Link issue on using `async` with `executor_submit`
@@ -2333,6 +2333,7 @@ class Worker(ServerNode):
################
# FIXME: this breaks if changed to async def...
+ # xref: https://github.com/dask/distributed/issues/3938
@gen.coroutine
def executor_submit(self, key, function, args=(), kwargs=None, executor=None):
""" Safely run function in thread pool executor
