PrePARE hangs with Pool

[doutriaux1]

from @aradhakrishnanGFDL

I notice my PrePARE python session hanging (I think it is the Pool function) in several cases (surprisingly if the input file is in /home or local mount, it seems ok for the most part). We don't really do any multiprocessing with PrePARE yet, so I thought a default of 4 while pooling may have been the cause since I was operating on a single file? I set the -max-processes to "1" and it doesn't hang, but throws an error and aborts. The inline documentation says "-1" is also applicable for this, which is not true since it throws an error.

I am checking to see what the root cause might be (may be catch an exception during pooling?) and if changing to "1" temporarily will get us to finish our runs for now. 

@glevava I think you implemented the Pool section, do you mind taking a look?
@mauzey1 you can take a look if you want, but I think @glevava can point us in the right direction first.

[aradhakrishnanGFDL]

The best example to reproduce this issue is to use an input file that has wrong source_type.

e.g use source_type: "AGCM" (rather than AOGCM)

related issue: #396

[aradhakrishnanGFDL]

Latest conda nightly build has no hang ups. Looks okay so far..Thanks

[doutriaux1]

Thanks @aradhakrishnanGFDL closing for now.