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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 Fri, 01 Dec 2017 13:14:01 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16274367#comment-16274367
] 

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_r154318828
  
    --- 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 --
    
    I think we can live without this method that should never be called outside the tests
(since it modifies state): creating a `BufferResponse` with an appropriate backlog should
yield the same result in the tests


> 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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