Add better error handling for non-rank 0 during Monolithic Checkpoint Loading #3647
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What does this PR do?
Previously, all rank's 1 - N would return a File not Found Error when local rank 0 failed to download the monolithic checkpoint resulting in a confusing debugging experience.
This new logic changes the exception on non global rank 0's to raise an Error that points users to look at the local rank 0 for better debugging experience.
What issue(s) does this change relate to?
https://databricks.atlassian.net/browse/GRT-3308
Tests
EXTRA_ARGS='-vv -k test_load_incorrect_path' WORLD_SIZE=2 make test-dist-gpu