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https://issues.apache.org/jira/browse/HADOOP-13817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15694982#comment-15694982
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Harsh J commented on HADOOP-13817:
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[~xyao] - Thanks for the reviews so far. Could you take a look at the current
patch-set?
[~yzhangal] - Could you help take a look at this one?
> 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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