[Java] Simplify Ray.init() by invoking ray start internally (#10762)

python/ray/_private/services.py

@@ -279,7 +279,8 @@ def get_address_info_from_redis_helper(redis_address,
 def get_address_info_from_redis(redis_address,
                                 node_ip_address,
                                 num_retries=5,
-                                redis_password=None):
+                                redis_password=None,
+                                no_warning=False):
     counter = 0
     while True:
         try:
@@ -290,10 +291,11 @@ def get_address_info_from_redis(redis_address,
                 raise
             # Some of the information may not be in Redis yet, so wait a little
             # bit.
-            logger.warning(
-                "Some processes that the driver needs to connect to have "
-                "not registered with Redis, so retrying. Have you run "
-                "'ray start' on this node?")
+            if not no_warning:
+                logger.warning(
+                    "Some processes that the driver needs to connect to have "
+                    "not registered with Redis, so retrying. Have you run "
+                    "'ray start' on this node?")
             time.sleep(1)
         counter += 1
 

python/ray/scripts/scripts.py

@@ -537,6 +537,8 @@ def start(node_ip_address, address, port, redis_password, redis_shard_ports,
         with cli_logger.group("Next steps"):
             cli_logger.print(
                 "To connect to this Ray runtime from another node, run")
+            # NOTE(kfstorm): Java driver rely on this line to get the address
+            # of the cluster. Please be careful when updating this line.
             cli_logger.print(
                 cf.bold("  ray start --address='{}'{}"), redis_address,
                 f" --redis-password='{redis_password}'"