Sidharta Seethana commented on YARN-3853:

The test failures are unrelated to this patch. A few of the checkstyle issues 
seem to be valid (e.g indentation). I'll fix those with the next iteration of 
the patch based on code-review feedback. Thanks


> Add docker container runtime support to LinuxContainterExecutor
> ---------------------------------------------------------------
>                 Key: YARN-3853
>                 URL: https://issues.apache.org/jira/browse/YARN-3853
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn
>            Reporter: Sidharta Seethana
>            Assignee: Sidharta Seethana
>         Attachments: YARN-3853.001.patch
> Create a new DockerContainerRuntime that implements support for docker 
> containers via container-executor. LinuxContainerExecutor should default to 
> current behavior when launching containers but switch to docker when 
> requested. 
> Overview
> ===
> The current mechanism of launching/signaling containers is moved to its own 
> (default) container runtime. In order to use docker container runtime a 
> couple of environment variables have to be set. This will have to be 
> revisited when we have a first class client side API to specify different 
> container types and associated parameters. Using ‘pi’ as an example and using 
> a custom docker image, this is how you could use the docker container runtime 
> (LinuxContainerExecutor must be in use and the docker daemon needs to be 
> running) :
> {code}
> export 
> YARN_EXAMPLES_JAR=./share/hadoop/mapreduce/hadoop-mapreduce-examples-*.jar
> bin/yarn jar $YARN_EXAMPLES_JAR pi 
> -Dmapreduce.map.env="YARN_CONTAINER_RUNTIME_TYPE=docker,YARN_CONTAINER_RUNTIME_DOCKER_IMAGE=ashahab/hadoop-trunk"
> -Dyarn.app.mapreduce.am.env="YARN_CONTAINER_RUNTIME_TYPE=docker,YARN_CONTAINER_RUNTIME_DOCKER_IMAGE=ashahab/hadoop-trunk"
> -Dmapreduce.reduce.env="YARN_CONTAINER_RUNTIME_TYPE=docker,YARN_CONTAINER_RUNTIME_DOCKER_IMAGE=ashahab/hadoop-trunk"
>  4 1000
> {code}
> LinuxContainerExecutor can delegate to either runtime on a per container 
> basis. If the docker container type is selected, LinuxContainerExecutor 
> delegates to the DockerContainerRuntime which in turn uses docker support in 
> the container-executor binary to launch/manage docker containers ( see 
> YARN-3852 ) . 

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