issue_comments: 263652409

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https://github.com/pydata/xarray/issues/463#issuecomment-263652409 https://api.github.com/repos/pydata/xarray/issues/463 263652409 MDEyOklzc3VlQ29tbWVudDI2MzY1MjQwOQ== 1217238 2016-11-29T18:17:17Z 2016-11-29T18:17:17Z MEMBER

@shoyer is it ever feasible to read the first NetCDF file in a sequence and assume that they are all the same except to increment a datetime dimension by increasing days?

Sure. This should probably be a different wrapper function than open_mfdataset, though, one that can make stronger assumptions. For example, one might make a wrapper function for handling NcML.

@kmpaul thanks for sharing! This is useful background.

There is at least one other option worth considering. Instead of using the open file LRU cache, a simpler option could be to add an optional argument to xarray backends (building on opener from https://github.com/pydata/xarray/pull/1128) that switches them to open/close files every time data is accessed.

 
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