Zian Chen created YARN-8763:
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Summary: 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
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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