issue_comments: 1546942397

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https://github.com/pydata/xarray/issues/5511#issuecomment-1546942397 https://api.github.com/repos/pydata/xarray/issues/5511 1546942397 IC_kwDOAMm_X85cNHe9 25071375 2023-05-14T16:41:38Z 2023-05-14T17:03:57Z CONTRIBUTOR

Hi @shoyer, sorry for bothering you with this issue again, I know that it is old right now, but I have been dealing with it again some days ago and I have also noticed the same problem using the region parameter, so I was thinking that based on this issue I opened on Zarr (https://github.com/zarr-developers/zarr-python/issues/1414) it would be good to implement any of this options to solve the problem:

  1. A warning on the docs indicating that it is necessary to add a synchronizer if you want to append or update data to a Zarr file, or that you need to manually align the chunks based on the size of the missing data on the last chunk to be able to get independent writes.

  2. Automatically align the chunks to get independent writes (which I think can produce slower writes due to the modification of the chunks).

  3. Raise an error if there is no synchronizer and the chunks are not properly aligned, I think that the error can be controlled using the parameter safe_chunks that you offer on the to_zarr method.

 
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