fixed issue #726, 去掉socket receiveBuffer/sendBuffer的设置,影响网络吞吐量

driver/src/main/java/com/alibaba/otter/canal/parse/driver/mysql/packets/client/BinlogDumpCommandPacket.java

@@ -54,7 +54,7 @@ public class BinlogDumpCommandPacket extends CommandPacket {
         // 1. write 4 bytes bin-log position to start at
         ByteHelper.writeUnsignedIntLittleEndian(binlogPosition, out);
         // 2. write 2 bytes bin-log flags
-        int binlog_flags = 0;
+        int binlog_flags = BINLOG_DUMP_NON_BLOCK;
         binlog_flags |= BINLOG_SEND_ANNOTATE_ROWS_EVENT;
         out.write(binlog_flags);
         out.write(0x00);

driver/src/main/java/com/alibaba/otter/canal/parse/driver/mysql/socket/BioSocketChannelPool.java

@@ -11,8 +11,6 @@ public abstract class BioSocketChannelPool {
 
     public static BioSocketChannel open(SocketAddress address) throws Exception {
         Socket socket = new Socket();
-        socket.setReceiveBufferSize(32 * 1024);
-        socket.setSendBufferSize(32 * 1024);
         socket.setSoTimeout(BioSocketChannel.SO_TIMEOUT);
         socket.setTcpNoDelay(true);
         socket.setKeepAlive(true);

driver/src/main/java/com/alibaba/otter/canal/parse/driver/mysql/socket/NettySocketChannelPool.java

@@ -37,11 +37,10 @@ public abstract class NettySocketChannelPool {
     static {
         boot.group(group)
             .channel(NioSocketChannel.class)
-            .option(ChannelOption.SO_RCVBUF, 32 * 1024)
-            .option(ChannelOption.SO_SNDBUF, 32 * 1024)
             .option(ChannelOption.TCP_NODELAY, true)
             // 如果是延时敏感型应用，建议关闭Nagle算法
             .option(ChannelOption.SO_KEEPALIVE, true)
+            .option(ChannelOption.SO_REUSEADDR, true)
             .option(ChannelOption.RCVBUF_ALLOCATOR, AdaptiveRecvByteBufAllocator.DEFAULT)
             .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
             //