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From Stack <st...@duboce.net>
Subject Re: NPE while obtaining row lock
Date Wed, 14 Dec 2011 06:10:49 GMT
On Mon, Dec 12, 2011 at 11:52 PM, Yves Langisch <yves@langisch.ch> wrote:
> 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)

Any chance you are passing a null lockid Yves?

See below:

2005	  protected long addRowLock(Integer r, HRegion region)
2006	      throws LeaseStillHeldException {
2007	    long lockId = -1L;
2008	    lockId = rand.nextLong();
2009	    String lockName = String.valueOf(lockId);
2010	    rowlocks.put(lockName, r);
2011	    this.leases.createLease(lockName, new
RowLockListener(lockName, region));
2012	    return lockId;
2013	  }


St.Ack

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