Fix bug with forked S3PathHandler - #16
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The S3PathHandler suffers from the same problem described here: dask/dask#1292. This commit stores the PID that the client was created for, and refreshes the client if the PID does not match (if the PathManager is now part of a different process).
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@DavidMChan can you elaborate on the use case that exposes this error? |
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Sure - this happens when you're training a model (We're training HuBERT) in fairseq using iopath's S3 manager. It seems like the fork which fairseq executes can cause this SSL error (probably because of the same underlying root cause as the Dask issue above). |
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When using the S3PathHandler in a large number of distributed pytorch dataloaders, you can get errors of the form:
As discussed in dask/dask#1292, this is caused when the PID of the process that owns the client is not the same as the PID of the process that makes the S3 request.
This PR addresses the issue by storing the PID of the client, and refreshing the client when the PIDs no longer match.