[jira] [Commented] (YARN-8763) Add WebSocket logic to the Node Manager web server to establish servlet

["Zian Chen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-8763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16634486#comment-16634486 ] 

Zian Chen commented on YARN-8763:
---------------------------------

Hi [~eyang] , make sense.  I'll work on patch 003 to address comments & Jenkins failures. 

> 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
>
>
> 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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