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https://issues.apache.org/jira/browse/YARN-8080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16470944#comment-16470944
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Chandni Singh commented on YARN-8080:
-------------------------------------
# src/main/java/org/apache/hadoop/yarn/service/api/records/Component.java
Java doc of enum {{RestartPolicyEnum}} ->
{code:java}
/**
* Artifact Type. DOCKER, TARBALL or SERVICE
**/
{code}
# src/main/java/org/apache/hadoop/yarn/service/component/Component.java
{code:java}
static synchronized ComponentState checkIfStable(Component component)
{code}
Is {{synchronized}} necessary? This method is only invoked from transitions
which have acquired the write lock.
> YARN native service should support component restart policy
> -----------------------------------------------------------
>
> Key: YARN-8080
> URL: https://issues.apache.org/jira/browse/YARN-8080
> Project: Hadoop YARN
> Issue Type: Task
> Reporter: Wangda Tan
> Assignee: Suma Shivaprasad
> Priority: Critical
> Attachments: YARN-8080.001.patch, YARN-8080.002.patch,
> YARN-8080.003.patch, YARN-8080.005.patch, YARN-8080.006.patch,
> YARN-8080.007.patch, YARN-8080.009.patch, YARN-8080.010.patch
>
>
> Existing native service assumes the service is long running and never
> finishes. Containers will be restarted even if exit code == 0.
> To support boarder use cases, we need to allow restart policy of component
> specified by users. Propose to have following policies:
> 1) Always: containers always restarted by framework regardless of container
> exit status. This is existing/default behavior.
> 2) Never: Do not restart containers in any cases after container finishes: To
> support job-like workload (for example Tensorflow training job). If a task
> exit with code == 0, we should not restart the task. This can be used by
> services which is not restart/recovery-able.
> 3) On-failure: Similar to above, only restart task with exitcode != 0.
> Behaviors after component *instance* finalize (Succeeded or Failed when
> restart_policy != ALWAYS):
> 1) For single component, single instance: complete service.
> 2) For single component, multiple instance: other running instances from the
> same component won't be affected by the finalized component instance. Service
> will be terminated once all instances finalized.
> 3) For multiple components: Service will be terminated once all components
> finalized.
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