configure_hadoop should create+chown all data dirs listed in 
hadoop-hdfs.dfs.data.dir
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                 Key: WHIRR-351
                 URL: https://issues.apache.org/jira/browse/WHIRR-351
             Project: Whirr
          Issue Type: Improvement
          Components: service/hadoop
    Affects Versions: 0.6.0
            Reporter: Karel Vervaeke
            Priority: Minor


If the directories listed in dfs.data.dir do not exist, 
the datanodes will try to create them. This fails if the hadoop user
has sufficient permissions.
To avoid the problem, the directories should be created before starting the 
datanodes.

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