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https://issues.apache.org/jira/browse/MAPREDUCE-181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752644#action_12752644
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Hong Tang commented on MAPREDUCE-181:
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Sorry I was not aware of this jira until Devaraj updated MAPREDUCE-841. One
concern I have with regard to pulling user splits from HDFS. There will be a
surge of uncoordinated load from the first wave of maps (and subsequently, 2nd,
3rd ... waves) trying to reading from HDFS the same file. We could either
increase the rep degree of the split file (the number may need to be dependent
on the size of the job). Or we may still let the job tracker to read the raw
bytes of a split from local disk and pass them to the maps.
> Secure job submission
> ----------------------
>
> Key: MAPREDUCE-181
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-181
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Amar Kamat
> Assignee: Amar Kamat
> Attachments: hadoop-3578-branch-20-example-2.patch,
> hadoop-3578-branch-20-example.patch, HADOOP-3578-v2.6.patch,
> HADOOP-3578-v2.7.patch, MAPRED-181-v3.8.patch
>
>
> Currently the jobclient accesses the {{mapred.system.dir}} to add job
> details. Hence the {{mapred.system.dir}} has the permissions of
> {{rwx-wx-wx}}. This could be a security loophole where the job files might
> get overwritten/tampered after the job submission.
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