diff --git a/trunk/src/app/srs_app_config.cpp b/trunk/src/app/srs_app_config.cpp
index 12e6525ee..477a3eca6 100644
--- a/trunk/src/app/srs_app_config.cpp
+++ b/trunk/src/app/srs_app_config.cpp
@@ -2128,6 +2128,8 @@ int SrsConfig::global_to_json(SrsJsonObject* obj)
                     sobj->set(sdir->name, sdir->dumps_arg0_to_boolean());
                 } else if (sdir->name == "brokers") {
                     sobj->set(sdir->name, sdir->dumps_args());
+                } else if (sdir->name == "topic") {
+                    sobj->set(sdir->name, sdir->dumps_arg0_to_str());
                 }
             }
             obj->set(dir->name, sobj);
@@ -3546,7 +3548,7 @@ int SrsConfig::check_config()
         SrsConfDirective* conf = root->get("kafka");
         for (int i = 0; conf && i < (int)conf->directives.size(); i++) {
             string n = conf->at(i)->name;
-            if (n != "enabled" && n != "brokers") {
+            if (n != "enabled" && n != "brokers" && n != "topic") {
                 ret = ERROR_SYSTEM_CONFIG_INVALID;
                 srs_error("unsupported kafka directive %s, ret=%d", n.c_str(), ret);
                 return ret;
diff --git a/trunk/src/app/srs_app_kafka.cpp b/trunk/src/app/srs_app_kafka.cpp
index 9dd1f3def..3c7b01c99 100644
--- a/trunk/src/app/srs_app_kafka.cpp
+++ b/trunk/src/app/srs_app_kafka.cpp
@@ -32,6 +32,7 @@ using namespace std;
 #include <srs_app_async_call.hpp>
 #include <srs_app_utility.hpp>
 #include <srs_kernel_utility.hpp>
+#include <srs_protocol_utility.hpp>
 #include <srs_kernel_balance.hpp>
 #include <srs_kafka_stack.hpp>
 #include <srs_core_autofree.hpp>
@@ -201,6 +202,48 @@ int SrsKafkaProducer::request_metadata()
     }
     SrsAutoFree(SrsKafkaTopicMetadataResponse, metadata);
     
+    // show kafka metadata.
+    string summary;
+    if (true) {
+        vector<string> bs;
+        for (int i = 0; i < metadata->brokers.size(); i++) {
+            SrsKafkaBroker* broker = metadata->brokers.at(i);
+            
+            string hostport = srs_int2str(broker->node_id) + "/" + broker->host.to_str();
+            if (broker->port > 0) {
+                hostport += ":" + srs_int2str(broker->port);
+            }
+            
+            bs.push_back(hostport);
+        }
+        
+        vector<string> ps;
+        for (int i = 0; i < metadata->metadatas.size(); i++) {
+            SrsKafkaTopicMetadata* topic = metadata->metadatas.at(i);
+            
+            string desc = "topic=" + topic->name.to_str();
+            
+            for (int j = 0; j < topic->metadatas.size(); j++) {
+                SrsKafkaPartitionMetadata* partition = topic->metadatas.at(j);
+                
+                desc += ", partition" + srs_int2str(partition->partition_id) +"=";
+                desc += srs_int2str(partition->leader) + "/";
+                
+                vector<string> replicas = srs_kafka_array2vector(&partition->replicas);
+                desc += srs_join_vector_string(replicas, ",");
+            }
+            
+            ps.push_back(desc);
+        }
+        
+        std::stringstream ss;
+        ss << "brokers=" << srs_join_vector_string(bs, ",");
+        ss << ", " << srs_join_vector_string(ps, ",");
+    
+        summary = ss.str();
+    }
+    srs_trace("kafka metadata: %s", summary.c_str());
+    
     meatadata_ok = true;
     
     return ret;
diff --git a/trunk/src/app/srs_app_utility.cpp b/trunk/src/app/srs_app_utility.cpp
index 490cff7ee..f978909dc 100644
--- a/trunk/src/app/srs_app_utility.cpp
+++ b/trunk/src/app/srs_app_utility.cpp
@@ -1467,17 +1467,3 @@ void srs_api_dump_summaries(SrsJsonObject* obj)
     sys->set("conn_srs", SrsJsonAny::integer(nrs->nb_conn_srs));
 }
 
-string srs_join_vector_string(vector<string>& vs, string separator)
-{
-    string str = "";
-
-    for (int i = 0; i < (int)vs.size(); i++) {
-        str += vs.at(i);
-        if (i != (int)vs.size() - 1) {
-            str += separator;
-        }
-    }
-
-    return str;
-}
-
diff --git a/trunk/src/app/srs_app_utility.hpp b/trunk/src/app/srs_app_utility.hpp
index 2ef07d330..971bdbe99 100644
--- a/trunk/src/app/srs_app_utility.hpp
+++ b/trunk/src/app/srs_app_utility.hpp
@@ -677,8 +677,5 @@ extern bool srs_is_boolean(const std::string& str);
 // dump summaries for /api/v1/summaries.
 extern void srs_api_dump_summaries(SrsJsonObject* obj);
 
