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https://issues.apache.org/jira/browse/YARN-8763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16609917#comment-16609917
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Zian Chen commented on YARN-8763:
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Provide initial patch for this.
> 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
>
> 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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