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From "Craig Condit (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-8638) Allow linux container runtimes to be pluggable
Date Thu, 09 Aug 2018 01:18:00 GMT
Craig Condit created YARN-8638:
----------------------------------

             Summary: Allow linux container runtimes to be pluggable
                 Key: YARN-8638
                 URL: https://issues.apache.org/jira/browse/YARN-8638
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: nodemanager
    Affects Versions: 3.2.0
            Reporter: Craig Condit


YARN currently supports three different Linux container runtimes (default, docker, and javasandbox).
However, it would be relatively straightforward to support arbitrary runtime implementations.
This would enable easier experimentation with new and emerging runtime technologies (runc,
containerd, etc.) without requiring a rebuild and redeployment of Hadoop. 

This could be accomplished via a simple configuration change:
{code:xml}
<property>
 <name>yarn.nodemanager.runtime.linux.allowed-runtimes</name>
 <value>default,docker,experimental</value>
</property>
 
<property>
 <name>yarn.nodemanager.runtime.linux.experimental.class</name>
 <value>com.somecompany.yarn.runtime.ExperimentalLinuxContainerRuntime</value>
</property>{code}
 

In this example, {{yarn.nodemanager.runtime.linux.allowed-runtimes}} would now allow arbitrary
values. Additionally, {{yarn.nodemanager.runtime.linux.\{RUNTIME_KEY}.class}} would indicate
the {{LinuxContainerRuntime}} implementation to instantiate. A no-argument constructor should
be sufficient, as {{LinuxContainerRuntime}} already provides an {{initialize()}} method.

{{DockerLinuxContainerRuntime.isDockerContainerRequested(Map<String, String> env)}}
and {{JavaSandboxLinuxContainerRuntime.isSandboxContainerRequested()}} could be generalized
to {{isRuntimeRequested(Map<String, String> env)}} and added to the {{LinuxContainerRuntime}} interface.
This would allow {{DelegatingLinuxContainerRuntime}} to select an appropriate runtime based
on whether that runtime claimed ownership of the current container execution.

For backwards compatibility, the existing values (default,docker,javasandbox) would continue
to be supported as-is. Under the current logic, the evaluation order is javasandbox, docker,
default (with default being chosen if no other candidates are available). Under the new evaluation
logic, pluggable runtimes would be evaluated after docker and before default, in the order
in which they are defined in the allowed-runtimes list. This will change no behavior on current
clusters (as there would be no pluggable runtimes defined), and preserves behavior with respect
to ordering of existing runtimes.



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