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https://github.com/pydata/xarray/issues/2190#issuecomment-392647556 https://api.github.com/repos/pydata/xarray/issues/2190 392647556 MDEyOklzc3VlQ29tbWVudDM5MjY0NzU1Ng== 1217238 2018-05-29T04:11:55Z 2018-05-29T04:11:55Z MEMBER

Unfortunately HDF5 doesn't support reading or writing files (even different files) in parallel via the same process, which is why xarray by default adds a lock around all read/write operations from NetCDF4/HDF5 files. So I'm afraid this is expected behavior.

You might have better luck using dask-distributed multiple processes, but then you'll encounter other bottlenecks with data transfer.

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