nit

sky/backends/backend_utils.py

@@ -2924,8 +2924,9 @@ def _run_csync_terminate(runner):
             logger.debug(
                 f'CSYNC: failed to terminate the CSYNC on {runner.ip}. '
                 f'Details: {stderr}')
-
-    logger.info(f'CSYNC termination initiated for {cluster_name}. If a '
+    #TODO(Doyoung): Set the following to 'info' when #2504 is resolved
+    # Currently, the logger interrupts the rich progress bar.
+    logger.debug(f'CSYNC termination initiated for {cluster_name}. If a '
                 'sync process is currently running, CSYNC will terminate '
                 'after it completes.\n')
     subprocess_utils.run_in_parallel(_run_csync_terminate, runners)

sky/data/sky_csync.py

@@ -129,9 +129,10 @@ def main():
 def get_s3_upload_cmd(src_path: str, dst: str, num_threads: int, delete: bool,
                       no_follow_symlinks: bool):
     """Builds sync command for aws s3"""
-    sync_cmd = ('aws configure set default.s3.max_concurrent_requests '
-                f'{num_threads};')
-    sync_cmd += f' aws s3 sync {src_path} s3://{dst}'
+    config_cmd = ('aws configure set default.s3.max_concurrent_requests '
+                  f'{num_threads}')
+    subprocess.check_output(config_cmd, shell=True)
+    sync_cmd = f'aws s3 sync {src_path} s3://{dst}'
     if delete:
         sync_cmd += ' --delete'
     if no_follow_symlinks: