[BugFix] fix cache port and zmq close bugs (#4371)

* Update common_engine.py

* Update zmq_client.py

* Update expert_service.py

---------

Co-authored-by: Jiang-Jia-Jun <163579578+Jiang-Jia-Jun@users.noreply.github.com>

fastdeploy/engine/common_engine.py

@@ -63,12 +63,13 @@ class EngineSevice:
             cfg (Config): Config object containing all the configuration parameters.
         """
         self.cfg = cfg
-        if isinstance(self.cfg.cache_config.cache_queue_port, str):
-            self.cfg.cache_config.cache_queue_port = self.cfg.cache_config.cache_queue_port.split(",")
-        if isinstance(self.cfg.cache_config.cache_queue_port, list):
-            self.cfg.cache_config.cache_queue_port = int(
-                self.cfg.cache_config.cache_queue_port[self.cfg.parallel_config.local_data_parallel_id]
-            )
+        if cfg.splitwise_role != "mixed" or cfg.cache_config.enable_prefix_caching:
+            if isinstance(self.cfg.cache_config.cache_queue_port, str):
+                self.cfg.cache_config.cache_queue_port = self.cfg.cache_config.cache_queue_port.split(",")
+            if isinstance(self.cfg.cache_config.cache_queue_port, list):
+                self.cfg.cache_config.cache_queue_port = int(
+                    self.cfg.cache_config.cache_queue_port[self.cfg.parallel_config.local_data_parallel_id]
+                )
 
         self.scheduler = cfg.scheduler_config.scheduler()
         if envs.ENABLE_V1_KVCACHE_SCHEDULER:

fastdeploy/engine/expert_service.py

@@ -116,8 +116,6 @@ class ExpertService:
             self.cache_manager_processes = self.engine.start_cache_service(
                 self.cfg.local_device_ids, ipc_signal_suffix_cache
             )
-            if self.cfg.splitwise_role != "mixed":
-                self.engine.split_mode_get_tasks()
 
         if self.cfg.scheduler_config.name == "splitwise":
             self.cfg.init_cache_info()

fastdeploy/inter_communicator/zmq_client.py

@@ -18,6 +18,8 @@ from abc import ABC, abstractmethod
 
 import zmq
 
+from fastdeploy.utils import llm_logger
+
 
 class ZmqClientBase(ABC):
     """
@@ -89,3 +91,19 @@ class ZmqIpcClient(ZmqClientBase):
     def connect(self):
         self._ensure_socket()
         self.socket.connect(f"ipc://{self.file_name}")
+
+    def close(self):
+        """
+        Close the socket and context.
+        """
+        llm_logger.info("ZMQ client is closing connection...")
+        try:
+            if self.socket is not None and not self.socket.closed:
+                self.socket.setsockopt(zmq.LINGER, 0)
+                self.socket.close()
+            if self.context is not None:
+                self.context.term()
+
+        except Exception as e:
+            llm_logger.warning(f"ZMQ client failed to close connection - {e}")
+            return