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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13817) Add a finite shell command timeout to ShellBasedUnixGroupsMapping
Date Thu, 16 Feb 2017 18:35:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15870471#comment-15870471

Wei-Chiu Chuang commented on HADOOP-13817:

Okay I did a quick review and there were only two nits after Xiaoyu's numerous reviews.
By the way, Yetus does not support precommit check if the patch is a github pull request,
right? I am not sure how to make that happen... Maybe attach a patch into this jira would
trigger that.

> Add a finite shell command timeout to ShellBasedUnixGroupsMapping
> -----------------------------------------------------------------
>                 Key: HADOOP-13817
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13817
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 2.6.0
>            Reporter: Harsh J
>            Assignee: Harsh J
>            Priority: Minor
> The ShellBasedUnixGroupsMapping run various {{id}} commands via the ShellCommandExecutor
modules without a timeout set (its set to 0, which implies infinite).
> If this command hangs for a long time on the OS end due to an unresponsive groups backend
or other reasons, it also blocks the handlers that use it on the NameNode (or other services
that use this class). That inadvertently causes odd timeout troubles on the client end where
its forced to retry (only to likely run into such hangs again with every attempt until at
least one command returns).
> It would be helpful to have a finite command timeout after which we may give up on the
command and return the result equivalent of no groups found.

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