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From Stack <st...@duboce.net>
Subject Re: file is already being created by NN_Recovery
Date Thu, 07 Apr 2011 17:11:45 GMT
The RegionServer is down for sure?  Else it sounds like an issue that
was addressed by the addition of a new short-circuit API call added to
HDFS on the hadoop-0.20-append branch.  The patches that added this
new call went into the branch quite a while ago.   They are:

 HDFS-1554. New semantics for recoverLease. (hairong)

 HDFS-1555. Disallow pipelien recovery if a file is already being
    lease recovered. (hairong)

These patches are not in CDH3b*.  They are in the CDH3 release which
is due any day now.

HBase 0.90.2 makes use of the new API: See
https://issues.apache.org/jira/browse/HBASE-3285.  Attached to that
issue is a patch for CDH3b2, a patch we are running here at SU.  Shout
if you need a version of this patch for CDH3b3/4.

St.Ack


On Thu, Apr 7, 2011 at 9:35 AM, Daniel Iancu <daniel.iancu@1and1.ro> wrote:
> Hello everybody
> We've run into this, now popular, error on our cluster
>
> 2011-04-07 16:28:00,654 WARN IPC Server handler 0 on 8020
> org.apache.hadoop.hdfs.StateChange - DIR* NameSystem.startFile: failed to
> create file
> /hbase/.logs/search-hadoop-eu001.v300.gmx.net,60020,1302075782687/search-hadoop-eu001.v300.gmx.net%3A60020.1302075783467
> for DFSClient_hb_m_search-namenode-eu002.v300.gmx.net:60000_1302186078300 on
> client 10.1.100.32, because this file is already being created by
> NN_Recovery on 10.1.100.61
>
> I've read a couple of threads around it, still it seems that nobody
> pinpointed the cause of it? The only solution here remains to delete the log
> file and lose data ?
>
> I've seen  this error on almost any cluster we've installed so far, deleting
> logs was not concerning since all were test clusters. Now we got this on the
> production cluster, and strange, this cluster was just installed, there is
> no table and no data, no activity there. So what logs is master trying to
> create?
>
> We are running the latest CDH3B4 from Cloudera.
>
> Thanks for any hints,
> Daniel
>

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