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  • shoyer · 3 ✖

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  • selecting a point from an mfdataset · 3 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
298755027 https://github.com/pydata/xarray/issues/1396#issuecomment-298755027 https://api.github.com/repos/pydata/xarray/issues/1396 MDEyOklzc3VlQ29tbWVudDI5ODc1NTAyNw== shoyer 1217238 2017-05-02T20:42:37Z 2017-05-02T20:42:37Z MEMBER

One thing worth trying is specifying chunks manually in open_mfdataset. Point-wise indexing should not really require chunks specified ahead of time, but the optimizations dask uses to make these operations efficient are somewhat fragile, so dask may be loading full arrays to do this computation.

 
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   selecting a point from an mfdataset 225774140
298754480 https://github.com/pydata/xarray/issues/1396#issuecomment-298754480 https://api.github.com/repos/pydata/xarray/issues/1396 MDEyOklzc3VlQ29tbWVudDI5ODc1NDQ4MA== shoyer 1217238 2017-05-02T20:40:35Z 2017-05-02T20:40:35Z MEMBER

OK, so that isn't terribly useful -- the slow-down is somewhere in dask-land. If it was an issue with alignment, that would come up when building the dask graph, not computing it.

 
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   selecting a point from an mfdataset 225774140
298738745 https://github.com/pydata/xarray/issues/1396#issuecomment-298738745 https://api.github.com/repos/pydata/xarray/issues/1396 MDEyOklzc3VlQ29tbWVudDI5ODczODc0NQ== shoyer 1217238 2017-05-02T19:38:36Z 2017-05-02T19:38:36Z MEMBER

Can you try using Ctrl + C to interrupt things and report the stack-trace?

This might be an issue with xarray verifying aligned coordinates, which we should have an option to disable. (This came up somewhere else recently, but I couldn't find the issue with a quick search.)

 
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   selecting a point from an mfdataset 225774140

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