getCatalog can be called from the driver, and can return null #562
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Closes #556
When unregistering shuffles we blindly call
unregisterGpuShuffle
from the driver or executor. This depends on a lazy val that needs aGpuShuffleEnv
initialized (we need RMM for our storage, and the driver doesn't have RMM/CUDA so we don't have storage and therefore theGpuShuffleEnv
is never initialized). This makes the driver not fail with an NPE in this case as the shuffle manager already was checking for a null catalog.