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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-1404) Add support for unmanaged containers
Date Tue, 12 Nov 2013 14:21:17 GMT
Alejandro Abdelnur created YARN-1404:

             Summary: Add support for unmanaged containers
                 Key: YARN-1404
                 URL: https://issues.apache.org/jira/browse/YARN-1404
             Project: Hadoop YARN
          Issue Type: New Feature
          Components: nodemanager
    Affects Versions: 2.2.0
            Reporter: Alejandro Abdelnur
            Assignee: Alejandro Abdelnur

Currently a container allocation requires to start a container process with the corresponding
NodeManager's node.

For applications that need to use the allocated resources out of band from Yarn this means
that a dummy container process must be started.

Impala/Llama is an example of such application which is currently starting a 'sleep 10y' (10
years) process as the container process. And the resource capabilities are used out of by
and the Impala process collocated in the node. The Impala process ensures the processing associated
to that resources do not exceed the capabilities of the container. Also, if the container
is lost/preempted/killed, Impala stops using the corresponding resources.

In addition, in the case of Llama, the current requirement of having a container process,
gets complicates when hard resource enforcement (memory -ContainersMonitor- or cpu -via cgroups-)
is enabled because Impala/Llama request resources with CPU and memory independently of each
other. Some requests are CPU only and others are memory only. Unmanaged containers solve this
problem as there is no underlying process with zero CPU or zero memory.

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