FAQ
I re ran into this problem yesterday, and just thought I'd share the
cause for the record.

After looking through my logs, I was seeing a bunch of exceptions
trying to bound to already in use ports. As a result, the namenode
and jobtracker were failing to launch, which I had not noticed. In
fact, jps reported that they were not running. But in reality, they
were running, as some sort of zombie process on my system, which was
blocking the startup. After killing the processes, everything went
back to working well.
On Sep 19, 2007, at 2:59 PM, Owen O'Malley wrote:

On Sep 19, 2007, at 2:30 PM, Ross Boucher wrote:

Specifically, the job starts, and then each task that is scheduled
fails, with the following error:

Error initializing task_0007_m_000063_0:
java.io.IOException: /DFS_ROOT/tmp/mapred/system/submit_i849v1/
job.xml: No such file or directory
Look at the configuration of your mapred.system.dir. It MUST be the
same on both the cluster and submitting node. Note that
mapred.system.dir must be in the default file system, which must
also be the same on the cluster and submitting node. Note that
there is a jira (HADOOP-1100) that would have the cluster pass the
system directory to the client, which would get rid of this issue.

-- Owen

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postedSep 19, '07 at 9:31p
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