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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

    • Type: Bug
    • Status: Open
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: 0.20.1
    • Fix Version/s: None
    • Component/s: client, distributed-cache
    • Labels:
      None
    • Environment:

      Cloudera CDH 2 (hadoop-0.20 0.20.1+169.127-1~lenny-cdh2)

    • Tags:
      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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            • Assignee:
              Unassigned
              Reporter:
              chs-1und1 Christoph Schmitz
            • Votes:
              2 Vote for this issue
              Watchers:
              5 Start watching this issue

              Dates

              • Created:
                Updated: