修复issue556 EpollEventLoopGroup启动失败的bug

remoting/src/main/java/org/apache/rocketmq/remoting/netty/NettyRemotingServer.java

@@ -108,16 +108,16 @@ public class NettyRemotingServer extends NettyRemotingAbstract implements Remoti
             }
         });
 
-        this.eventLoopGroupBoss = new NioEventLoopGroup(1, new ThreadFactory() {
+        if (useEpoll()) {
+            this.eventLoopGroupBoss = new EpollEventLoopGroup(1, new ThreadFactory() {
                 private AtomicInteger threadIndex = new AtomicInteger(0);
 
                 @Override
                 public Thread newThread(Runnable r) {
-                return new Thread(r, String.format("NettyBoss_%d", this.threadIndex.incrementAndGet()));
+                    return new Thread(r, String.format("NettyEPOLLBoss_%d", this.threadIndex.incrementAndGet()));
                 }
             });
 
-        if (useEpoll()) {
             this.eventLoopGroupSelector = new EpollEventLoopGroup(nettyServerConfig.getServerSelectorThreads(), new ThreadFactory() {
                 private AtomicInteger threadIndex = new AtomicInteger(0);
                 private int threadTotal = nettyServerConfig.getServerSelectorThreads();
@@ -128,6 +128,15 @@ public class NettyRemotingServer extends NettyRemotingAbstract implements Remoti
                 }
             });
         } else {
+            this.eventLoopGroupBoss = new NioEventLoopGroup(1, new ThreadFactory() {
+                private AtomicInteger threadIndex = new AtomicInteger(0);
+
+                @Override
+                public Thread newThread(Runnable r) {
+                    return new Thread(r, String.format("NettyNIOBoss_%d", this.threadIndex.incrementAndGet()));
+                }
+            });
+
             this.eventLoopGroupSelector = new NioEventLoopGroup(nettyServerConfig.getServerSelectorThreads(), new ThreadFactory() {
                 private AtomicInteger threadIndex = new AtomicInteger(0);
                 private int threadTotal = nettyServerConfig.getServerSelectorThreads();