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Posted to yarn-issues@hadoop.apache.org by "Suma Shivaprasad (JIRA)" <ji...@apache.org> on 2019/01/04 18:59:00 UTC
[jira] [Commented] (YARN-8489) Need to support "dominant" component
concept inside YARN service
[ https://issues.apache.org/jira/browse/YARN-8489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16734482#comment-16734482 ]
Suma Shivaprasad commented on YARN-8489:
----------------------------------------
Thanks [~yuan_zac] A couple f comments
1. Please modify javadoc to clarify that if dominant component terminates, the service is also terminated.
/**
959 * If the service state component is finished, The service will be terminated.
960 * @param component
961 */
2. Pls add docs for this new property
> Need to support "dominant" component concept inside YARN service
> ----------------------------------------------------------------
>
> Key: YARN-8489
> URL: https://issues.apache.org/jira/browse/YARN-8489
> Project: Hadoop YARN
> Issue Type: Task
> Components: yarn-native-services
> Reporter: Wangda Tan
> Assignee: Zac Zhou
> Priority: Major
> Attachments: YARN-8489.001.patch, YARN-8489.002.patch, YARN-8489.003.patch
>
>
> Existing YARN service support termination policy for different restart policies. For example ALWAYS means service will not be terminated. And NEVER means if all component terminated, service will be terminated.
> The name "dominant" might not be most appropriate , we can figure out better names. But in simple, it means, a dominant component which final state will determine job's final state regardless of other components.
> Use cases:
> 1) Tensorflow job has master/worker/services/tensorboard. Once master goes to final state, no matter if it is succeeded or failed, we should terminate ps/tensorboard/workers. And the mark the job to succeeded/failed.
> 2) Not sure if it is a real-world use case: A service which has multiple component, some component is not restartable. For such services, if a component is failed, we should mark the whole service to failed.
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