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https://github.com/pydata/xarray/pull/1899#issuecomment-367077311 https://api.github.com/repos/pydata/xarray/issues/1899 367077311 MDEyOklzc3VlQ29tbWVudDM2NzA3NzMxMQ== 291576 2018-02-20T18:43:56Z 2018-02-20T18:43:56Z CONTRIBUTOR

I did some more investigation into the memory usage problem I was having. I had assumed that the vectorized indexed result of a lazily indexed data array would be an in-memory array. So, when I then started to use the result, it was then doing a read of all the data at once, resulting in a near-complete load of the data into memory.

I have adjusted my code to chunk out the indexing in order to keep the memory usage under control at reasonable performance penalty. I haven't looked into trying to identify the ideal chunking scheme to follow for an arbitrary dataarray and indexing. Perhaps we can make that a task for another day. At this point, I am satisfied with the features (negative step-sizes aside, of course).

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