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Distributed I/O hangs when the number of processes is larger than the split axis length #339

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@ljgray

During collective hdf5 reads, if the distributed axis is smaller than the number of processes, the I/O can hang on the processes with an empty slice. Possibly related to #165, but it could also be a separate issue.

I seem to remember running into (and resolving) this issue in the past, so it's possible that there was a regression at some point.

Needs further testing.

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bugpriority/mediumThis issue is fairly important and should be addressed

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