issue_comments: 233998757

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https://github.com/pydata/xarray/issues/912#issuecomment-233998757 https://api.github.com/repos/pydata/xarray/issues/912 233998757 MDEyOklzc3VlQ29tbWVudDIzMzk5ODc1Nw== 1217238 2016-07-20T16:11:27Z 2016-07-20T16:11:27Z MEMBER

When you write ds.conc_profs.chunk(2400), it sets up the data to be loaded in a giant chunk, almost the entire file at once. Even if you use .isel() afterwards, dask does not always manage to subset the data from the initial chunk. (Sometimes it does succeed, which makes this a little confusing.)

You will probably be more successful if you try something like ds.conc_profs.chunk({'burst': 10}) instead, which keeps the intermediate chunks to a reasonable size.

 
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