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Posted to mapreduce-dev@hadoop.apache.org by "Devaraj Das (JIRA)" <ji...@apache.org> on 2009/12/10 23:32:18 UTC

[jira] Created: (MAPREDUCE-1288) DistributedCache localizes only once per cache URI

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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