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From "Sidharta Seethana (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3853) Add docker container runtime support to LinuxContainterExecutor
Date Fri, 10 Jul 2015 00:08:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-3853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14621483#comment-14621483

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"
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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