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  1. Hadoop Map/Reduce
  2. MAPREDUCE-2845

Default replication level mapred.submit.replication=10 causes warnings on small clusters

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Details

    • Bug
    • Status: Open
    • Minor
    • Resolution: Unresolved
    • 0.20.1
    • None
    • client, distributed-cache
    • None
    • Cloudera CDH 2 (hadoop-0.20 0.20.1+169.127-1~lenny-cdh2)

    • hdfs distributedcache replication jobjar libjars warning fsck

    Description

      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:

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

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            Unassigned Unassigned
            chs-1und1 Christoph Schmitz
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            Dates

              Created:
              Updated: