[jira] [Commented] (YARN-3853) Add docker container runtime support to LinuxContainterExecutor

["Sidharta Seethana (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-3853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621353#comment-14621353 ] 

Sidharta Seethana commented on YARN-3853:
-----------------------------------------

Updated the description to provide an overview of control flow.

> 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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