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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-8763) Add WebSocket logic to the Node Manager web server to establish servlet
Date Wed, 03 Oct 2018 15:47:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-8763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16637100#comment-16637100

Eric Yang commented on YARN-8763:

[~Zian Chen] Thank you for the patch.  A few minor problems:


I think it should be written as:


As far as I can tell, $containerId is not used in the code, nor the correct way to express
WebServlet annotation expression.

ContainerShellClientSocket needs to be renamed to ContainerShellClientSocketTest for testing
purpose only.  We need to write a real version of ContainerShellClientSocket in src/main in

Check style and findbugs errors needs to be cleaned up.  The rest of the patch looks good.

> 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
> 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

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