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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2049) JT and TT should prune invalid local dirs on startup
Date Thu, 02 Sep 2010 04:55:53 GMT
JT and TT should prune invalid local dirs on startup

                 Key: MAPREDUCE-2049
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2049
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobtracker, tasktracker
    Affects Versions: 0.21.0, 0.22.0
            Reporter: Eli Collins
            Priority: Minor
             Fix For: 0.21.1, 0.22.0

MRAsyncDiskService fails when it's given local dirs it can't create or write. Per MAPREDUCE-1213
this conflicts with the previous behavior. The TTs will no longer start on hosts where the
config has localdirs that can not be created (ie if some hosts don't have the same local mounts).

The TT and JT should prune out invalid local dirs (ones that fail checkLocalDirs ie that it
can not create) before giving them to MRAsyncDiskService and using them otherwise.

Also mapred-default.xml states that mapred.local.dir that do not exist are ignored, this should
be updated as directories that don't exist are created (if possible), they're only ignored
if they can not be created. 

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