Jian He commented on YARN-1368:

[~tucu00], Please understand that the patch uploaded here is completely 
different from the prototype patch on YARN-556. The patch here is using a 
different approach to cover all schedulers and also the whole container 
recovery flow is different which simplifies things a lot. This jira itself was 
originally opened as “RM should populate running container allocation 
information from NM resync” and did not cover recovering the schedulers. I 
should have opened a new jira to express the approaches instead of renaming 
this one to avoid confusion.

> Common work to re-populate containers’ state into scheduler
> -----------------------------------------------------------
>                 Key: YARN-1368
>                 URL: https://issues.apache.org/jira/browse/YARN-1368
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Bikas Saha
>            Assignee: Jian He
>         Attachments: YARN-1368.1.patch, YARN-1368.combined.001.patch, 
> YARN-1368.preliminary.patch
> YARN-1367 adds support for the NM to tell the RM about all currently running 
> containers upon registration. The RM needs to send this information to the 
> schedulers along with the NODE_ADDED_EVENT so that the schedulers can recover 
> the current allocation state of the cluster.

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