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https://issues.apache.org/jira/browse/MAPREDUCE-2845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096751#comment-13096751
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Harsh J commented on MAPREDUCE-2845:
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The property 'mapred.submit.replication' is configurable for that reason; or is
this a request to lower that value?
Indeed, this would also hamper decommissioning efforts when an admin doesn't
know about it.
I think making it dynamic makes sense, but adds RPC overheads possibly, per
submission.
> 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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