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rafalh changed the title Fix checksum related INFO messages spamming the log when downloading … Fix checksum related INFO messages spamming the log when downloading using transfer_manager

rafalh changed the title Fix checksum related INFO messages spamming the log when downloading using transfer_manager fix: do not spam the log with checksum related INFO messages when downloading using transfer_manager

rafalh marked this pull request as ready for review

…nloading using transfer_manager

`download_chunks_concurrently` function does not allow to set `checksum` field in `download_kwargs`. It also does not set it on its own so it takes the default value of `"md5"` (see `Blob._prep_and_do_download`). Because ranged downloads do not return checksums it results in a lot of INFO messages (tens/hundreds):
```
INFO google.resumable_media._helpers - No MD5 checksum was returned from the service while downloading ...
(which happens for composite objects), so client-side content integrity checking is not being performed.
```
To fix it set the `checksum` field to `None` which means no checksum checking for individual chunks. Note that `transfer_manager` has its own checksum checking logic (enabled by `crc32c_checksum` argument)