Harsh J created HADOOP-13817:
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Summary: 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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