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From "zhangjing (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4478) Implement heartbeat logic
Date Thu, 25 Aug 2016 02:46:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15436167#comment-15436167

zhangjing commented on FLINK-4478:

[~till.rohrmann]. I agree we should define how should it look like first. And I try to give
my opinions for your question. Here's my thought, What's your advice?
1. exponential backoff strategy.

In fact, it is not complete exponential backoff. like 'Math.min(2 * timeoutMillis, maxHeartbeatTimeout)',
Maybe we could use maxHeartbeatTimeout to decrease the risk of wait twice as long as defined
until notified about a heartbeat failure.
Also we could use constant retry period instead of backoff strategy
2. whether every heartbeat connection should be responsible for triggering itself or whether
the heartbeat manager should be responsible for that?
Every heartbeat scheduler don't trigger itself, it depends on outer world(Here i means HeartbeatManager)
call it's start method to trigger it.

3. Is the heartbeat receiving end an independent RpcEndpoint? How does the payload delivery
works? Does the sender side asks for the result (future) or does the receiving side answers
via a tell message to the heartbeat manager?
On the sender side, receiving end is a gateway which can be got by its address. And Sender
side ask receiver for the heartbeat payload.
4. How does receiving end monitor the sender so that if the heartbeat request is not delivered,
then receiving end could mark sending end as dead?
I think it could be independent of heartbeat manager on the sending side. It should run on
the receiving end while heartbeat scheduler run on the sending side.

> Implement heartbeat logic
> -------------------------
>                 Key: FLINK-4478
>                 URL: https://issues.apache.org/jira/browse/FLINK-4478
>             Project: Flink
>          Issue Type: Improvement
>          Components: Distributed Coordination
>    Affects Versions: 1.1.0
>            Reporter: Till Rohrmann
>             Fix For: 1.2.0
> Parent issue to track the development of the heartbeat logic (sender and receiver) for
the new Flip-6 refactoring.

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