[Java] Enable GCS server when running java unit tests (#7041)

* enable gcs service when run java testcase

* fix ci bug

* fix windows compile bug

* fix ci bug

* restart ci job

* enable java testcase

* restart ci job

* restart ci job

* add debug log

* add debug log

* restart ci job

* add debug log

* restart ci

* add debug log

* fix java testcase bug

* restart ci job

* restart ci job

* restart ci job

* restart ci job

* restart ci job

* restart ci job

* restart ci job

* restart ci job

python/ray/node.py

@@ -513,6 +513,22 @@ class Node:
             process_info
         ]
 
+    def start_gcs_server(self):
+        """Start the gcs server.
+        """
+        stdout_file, stderr_file = self.new_log_files("gcs_server")
+        process_info = ray.services.start_gcs_server(
+            self._redis_address,
+            stdout_file=stdout_file,
+            stderr_file=stderr_file,
+            redis_password=self._ray_params.redis_password,
+            config=self._config)
+        assert (
+            ray_constants.PROCESS_TYPE_GCS_SERVER not in self.all_processes)
+        self.all_processes[ray_constants.PROCESS_TYPE_GCS_SERVER] = [
+            process_info
+        ]
+
     def start_raylet(self, use_valgrind=False, use_profiler=False):
         """Start the raylet.
 
@@ -592,6 +608,10 @@ class Node:
         assert self._redis_address is None
         # If this is the head node, start the relevant head node processes.
         self.start_redis()
+
+        if os.environ.get("RAY_GCS_SERVICE_ENABLED", None):
+            self.start_gcs_server()
+
         self.start_monitor()
         self.start_raylet_monitor()
         if self._ray_params.include_webui:
@@ -770,6 +790,15 @@ class Node:
         self._kill_process_type(
             ray_constants.PROCESS_TYPE_MONITOR, check_alive=check_alive)
 
+    def kill_gcs_server(self, check_alive=True):
+        """Kill the gcs server.
+        Args:
+            check_alive (bool): Raise an exception if the process was already
+                dead.
+        """
+        self._kill_process_type(
+            ray_constants.PROCESS_TYPE_GCS_SERVER, check_alive=check_alive)
+
     def kill_raylet_monitor(self, check_alive=True):
         """Kill the raylet monitor.