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[ZEPPELIN-3978] Change Jetty Server to use QueuedThreadPool and make it configurable #3294
What is this PR for?
By default Jetty Server only supports 200 threads.
That could cause slowness or stuck because users could not receive WebSocket message.
Add configurable param feature to scale up the performance for Single Zeppelin Server whenever needs it
What type of PR is it?
What is the Jira issue?
How should this be tested?
Screenshots (if appropriate)
can you take a look at the test failures? https://travis-ci.org/fred521/zeppelin/builds/486180306
checked it and re-run for a few times, each time actually taking for 30mins to 1 hour.
And I feel that will stop a lot of contributors, can Apache Zeppelin Community improve this?
Otherwise, new contributors will feel wasting time to spend effort here.