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Posted to hdfs-dev@hadoop.apache.org by "Eli Collins (JIRA)" <ji...@apache.org> on 2012/09/08 23:55:07 UTC

[jira] [Created] (HDFS-3907) Allow multiple users for local block readers

Eli Collins created HDFS-3907:
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             Summary: Allow multiple users for local block readers
                 Key: HDFS-3907
                 URL: https://issues.apache.org/jira/browse/HDFS-3907
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node
    Affects Versions: 2.0.0-alpha
            Reporter: Eli Collins
            Assignee: Eli Collins


The {{dfs.block.local-path-access.user}} config added in HDFS-2246 only supports a single user, however as long as blocks are group readable by more than one user the feature could be used by multiple users, to support this we just need to allow both to be configured. In practice this allows us to also support HBase where the client (RS) runs as the hbase system user and the DN runs as hdfs system user. I think this should work secure as well since we're not using impersonation in the HBase case.

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