Improve error when credentials are not provided about sparkmagic HOT 7 CLOSED

This is true for other errors (when Livy returns 502 for example). We need to surface all of them.

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Good point. We already have the machinery in place to catch and display errors when Livy times out so we should leverage the same strategy for these.

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Ricky, will you tackle other errors too?

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I haven't seen any other errors. I did a quick test by pointing the magics to an incorrect URL and the error I got for that was sensible.

I don't know how to force Livy to return a 502 to me so I couldn't test that scenario in particular.

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Just go to a cluster and shut Livy down. Gateway will return 502.
Or point it to a non-Spark cluster.

Was the error you got surfaced to the user? In the past, I saw it not being surfaced to the user (just displayed in shell) and cell never returned.

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Let me give it a shot

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The kernel doesn't crash when the gateway returns 502. (This makes sense since we only try to connect to Livy after running the first cell.)

I am going to close this issue because I don't think any of us know of any situations where the error still happens.

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