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  • Parallel tasks on subsets of a dask array wrapped in an xarray Dataset · 2 ✖

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  • NONE · 2 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
662563406 https://github.com/pydata/xarray/issues/4241#issuecomment-662563406 https://api.github.com/repos/pydata/xarray/issues/4241 MDEyOklzc3VlQ29tbWVudDY2MjU2MzQwNg== maximemorariu 41797673 2020-07-22T16:45:42Z 2020-07-22T16:45:42Z NONE

This is a fundamental problem that is rather hard to solve without creating a copy of the data.

We just released the rechunker package, which makes it easy to create a copy of your data with a different chunking scheme (e.g contiguous in time, chunked in space). If you have enough disk space to store a copy, this might be a good solution.

Thanks for confirming and pointing me to rechunker, that looks nice.

 
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   Parallel tasks on subsets of a dask array wrapped in an xarray Dataset 662982199
662509778 https://github.com/pydata/xarray/issues/4241#issuecomment-662509778 https://api.github.com/repos/pydata/xarray/issues/4241 MDEyOklzc3VlQ29tbWVudDY2MjUwOTc3OA== maximemorariu 41797673 2020-07-22T15:09:24Z 2020-07-22T15:09:24Z NONE

Thanks for your answer. Yes I looked at apply_ufunc and map_blocks and cannot use these here. The reason is that my function here must be applied along the time dimension (e.g., a rolling median in time), but my data is chunked across the time dimension. I could of course re-chunk the data (create a copy where there are no chunks along the time dimension), but I would like to know if this can be avoided.

 
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   Parallel tasks on subsets of a dask array wrapped in an xarray Dataset 662982199

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