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From "Zian Chen (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (YARN-8763) Add WebSocket logic to the Node Manager web server to establish servlet
Date Sat, 06 Oct 2018 00:02:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16640482#comment-16640482
] 

Zian Chen edited comment on YARN-8763 at 10/6/18 12:01 AM:
-----------------------------------------------------------

[~eyang] sorry for getting back late. I'm curious why TestContainerManager been triggered
too. Anyway, i tried the patch 004 locally and TestContainerManager UTs all passed, And I
updated patch 005 with your suggestions. Let's see how patch-005 goes.


was (Author: zian chen):
[~eyang] sorry for getting back late. I'm curious why TestContainerManager been triggered
too. Anyway, i tried the patch 003 locally and TestContainerManager UTs all passed, And I
updated patch 004 with your suggestions. Let's see how patch-004 goes.

> Add WebSocket logic to the Node Manager web server to establish servlet
> -----------------------------------------------------------------------
>
>                 Key: YARN-8763
>                 URL: https://issues.apache.org/jira/browse/YARN-8763
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Zian Chen
>            Assignee: Zian Chen
>            Priority: Major
>              Labels: Docker
>         Attachments: YARN-8763-001.patch, YARN-8763.002.patch, YARN-8763.003.patch, YARN-8763.004.patch
>
>
> The reason we want to use WebSocket servlet to serve the backend instead of establishing
the connection through HTTP is that WebSocket solves a few issues with HTTP which needed for
our scenario,
>  # In HTTP, the request is always initiated by the client and the response is processed
by the server — making HTTP a unidirectional protocol, while web socket provides the
Bi-directional protocol which means either client/server can send a message to the other party.
>  # Full-duplex communication — client and server can talk to each other independently
at the same time
>  # Single TCP connection — After upgrading the HTTP connection in the beginning,
client and server communicate over that same TCP connection throughout the lifecycle of WebSocket
connection



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