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Fix race condition with async kernel management #472

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Apr 9, 2021
Merged

Fix race condition with async kernel management #472

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14 changes: 11 additions & 3 deletions jupyter_server/services/kernels/kernelmanager.py
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Original file line number Diff line number Diff line change
Expand Up @@ -313,7 +313,12 @@ def shutdown_kernel(self, kernel_id, now=False, restart=False):
type=self._kernels[kernel_id].kernel_name
).dec()

return self.pinned_superclass.shutdown_kernel(self, kernel_id, now=now, restart=restart)
self.pinned_superclass.shutdown_kernel(self, kernel_id, now=now, restart=restart)
# Unlike its async sibling method in AsyncMappingKernelManager, removing the kernel_id
# from the connections dictionary isn't as problematic before the shutdown since the
# method is synchronous. However, we'll keep the relative call orders the same from
# a maintenance perspective.
self._kernel_connections.pop(kernel_id, None)

async def restart_kernel(self, kernel_id, now=False):
"""Restart a kernel by kernel_id"""
Expand Down Expand Up @@ -388,8 +393,11 @@ def list_kernels(self):
kernels = []
kernel_ids = self.pinned_superclass.list_kernel_ids(self)
for kernel_id in kernel_ids:
model = self.kernel_model(kernel_id)
kernels.append(model)
try:
model = self.kernel_model(kernel_id)
kernels.append(model)
except (web.HTTPError, KeyError):
pass # Probably due to a (now) non-existent kernel, continue building the list
return kernels

# override _check_kernel_id to raise 404 instead of KeyError
Expand Down