issue_comments: 398579480

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https://github.com/pydata/xarray/issues/2237#issuecomment-398579480 https://api.github.com/repos/pydata/xarray/issues/2237 398579480 MDEyOklzc3VlQ29tbWVudDM5ODU3OTQ4MA== 1217238 2018-06-19T23:43:18Z 2018-06-19T23:43:32Z MEMBER

In your example what does the chunking of the indexed array likely to look like? How is the interaction between contiguous regions of the index and the chunk structure of the indexed array?

Assuming the original array is chunked into one file per year-month (which is probably a reasonable starting point): - For the groupby('time.month') example: each contiguous run of indices should be indexing a contiguous chunk. This case should work nicely. - For the groupby('time.dayofyear') example: each index will be pulling data from a different chunk. This is still a bit of a fail case for the scheduler.

 
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