Thought someone might be interested in knowing this. When using the
new File API to write blob, the normal 1MB per blobstore data op limit
applies. In other word, if you ever need to write blobs larger than
1MB, make sure you do it in batches. Here's a simple example on how to
do that


        with files.open(blob, 'a') as f:
            write_len = 1024*1024
            for i in range(0, len(content), write_len):
                f.write(content[i:i+write_len])


where 'content' is the large binary stream to be written

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