Few performance tuning parameters

@@ -87,6 +87,7 @@ mqtt:
     leak_detector_level: "${NETTY_LEASK_DETECTOR_LVL:DISABLED}"
     boss_group_thread_count: "${NETTY_BOSS_GROUP_THREADS:1}"
     worker_group_thread_count: "${NETTY_WORKER_GROUP_THREADS:12}"
+    max_payload_size: "${NETTY_MAX_PAYLOAD_SIZE:65536}"
   # MQTT SSL configuration
   ssl:
     # Enable/disable SSL support

@@ -60,6 +60,10 @@ public abstract class AbstractCassandraCluster {
     private long initTimeout;
     @Value("${cassandra.init_retry_interval_ms}")
     private long initRetryInterval;
+    @Value("${cassandra.max_requests_per_connection_local:128}")
+    private int max_requests_local;
+    @Value("${cassandra.max_requests_per_connection_remote:128}")
+    private int max_requests_remote;
 
     @Autowired
     private CassandraSocketOptions socketOpts;
@@ -90,8 +94,8 @@ public abstract class AbstractCassandraCluster {
                 .withClusterName(clusterName)
                 .withSocketOptions(socketOpts.getOpts())
                 .withPoolingOptions(new PoolingOptions()
-                        .setMaxRequestsPerConnection(HostDistance.LOCAL, 32768)
-                        .setMaxRequestsPerConnection(HostDistance.REMOTE, 32768));
+                        .setMaxRequestsPerConnection(HostDistance.LOCAL, max_requests_local)
+                        .setMaxRequestsPerConnection(HostDistance.REMOTE, max_requests_remote));
         this.clusterBuilder.withQueryOptions(queryOpts.getOpts());
         this.clusterBuilder.withCompression(StringUtils.isEmpty(compression) ? Compression.NONE : Compression.valueOf(compression.toUpperCase()));
         if (ssl) {

@@ -33,8 +33,6 @@ import org.thingsboard.server.transport.mqtt.adaptors.MqttTransportAdaptor;
  */
 public class MqttTransportServerInitializer extends ChannelInitializer<SocketChannel> {
 
-    private static final int MAX_PAYLOAD_SIZE = 64 * 1024 * 1024;
-
     private final SessionMsgProcessor processor;
     private final DeviceService deviceService;
     private final DeviceAuthService authService;
@@ -42,10 +40,11 @@ public class MqttTransportServerInitializer extends ChannelInitializer<SocketCha
     private final MqttTransportAdaptor adaptor;
     private final MqttSslHandlerProvider sslHandlerProvider;
     private final QuotaService quotaService;
+    private final int maxPayloadSize;
 
     public MqttTransportServerInitializer(SessionMsgProcessor processor, DeviceService deviceService, DeviceAuthService authService, RelationService relationService,
                                           MqttTransportAdaptor adaptor, MqttSslHandlerProvider sslHandlerProvider,
-                                          QuotaService quotaService) {
+                                          QuotaService quotaService, int maxPayloadSize) {
         this.processor = processor;
         this.deviceService = deviceService;
         this.authService = authService;
@@ -53,6 +52,7 @@ public class MqttTransportServerInitializer extends ChannelInitializer<SocketCha
         this.adaptor = adaptor;
         this.sslHandlerProvider = sslHandlerProvider;
         this.quotaService = quotaService;
+        this.maxPayloadSize = maxPayloadSize;
     }
 
     @Override
@@ -63,7 +63,7 @@ public class MqttTransportServerInitializer extends ChannelInitializer<SocketCha
             sslHandler = sslHandlerProvider.getSslHandler();
             pipeline.addLast(sslHandler);
         }
-        pipeline.addLast("decoder", new MqttDecoder(MAX_PAYLOAD_SIZE));
+        pipeline.addLast("decoder", new MqttDecoder(maxPayloadSize));
         pipeline.addLast("encoder", MqttEncoder.INSTANCE);
 
         MqttTransportHandler handler = new MqttTransportHandler(processor, deviceService, authService, relationService,

@@ -82,7 +82,8 @@ public class MqttTransportService {
     private Integer bossGroupThreadCount;
     @Value("${mqtt.netty.worker_group_thread_count}")
     private Integer workerGroupThreadCount;
-
+    @Value("${mqtt.netty.max_payload_size}")
+    private Integer maxPayloadSize;
 
     private MqttTransportAdaptor adaptor;
 
@@ -106,7 +107,7 @@ public class MqttTransportService {
         b.group(bossGroup, workerGroup)
                 .channel(NioServerSocketChannel.class)
                 .childHandler(new MqttTransportServerInitializer(processor, deviceService, authService, relationService,
-                        adaptor, sslHandlerProvider, quotaService));
+                        adaptor, sslHandlerProvider, quotaService, maxPayloadSize));
 
         serverChannel = b.bind(host, port).sync().channel();
         log.info("Mqtt transport started!");