diff --git a/lib/core/leader.js b/lib/core/leader.js
index a650ab5..c7051f4 100644
--- a/lib/core/leader.js
+++ b/lib/core/leader.js
@@ -23,13 +23,14 @@ module.exports = class Leader extends Base {
       logger: this.logger
     });
     await this.server.ready();
-    this.server.on('follow', async ({client, data}) => {
+
+    this.server.on('follow', async ({request, data}) => {
       this.logger.info(`Leader recieved Follower(${data.from})'s connection.`);
-      await client.send({data: 'ok'});
+      await request.send({data: 'ok'});
       this.server.broadcast();
     });
 
-    this.server.on('message', ({client, body}) => {
+    this.server.on('message', ({request, body}) => {
       this.logger.info(body);
     });
   }
diff --git a/lib/core/server.js b/lib/core/server.js
index 5f89b1f..d2f48a0 100644
--- a/lib/core/server.js
+++ b/lib/core/server.js
@@ -2,7 +2,7 @@ const Base = require('sdk-base');
 const net = require('net');
 const pify = require('pify');
 
-class Client extends Base  {
+class Request extends Base  {
   get socket() {
     return this.options.socket;
   }
@@ -28,6 +28,7 @@ module.exports = class Leader extends Base {
     super(Object.assign({}, options, {
       initMethod: '_init'
     }));
+    this.requestPool = new Map();
   }
 
   get port() {
@@ -40,37 +41,35 @@ module.exports = class Leader extends Base {
 
   async broadcast(data) {
     const promises = [];
-    this.sockets.forEach((client) => {
-      promises.push(client.send(data));
+    this.requestPool.forEach((request) => {
+      promises.push(request.send(data));
     });
 
     await Promise.all(promises);
   }
 
   async _init() {
-    this.sockets = new Map();
-
     this.server = net.createServer((socket) => {
-      if (!this.sockets.has(socket)) {
-        this.sockets.set(socket, new Client({
+      if (!this.requestPool.has(socket)) {
+        this.requestPool.set(socket, new Request({
           socket
         }));
       }
-      const client = this.sockets.get(socket);
+      const request = this.requestPool.get(socket);
       let header;
-      let bodyLen = null;
+      let bodySize = null;
       
       const readPacket = () => {
-        if (bodyLen === null) {
+        if (bodySize === null) {
           header = socket.read(8);
           if (!header) {
             return false;
           }
-          bodyLen = header.readInt32BE(4);
+          bodySize = header.readInt32BE(4);
         }
     
-        if (bodyLen !== 0) {
-          const buf = socket.read(bodyLen);
+        if (bodySize !== 0) {
+          const buf = socket.read(bodySize);
           const str = buf.toString();
           const data = JSON.parse(str);
           const { action } = data;
@@ -78,10 +77,10 @@ module.exports = class Leader extends Base {
           const actionName = isolateActions.includes(action)? action: 'message';
 
           this.emit(actionName, {
-            client, data,
+            request, data,
           });
         }
-        bodyLen = null;
+        bodySize = null;
         return true;
       }
     
@@ -96,6 +95,10 @@ module.exports = class Leader extends Base {
           this.logger.error(err);
         }
       });
+
+      socket.on('close', () => {
+        this.requestPool.delete(socket);
+      });
     });
 
     const success = await new Promise((resolve) => {