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https://issues.apache.org/jira/browse/MAPREDUCE-181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754002#action_12754002
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Amar Kamat commented on MAPREDUCE-181:
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bq. _version that contains the storage version (1.0 to start with)
Why cant this be in the respective files as headers? Today we add the version
info as the first line in the file.
bq. The JobTracker doesn't need to do any writes to HDFS, just reads
So you mean to say that we just persist jobid and job-staging location for
restart/persistence? Also the jobtracker will be forced do all the checks for
job upon restart as the job files can change anytime. Also this is a change
from the current model where the files once accepted cannot change. User now
can change the jobconf while the job is running.
> 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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