Alejandro Abdelnur created YARN-1404:
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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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