That has been a problem before. But I see Jon has already filed a jira for this.
> From: Todd Lipcon > Subject: Re: HBase client hangs after upgrade to 0.20.4 when used from reducer > > It appears like we might be stuck in an infinite loop here: > > "IPC Server handler 9 on 60020" daemon prio=10 > tid=0x00002aaeb42f7800 > nid=0x6508 runnable [0x00000000445bb000] > java.lang.Thread.State: RUNNABLE > at > org.apache.hadoop.hbase.regionserver.ExplicitColumnTracker.checkColumn(ExplicitColumnTracker.java:128) > at > org.apache.hadoop.hbase.regionserver.ScanQueryMatcher.match(ScanQueryMatcher.java:165) > at > org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:176)
