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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4348) Implement communication from ResourceManager to TaskManager
Date Mon, 22 Aug 2016 14:34:21 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15430870#comment-15430870

ASF GitHub Bot commented on FLINK-4348:

Github user tillrohrmann commented on the issue:

    Thanks for your contribution @beyond1920 :-) I've reviewed the PR and I think it would
be good if we split it up into several parts. The first part could be the heartbeat logic
a.k.a. `HeartbeatManager`.   Here we could try to implement a generic sending and receiving
end. I think the implementation can almost be independent of the JM, RM and TE implementation
(similar to `RetryingRegistration`). This will allow us to easily test this component.
    The next step would be the integration of this component into the RM, JM and TE.
    Concerning the slot request logic I think we should wait a little bit for the `SlotManager`
implementation. It could be the case that the `SlotManager` will make the rpcs to the `TaskExecutor`
and not the RM. But for the moment the interface is, afaik, not well enough specified to program
against it.
    The failure notification should also be treated in a separate PR imo. The notification
can have multiple origins (e.g. `HeartbeatManager` or the resource management framework) and
should be designed in such a way.
    In general, I think the components should be more thoroughly tested with more fine-grained
unit tests. Furthermore, I think it would be good if we could revise the code documentation
a little bit.

> Implement communication from ResourceManager to TaskManager
> -----------------------------------------------------------
>                 Key: FLINK-4348
>                 URL: https://issues.apache.org/jira/browse/FLINK-4348
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Cluster Management
>            Reporter: Kurt Young
>            Assignee: zhangjing
> There are mainly 3 logics initiated from RM to TM:
> * Heartbeat, RM use heartbeat to sync with TM's slot status
> * SlotRequest, when RM decides to assign slot to JM, should first try to send request
to TM for slot. TM can either accept or reject this request.
> * FailureNotify, in some corner cases, TM will be marked as invalid by cluster manager
master(e.g. yarn master), but TM itself does not realize. RM should send failure notify to
TM and TM can terminate itself

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