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https://issues.apache.org/jira/browse/YARN-8763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16639006#comment-16639006
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Eric Yang commented on YARN-8763:
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[~Zian Chen] DefaultContainerExecutor execContainer method is causing
TestContainerManager unit test to fail. If the method returns null instead of
throwing ContainerExecutionException, then the test passed. Not sure why
execContainer method is getting triggered in TestContainerManager test.
> 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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