kafka use temp transport to fetch metadata.

@@ -275,8 +275,6 @@ SrsKafkaProducer::SrsKafkaProducer()
     cache = new SrsKafkaCache();
     
     lb = new SrsLbRoundRobin();
-    transport = new SrsTcpClient();
-    kafka = new SrsKafkaClient(transport);
 }
 
 SrsKafkaProducer::~SrsKafkaProducer()
@@ -284,8 +282,6 @@ SrsKafkaProducer::~SrsKafkaProducer()
     clear_metadata();
     
     srs_freep(lb);
-    srs_freep(kafka);
-    srs_freep(transport);
     
     srs_freep(worker);
     srs_freep(pthread);
@@ -443,6 +439,12 @@ int SrsKafkaProducer::request_metadata()
         return ret;
     }
     
+    SrsTcpClient* transport = new SrsTcpClient();
+    SrsAutoFree(SrsTcpClient, transport);
+    
+    SrsKafkaClient* kafka = new SrsKafkaClient(transport);
+    SrsAutoFree(SrsKafkaClient, kafka);
+    
     std::string server;
     int port = SRS_CONSTS_KAFKA_DEFAULT_PORT;
     if (true) {
@@ -460,7 +462,6 @@ int SrsKafkaProducer::request_metadata()
     }
     
     // reconnect to kafka server.
-    transport->close();
     if ((ret = transport->connect(server, port, SRS_CONSTS_KAFKA_TIMEOUT_US)) != ERROR_SUCCESS) {
         srs_error("kafka connect %s:%d failed. ret=%d", server.c_str(), port, ret);
         return ret;

@@ -164,8 +164,6 @@ public:
 private:
     SrsLbRoundRobin* lb;
     SrsAsyncCallWorker* worker;
-    SrsTcpClient* transport;
-    SrsKafkaClient* kafka;
 public:
     SrsKafkaProducer();
     virtual ~SrsKafkaProducer();