DistributedCache localizes only once per cache URI
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Key: MAPREDUCE-1288
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1288
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: security, tasktracker
Affects Versions: 0.21.0
Reporter: Devaraj Das
Priority: Blocker
Fix For: 0.21.0
As part of the file localization the distributed cache localizer creates a copy
of the file in the corresponding user's private directory. The localization in
DistributedCache assumes the key as the URI of the cachefile and if it already
exists in the map, the localization is not done again. This means that another
user cannot access the same distributed cache file. We should change the key to
include the username so that localization is done for every user.
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