[Object Spilling] Remove job id from the io worker log name. (#13746)

python/ray/ray_logging.py

@@ -165,15 +165,17 @@ def get_worker_log_file_name(worker_type):
             "please report it to Ray's Github issue.")
         worker_name = "worker"
     else:
-        job_id = ray.JobID.nil()
+        job_id = ""
         worker_name = "io_worker"
 
     # Make sure these values are set already.
     assert ray.worker._global_node is not None
     assert ray.worker.global_worker is not None
     filename = (f"{worker_name}-"
-                f"{binary_to_hex(ray.worker.global_worker.worker_id)}-"
-                f"{job_id}-{os.getpid()}")
+                f"{binary_to_hex(ray.worker.global_worker.worker_id)}-")
+    if job_id:
+        filename += f"{job_id}-"
+    filename += f"{os.getpid()}"
     return filename