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https://issues.apache.org/jira/browse/TWILL-240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16097042#comment-16097042
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Chengfeng Mao commented on TWILL-240:
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Proposing to add the following methods to {{EventHandler}} class:
# {{started(String twillAppName, RunId runId)}}
#* at the end of AM {{doStart()}} method
# {{containerLaunched(String twillAppName, RunId runId, int instanceId)}}
#* when a container is launched to run a runnable
# {{completed(String twillAppName, RunId runId)}}
#* when all containers complete with exit code 0
# killed(String twillAppName, RunId runId)
#* when the TwillApp is stopped by a stop message
> Allow running application specific code in Application Master
> --------------------------------------------------------------
>
> Key: TWILL-240
> URL: https://issues.apache.org/jira/browse/TWILL-240
> Project: Apache Twill
> Issue Type: New Feature
> Reporter: Chengfeng Mao
>
> Application Master should be able to run application specific code. For
> instance, an app can attach a custom handler to the application lifecycle.
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