Minor fixes on examples

examples/kafka_consumer.cpp

@@ -27,11 +27,11 @@ int main(int argc, char* argv[]) {
     po::options_description options("Options");
     options.add_options()
         ("help,h",     "produce this help message")
-        ("brokers",  po::value<string>(&brokers)->required(), 
+        ("brokers,b",  po::value<string>(&brokers)->required(), 
                        "the kafka broker list")
-        ("topic",    po::value<string>(&topic_name)->required(),
+        ("topic,t",    po::value<string>(&topic_name)->required(),
                        "the topic in which to write to")
-        ("group-id", po::value<string>(&group_id)->required(),
+        ("group-id,g", po::value<string>(&group_id)->required(),
                        "the consumer group id")
         ;
 
@@ -84,7 +84,8 @@ int main(int argc, char* argv[]) {
         if (msg) {
             // If we managed to get a message
             if (msg.get_error()) {
-                if (msg.get_error() != RD_KAFKA_RESP_ERR__PARTITION_EOF) {
+                // Ignore EOF notifications from rdkafka
+                if (!msg.is_eof()) {
                     cout << "[+] Received error notification: " << msg.get_error() << endl;
                 }
             }

examples/kafka_producer.cpp

@@ -48,7 +48,9 @@ int main(int argc, char* argv[]) {
         return 1;
     }
 
+    // Create a message builder for this topic
     MessageBuilder builder(topic_name);
+
     // Get the partition we want to write to. If no partition is provided, this will be
     // an unassigned one
     if (partition_value != -1) {
@@ -68,8 +70,10 @@ int main(int argc, char* argv[]) {
     // Now read lines and write them into kafka
     string line;
     while (getline(cin, line)) {
+        // Set the payload on this builder
         builder.payload(line);
-        // Write the string into the partition
+
+        // Actually produce the message we've built
         producer.produce(builder);
     }
 }