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MapReduce >> mail # user >> Lost Task Tracker because of no heartbeat

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Re: Lost Task Tracker because of no heartbeat
On Thu, 2011-03-17 at 00:19 +0530, Harsh J wrote:
> On Thu, Mar 17, 2011 at 12:42 AM, Marcos Ortiz <[EMAIL PROTECTED]> wrote:
> > 2011-03-15 01:18:44,468 INFO org.apache.hadoop.mapred.JobTracker:
> > problem cleaning system directory:
> > hdfs://localhost:9000/cygwin/usr/local/hadoop-datastore/hadoop-Baran/mapred/system
> > org.apache.hadoop.ipc.RemoteException:
> > org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot
> > delete /cygwin/usr/local/hadoop-datastore/hadoop-Baran/mapred/system.
> > Name node is in safe mode.
> Marcos, the JT keeps attempting to clear the mapred.system.dir on the
> DFS at startup, and fails because the NameNode wasn't ready when it
> tried (and thereby reattempts after a time, and passes later when NN
> is ready for some editing action). This is mostly because Baran is
> issuing a start-all/stop-all instead of a simple start/stop of mapred
> components.
Thanks a lot, Harsh for the response.
I think that's a good entry to add to the Problems/Solutions section on
the Hadoop Wiki.

 Marcos Luís Ortíz Valmaseda
 Software Engineer
 Centro de Tecnologías de Gestión de Datos (DATEC)
 Universidad de las Ciencias Informáticas