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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-1137) Add support whitelist for system users to Yarn container-executor.c
Date Tue, 03 Sep 2013 21:13:51 GMT
Alejandro Abdelnur created YARN-1137:
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             Summary: Add support whitelist for system users to Yarn container-executor.c
                 Key: YARN-1137
                 URL: https://issues.apache.org/jira/browse/YARN-1137
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: nodemanager
    Affects Versions: 2.1.0-beta
            Reporter: Alejandro Abdelnur
            Assignee: Roman Shaposhnik


Currently container-executor.c has a banned set of users (mapred, hdfs & bin) and configurable
min.user.id (defaulting to 1000).

This presents a problem for systems that run as system users (below 1000) if these systems
want to start containers.

Systems like Impala fit in this category. A (local) 'impala' system user is created when installing
Impala on the nodes. 

Note that the same thing happens when installing system like HDFS, Yarn, Oozie, from packages
(Bigtop); local system users are created.

For Impala to be able to run containers in a secure cluster, the 'impala' system user must
whitelisted. 

For this, adding a configuration 'allowed.system.users' option in the container-executor.cfg
and the logic in container-executor.c would allow the usernames in that list.

Because system users are not guaranteed to have the same UID in different machines, the 'allowed.system.users'
property should use usernames and not UIDs.


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