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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7416) Implement Netty receiver outgoing pipeline for credit-based
Date Mon, 04 Dec 2017 16:23:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277035#comment-16277035
] 

ASF GitHub Bot commented on FLINK-7416:
---------------------------------------

Github user NicoK commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4533#discussion_r154697358
  
    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/RemoteInputChannel.java
---
    @@ -378,6 +381,11 @@ public void notifyBufferDestroyed() {
     		// Nothing to do actually.
     	}
     
    +	@VisibleForTesting
    +	public void increaseCredit(int credit) {
    --- End diff --
    
    or how about recycling a `Buffer` instance into the channel via `RemoteInputChannel#recycle()?
 That would also be part of the current interface and yield the same result but is a bit more
hacky (but similar to calling `onSenderBacklog` with the advantage being closer to your `increaseCredit`
method).


> Implement Netty receiver outgoing pipeline for credit-based
> -----------------------------------------------------------
>
>                 Key: FLINK-7416
>                 URL: https://issues.apache.org/jira/browse/FLINK-7416
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Network
>            Reporter: zhijiang
>            Assignee: zhijiang
>             Fix For: 1.5.0
>
>
> This is a part of work for credit-based network flow control.
> The related works are :
> *  We define a new message called {{AddCredit}} to notify the incremental credit during
data shuffle. 
> * Whenever an {{InputChannel}}’s unannounced credit goes up from zero, the channel
is enqueued in the pipeline.
> * Whenever the channel becomes writable, it takes the next {{InputChannel}} and sends
its unannounced credit. The credit is reset to zero after each sent.
> * That way, messages are sent as often as the network has capacity and contain as much
credit as available for the channel at that point in time. Otherwise, it would only add latency
to the announcements and not increase throughput.



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