-// join string in vector with indicated separator
-extern std::string srs_join_vector_string(std::vector<std::string>& vs, std::string separator);
-
 #endif
 
diff --git a/trunk/src/protocol/srs_kafka_stack.cpp b/trunk/src/protocol/srs_kafka_stack.cpp
index 9b966a2dc..ed66d76f5 100644
--- a/trunk/src/protocol/srs_kafka_stack.cpp
+++ b/trunk/src/protocol/srs_kafka_stack.cpp
@@ -23,7 +23,7 @@
 
 #include <srs_kafka_stack.hpp>
 
-#include <string>
+#include <sstream>
 using namespace std;
 
 #include <srs_kernel_error.hpp>
@@ -31,6 +31,8 @@ using namespace std;
 #include <srs_kernel_log.hpp>
 #include <srs_protocol_io.hpp>
 #include <srs_protocol_stream.hpp>
+#include <srs_kernel_utility.hpp>
+#include <srs_protocol_utility.hpp>
 
 #ifdef SRS_AUTO_KAFKA
 
@@ -64,6 +66,15 @@ bool SrsKafkaString::empty()
     return _size <= 0;
 }
 
+string SrsKafkaString::to_str()
+{
+    string ret;
+    if (_size > 0) {
+        ret.append(data, _size);
+    }
+    return ret;
+}
+
 int SrsKafkaString::nb_bytes()
 {
     return _size == -1? 2 : 2 + _size;
@@ -1077,8 +1088,24 @@ int SrsKafkaClient::fetch_metadata(string topic, SrsKafkaTopicMetadataResponse**
 vector<string> srs_kafka_array2vector(SrsKafkaArray<SrsKafkaString>* arr)
 {
     vector<string> strs;
-    for (int i = 0; i < arr->nb_bytes(); i++) {
+    
+    for (int i = 0; i < arr->size(); i++) {
+        SrsKafkaString* elem = arr->at(i);
+        strs.push_back(elem->to_str());
     }
+    
+    return strs;
+}
+
+vector<string> srs_kafka_array2vector(SrsKafkaArray<int32_t>* arr)
+{
+    vector<string> strs;
+    
+    for (int i = 0; i < arr->size(); i++) {
+        int32_t elem = arr->at(i);
+        strs.push_back(srs_int2str(elem));
+    }
+    
     return strs;
 }
 
diff --git a/trunk/src/protocol/srs_kafka_stack.hpp b/trunk/src/protocol/srs_kafka_stack.hpp
index 4e25f2f9e..f181d04dc 100644
--- a/trunk/src/protocol/srs_kafka_stack.hpp
+++ b/trunk/src/protocol/srs_kafka_stack.hpp
@@ -77,6 +77,7 @@ public:
 public:
     virtual bool null();
     virtual bool empty();
+    virtual std::string to_str();
 // interface ISrsCodec
 public:
     virtual int nb_bytes();
@@ -147,6 +148,14 @@ public:
         length++;
         elems.push_back(elem);
     }
+    virtual int size()
+    {
+        return length;
+    }
+    virtual T* at(int index)
+    {
+        return elems.at(index);
+    }
 // interface ISrsCodec
 public:
     virtual int nb_bytes()
@@ -228,6 +237,14 @@ public:
         length++;
         elems.push_back(elem);
     }
+    virtual int size()
+    {
+        return length;
+    }
+    virtual int32_t at(int index)
+    {
+        return elems.at(index);
+    }
     // interface ISrsCodec
 public:
     virtual int nb_bytes()
@@ -792,6 +809,7 @@ public:
 
 // convert kafka array[string] to vector[string]
 extern std::vector<std::string> srs_kafka_array2vector(SrsKafkaArray<SrsKafkaString>* arr);
+extern std::vector<std::string> srs_kafka_array2vector(SrsKafkaArray<int32_t>* arr);
 
 #endif
 
diff --git a/trunk/src/protocol/srs_protocol_utility.cpp b/trunk/src/protocol/srs_protocol_utility.cpp
index 09cfd6b5c..be36509b2 100644
--- a/trunk/src/protocol/srs_protocol_utility.cpp
+++ b/trunk/src/protocol/srs_protocol_utility.cpp
@@ -312,3 +312,17 @@ int srs_write_large_iovs(ISrsProtocolReaderWriter* skt, iovec* iovs, int size, s
     return ret;
 }
 
+string srs_join_vector_string(vector<string>& vs, string separator)
+{
+    string str = "";
+    
+    for (int i = 0; i < (int)vs.size(); i++) {
+        str += vs.at(i);
+        if (i != (int)vs.size() - 1) {
+            str += separator;
+        }
+    }
+    
+    return str;
+}
+
diff --git a/trunk/src/protocol/srs_protocol_utility.hpp b/trunk/src/protocol/srs_protocol_utility.hpp
index d2ce19068..41893a34c 100644
--- a/trunk/src/protocol/srs_protocol_utility.hpp
+++ b/trunk/src/protocol/srs_protocol_utility.hpp
@@ -35,6 +35,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #endif
 
 #include <string>
+#include <vector>
 
 #include <srs_kernel_consts.hpp>
 
@@ -130,5 +131,8 @@ extern int srs_write_large_iovs(
     ssize_t* pnwrite = NULL
 );
 
+// join string in vector with indicated separator
+extern std::string srs_join_vector_string(std::vector<std::string>& vs, std::string separator);
+
 #endif