Fix packages of exceptions catched by gateway manager #5055
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shuichiro-makigaki
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kevin-bates
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Nov 15, 2019
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@shuichiro-makigaki - thank you for these changes! I wonder if something was introduced that prevents restarts or new starts following culling because this should have been seen before. I've confirmed these changes - thanks again!
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@shuichiro-makigaki - would you mind submitting essentially this same PR against jupyter_server? |
`gateway_request` in `gateway.manager` raises `tornado.web.HTTPError` exceptions, but the callers, such as `GatewayKernelManager.get_kernel`, catch `tornado.httpclient.HTTPError`, instead of `tornado.web.HTTPError`. Therefore, the callers can not handle exceptions during gateway interactions. This causes that, for example, when Jupyter Enterprise Gateway culled a kernel by idle timeout, the gateway manager can not handle the kernel's absent appropriately. As a result, notebook users see ambiguous "Kernel Error" and can not restart the kernel or start a new kernel.
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I added some fixes to tests also.
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gateway_requestingateway.managerraisestornado.web.HTTPErrorexceptions, but the callers, such asGatewayKernelManager.get_kernel, catchtornado.httpclient.HTTPError, instead oftornado.web.HTTPError. Therefore, the callers can not handle exceptions during gateway interactions.This causes that, for example, when Jupyter Enterprise Gateway culled a kernel by idle timeout, the gateway manager can not handle the kernel's absent appropriately. As a result, notebook users see ambiguous "Kernel Error" and can not restart the kernel or start a new kernel.