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From "Christoph Schmitz (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2845) Default replication level mapred.submit.replication=10 causes warnings on small clusters
Date Tue, 16 Aug 2011 06:54:27 GMT
Default replication level mapred.submit.replication=10 causes warnings on small clusters
----------------------------------------------------------------------------------------

                 Key: MAPREDUCE-2845
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2845
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: client, distributed-cache
    Affects Versions: 0.20.1
         Environment: Cloudera CDH 2 (hadoop-0.20 0.20.1+169.127-1~lenny-cdh2)
            Reporter: Christoph Schmitz
            Priority: Minor


By default, the replication level for job jars, libjars and the distributed cache in general
is mapred.submit.replication=10. This yields under-replication warnings for these files on
small clusters (less than 10 data nodes) when using fsck ("hadoop fsck") on their HDFS.

Example on an 8-node cluster:

{quote}
/tmp/hadoop/mapred/system/job_201105191458_1857/job.jar:  Under replicated blk_-6996370258385460742_366223.
Target Replicas is 10 but found 8 replica(s).
{quote}

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