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https://issues.apache.org/jira/browse/MAPREDUCE-3162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13124696#comment-13124696
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Chris Douglas commented on MAPREDUCE-3162:
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bq. startContainer can be called concurrently from several threads, apparently.
So one thread can insert the ApplicationImpl in the concurrent applications
map, then another thread can send the INIT_CONTAINER event before the
INIT_APPLICATION event has been sent.
That was the intent. It should also be legal for the NM to clean up application
state, given a richer set of semantics for the intermediate output specifying
retention. Then one would have to re-init the application to start containers
there. More of the init used to be per-application, before changing the
localization to be per-container. It's not doing much now, but it's cheap.
> Separate application-init and container-init event types in NM's
> ApplicationImpl FSM
> ------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-3162
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3162
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Minor
> Attachments: mr-3162.txt
>
>
> Currently, the ApplicationImpl receives an INIT_APPLICATION event on every
> container initialization. Only on the first one does it really mean to init
> the application, whereas all subsequent events are for specific containers.
> This JIRA is to separate the events into INIT_APPLICATION, sent once and only
> once per application, and INIT_CONTAINER, which is sent for every container.
> The first container sends INIT_APPLICATION followed by INIT_CONTAINER.
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