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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7214) Hadoop /usr/bin/groups equivalent
Date Sat, 02 Apr 2011 00:01:10 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014888#comment-13014888
] 

Aaron T. Myers commented on HADOOP-7214:
----------------------------------------

I did a little digging into this and the ideal implementation is not as obvious to me as I
anticipated. Here's a few ideas:

# Given that both the NN and the JT do user -> group resolution, it'd be nice to implement
this in a way common to both of them. This suggests creating a new protocol common to both
just for this purpose, and adding a new option to {{`hadoop'}} along the lines of {{`hadoop
groups <host:port> [username...]'}}.
\\
# The hadoop filesystem client {{i.e. `hadoop fs'}} already has commands which assume the
existence of groups (e.g. `hadoop fs -chgrp'.) It therefore seems natural to implement this
as a new method in FileSystem and to add a new option to {{`hadoop fs'}} along the lines of
{{`hadoop fs -groups <host:port> [username...]'}}. This also seems natural since most
file system implementations already deal with groups and have an obvious way of performing
user -> group mapping.
\\
# We could implement this as just a servlet, along the lines of {{`hadoop daemonlog'}}.

Option #1 seems like it might be a little too heavyweight for this purpose. The trouble with
option #2 is that there's presently no M/R analog to {{`hadoop fs'}} like, for example, {{`hadoop
mr'}}. I don't actually think option #3 is a good idea at all, but I listed it here for completeness.

Any thoughts? I'm certainly open to any options not listed here.

> Hadoop /usr/bin/groups equivalent
> ---------------------------------
>
>                 Key: HADOOP-7214
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7214
>             Project: Hadoop Common
>          Issue Type: New Feature
>    Affects Versions: 0.23.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>
> Since user -> groups resolution is done on the NN and JT machines, there should be
a way for users to determine what groups they're a member of from the NN's and JT's perspective.

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