Revert "Enable Ray client server by default (#13350)" (#13429)

This reverts commit 912d0cbbf9.

doc/source/ray-client.rst

@@ -10,13 +10,11 @@ Ray Client
 Basic usage
 ===========
 
-The Ray client server is automatically started on port ``10001`` when you use ``ray start --head`` or Ray in an autoscaling cluster. The port can be changed by specifying --ray-client-server-port in the ``ray start`` command.
-
-To start the server manually, you can run:
+While in beta, the server is available as an executable module. To start the server, run
 
 ``python -m ray.util.client.server [--host host_ip] [--port port] [--redis-address address] [--redis-password password]``
 
-This runs ``ray.init()`` with default options and exposes the client gRPC port at ``host_ip:port`` (by default, ``0.0.0.0:10001``). Providing ``redis-address`` and ``redis-password`` will be passed into ``ray.init()`` when the server starts, allowing connection to an existing Ray cluster, as per the `cluster setup <cluster/index.html>`_ instructions.
+This runs ``ray.init()`` with default options and exposes the client gRPC port at ``host_ip:port`` (by default, ``0.0.0.0:50051``). Providing ``redis-address`` and ``redis-password`` will be passed into ``ray.init()`` when the server starts, allowing connection to an existing Ray cluster, as per the `cluster setup <cluster/index.html>`_ instructions.
 
 From here, another Ray script can access that server from a networked machine with ``ray.util.connect()``
 
@@ -25,7 +23,7 @@ From here, another Ray script can access that server from a networked machine wi
    import ray
    import ray.util
 
-   ray.util.connect("<head_node_host>:10001")  # replace with the appropriate host and port
+   ray.util.connect("0.0.0.0:50051")  # replace with the appropriate host and port
 
    # Normal Ray code follows
    @ray.remote
@@ -34,12 +32,13 @@ From here, another Ray script can access that server from a networked machine wi
 
    do_work.remote(2)
    #....
-  
-When the client disconnects, any object or actor references held by the server on behalf of the client are dropped, as if directly disconnecting from the cluster.
 
-============
-Known issues
-============
+When the client disconnects, any object or actor references held by the server on behalf of the client are dropped, as if directly disconnecting from the cluster
+
+
+===================
+``RAY_CLIENT_MODE``
+===================
 
 Because Ray client mode affects the behavior of the Ray API, larger scripts or libraries imported before ``ray.util.connect()`` may not realize they're in client mode. This feature is being tracked with `issue #13272 <https://github.com/ray-project/ray/issues/13272>`_ but the workaround here is provided for beta users.
 
@@ -50,3 +49,21 @@ Therefore, an environment variable is also available to force a Ray program into
 .. code-block:: bash
 
    RAY_CLIENT_MODE=1 python my_ray_program.py
+
+
+===================================
+Programatically creating the server
+===================================
+
+For larger use-cases, it may be desirable to connect remote Ray clients to an existing Ray environment. The server can be started separately via
+
+.. code-block:: python
+
+   from ray.util.client.server import serve
+
+   server = serve("0.0.0.0:50051")
+   # Server does some work
+   # ...
+   # Time to clean up
+   server.stop(0)
+

python/ray/scripts/scripts.py

@@ -282,7 +282,7 @@ def debug(address):
     "--ray-client-server-port",
     required=False,
     type=int,
-    default=10001,
+    default=None,
     help="the port number the ray client server will bind on. If not set, "
     "the ray client server will not be started.")
 @click.option(

python/ray/tests/test_job.py

@@ -33,7 +33,7 @@ _ = Actor.remote()
     assert len(actor_table) == 1
 
     job_table = ray.jobs()
-    assert len(job_table) == 3  # dash, ray client server
+    assert len(job_table) == 2
 
     # Kill the driver process.
     p.kill()
@@ -79,7 +79,7 @@ ray.get(_.value.remote())
     assert len(actor_table) == 1
 
     job_table = ray.jobs()
-    assert len(job_table) == 3  # dash, ray client server
+    assert len(job_table) == 2
 
     # Kill the driver process.
     p.kill()