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From Yves Langisch <y...@langisch.ch>
Subject NPE while obtaining row lock
Date Tue, 13 Dec 2011 07:52:47 GMT
Hi,

from time to time I get a NPE on my regionserver. Apparently it's occurring while obtaining
a row lock: 

---
2011-12-13 02:00:19,582 DEBUG org.apache.hadoop.hbase.io.hfile.LruBlockCache: Block cache
LRU eviction completed; freed=39.59 MB, total=296.26 MB, single=164.82 MB, multi=167.62 MB,
memory=42.16 KB
2011-12-13 02:00:20,365 ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: Error obtaining
row lock (fsOk: true)
java.lang.NullPointerException
        at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:881)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.addRowLock(HRegionServer.java:2010)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.lockRow(HRegionServer.java:1996)
        at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:570)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1039)
2011-12-13 02:00:20,529 DEBUG org.apache.hadoop.hbase.io.hfile.LruBlockCache: Block cache
LRU eviction started; Attempting to free 39.56 MB of total=335.72 MB
2011-12-13 02:00:20,532 DEBUG org.apache.hadoop.hbase.io.hfile.LruBlockCache: Block cache
LRU eviction completed; freed=39.59 MB, total=296.2 MB, single=177.89 MB, multi=154.62 MB,
memory=42.16 KB
2011-12-13 02:00:21,433 DEBUG org.apache.hadoop.hbase.io.hfile.LruBlockCache: Block cache
LRU eviction started; Attempting to free 39.49 MB of total=335.66 MB
2011-12-13 02:00:21,435 DEBUG org.apache.hadoop.hbase.io.hfile.LruBlockCache: Block cache
LRU eviction completed; freed=39.52 MB, total=296.14 MB, single=172.92 MB, multi=159.46 MB,
memory=42.16 KB
---

Any ideas?

Regards
Yves
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