+ # The following methods retry on OSError. This is intended to mitigate bug
+ # #6321 where fork() of node manager raises "OSError: [Errno 12] Cannot
+ # allocate memory" resulting in the untimely death of the shutdown actor
+ # and tends to result in node manager getting into a wedged state where it
+ # won't allocate new nodes or shut down gracefully. The underlying causes
+ # of the excessive memory usage that result in the "Cannot allocate memory"
+ # error are still being investigated.
+