added docs

Author: sanderegg

packages/aws-library/src/aws_library/s3/_client.py

@@ -89,7 +89,12 @@ async def create(
         exit_stack = contextlib.AsyncExitStack()
         try:
             config = Config(
-                signature_version="s3v4", request_checksum_calculation="when_required"
+                # This setting tells the S3 client to only calculate checksums when explicitly required
+                # by the operation. This avoids unnecessary checksum calculations for operations that
+                # don't need them, improving performance.
+                # See: https://boto3.amazonaws.com/v1/documentation/api/latest/guide/s3.html#calculating-checksums
+                signature_version="s3v4",
+                request_checksum_calculation="when_required",
             )
             session_client = session.client(  # type: ignore[call-overload]
                 "s3",

services/dask-sidecar/src/simcore_service_dask_sidecar/file_utils.py

@@ -69,10 +69,15 @@ def _s3fs_settings_from_s3_settings(s3_settings: S3Settings) -> S3FsSettingsDict
     s3fs_settings: S3FsSettingsDict = {
         "key": s3_settings.S3_ACCESS_KEY,
         "secret": s3_settings.S3_SECRET_KEY,
-        "client_kwargs": {},
-        "config_kwargs": {
-            "request_checksum_calculation": "when_required",
-            "signature_version": "s3v4",
+        "client_kwargs": {
+            "config_kwargs": {
+                # This setting tells the S3 client to only calculate checksums when explicitly required
+                # by the operation. This avoids unnecessary checksum calculations for operations that
+                # don't need them, improving performance.
+                # See: https://boto3.amazonaws.com/v1/documentation/api/latest/guide/s3.html#calculating-checksums
+                "request_checksum_calculation": "when_required",
+                "signature_version": "s3v4",
+            }
         },
     }
     if s3_settings.S3_REGION != _DEFAULT_AWS_REGION: