVScannerComparator.compare(KeyValueHeap.java:117)
at
java.util.PriorityQueue.siftDownUsingComparator(PriorityQueue.java:644)
at java.util.PriorityQueue.siftDown(PriorityQueue.java:612)
at java.util.PriorityQueue.poll(PriorityQueue.java:523)
at
org.apache.hadoop.hbase.regionserver.KeyValueHeap.close(KeyValueHeap.java:151)
at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScanner.close(HRegion.java:1971)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.closeAllRegions(HRegionServer.java:1610)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:621)
at java.lang.Thread.run(Thread.java:619)
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