Netty的内存泄漏问题

在测试netty时发现这个问题

LEAK: ByteBuf.release() was not called before it's garbage-collected. Enable advanced leak reporting to find out where the leak occurred. To enable advanced leak reporting, specify the JVM option '-Dio.netty.leakDetectionLevel=advanced' or call ResourceLeakDetector.setLevel() See http://netty.io/wiki/reference-counted-objects.html for more information. |

两种方式改变日志级别

ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.ADVANCED);
-Dio.netty.leakDetectionLevel=advanced

继续测试：

 LEAK: ByteBuf.release() was not called before it's garbage-collected. See http://netty.io/wiki/reference-counted-objects.html for more information.
Recent access records: 5
#5:
    io.netty.buffer.AdvancedLeakAwareByteBuf.toString(AdvancedLeakAwareByteBuf.java:697)
    io.netty.handler.codec.http.websocketx.TextWebSocketFrame.text(TextWebSocketFrame.java:94)
    com.qingqing.livebroker.server.handler.WebsocketMsgHandler.channelRead(WebsocketMsgHandler.java:76)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler$1.channelRead(WebSocketServerProtocolHandler.java:146)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:244)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
    io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
    io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
    io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
    java.lang.Thread.run(Thread.java:745)
#4:
    io.netty.buffer.AdvancedLeakAwareByteBuf.release(AdvancedLeakAwareByteBuf.java:45)
    io.netty.buffer.DefaultByteBufHolder.release(DefaultByteBufHolder.java:73)
    io.netty.util.ReferenceCountUtil.release(ReferenceCountUtil.java:59)
    io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:91)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler$1.channelRead(WebSocketServerProtocolHandler.java:146)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:244)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
    io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
    io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
    io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
    java.lang.Thread.run(Thread.java:745)
#3:
    io.netty.buffer.AdvancedLeakAwareByteBuf.retain(AdvancedLeakAwareByteBuf.java:709)
    io.netty.buffer.DefaultByteBufHolder.retain(DefaultByteBufHolder.java:61)
    io.netty.handler.codec.http.websocketx.WebSocketFrame.retain(WebSocketFrame.java:76)
    io.netty.handler.codec.http.websocketx.TextWebSocketFrame.retain(TextWebSocketFrame.java:109)
    io.netty.handler.codec.http.websocketx.TextWebSocketFrame.retain(TextWebSocketFrame.java:25)
    io.netty.handler.codec.http.websocketx.WebSocketProtocolHandler.decode(WebSocketProtocolHandler.java:37)
    io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler.decode(WebSocketServerProtocolHandler.java:114)
    io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler.decode(WebSocketServerProtocolHandler.java:51)
    io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler$1.channelRead(WebSocketServerProtocolHandler.java:146)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:244)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
    io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
    io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
    io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
    java.lang.Thread.run(Thread.java:745)
#2:
    io.netty.buffer.AdvancedLeakAwareByteBuf.forEachByte(AdvancedLeakAwareByteBuf.java:625)
    io.netty.handler.codec.http.websocketx.Utf8Validator.check(Utf8Validator.java:74)
    io.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder.checkUTF8String(WebSocket08FrameDecoder.java:464)
    io.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder.decode(WebSocket08FrameDecoder.java:337)
    io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:370)
    io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:230)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
    io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
    io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
    io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
    java.lang.Thread.run(Thread.java:745)
#1:
    io.netty.buffer.AdvancedLeakAwareByteBuf.setByte(AdvancedLeakAwareByteBuf.java:253)
    io.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder.unmask(WebSocket08FrameDecoder.java:429)
    io.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder.decode(WebSocket08FrameDecoder.java:302)
    io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:370)
    io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:230)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
    io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
    io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
    io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
    java.lang.Thread.run(Thread.java:745)
Created at:
    io.netty.buffer.UnpooledByteBufAllocator.newDirectBuffer(UnpooledByteBufAllocator.java:55)
    io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:155)
    io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:146)
    io.netty.buffer.AbstractByteBufAllocator.buffer(AbstractByteBufAllocator.java:83)
    io.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder.decode(WebSocket08FrameDecoder.java:263)
    io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:370)
    io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:230)
    io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:308)
    io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:294)
    io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)
    io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
    io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
    io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
    java.lang.Thread.run(Thread.java:745) |

ByteBuf 是Netty中主要用来数据byte[]的封装类，主要分为Heap ByteBuf 和 Direct ByteBuf。
为了减少内存的分配回收以及产生的内存碎片，Netty提供了PooledByteBufAllocator 用来分配可回收的ByteBuf，可以把PooledByteBufAllocator看做一个池子，需要的时候从里面获取ByteBuf，用完了放回去，以此提高性能。当然与之对应的还有 UnpooledByteBufAllocator，顾名思义Unpooled就是不会放到池子里，所以根据该分配器分配的ByteBuf，不需要放回池子有JVM自己GC回收。
在netty中，根据ChannelHandlerContext 和 Channel获取的Allocator默认都是Pooled，所以需要再合适的时机对其进行释放，避免造成内存泄漏。
————————————————
原文链接：https://blog.csdn.net/u012807459/article/details/77259869

错误的第三行可以定位到是我的 ChannelInboundHandlerAdapter 没有对获取到 byte进行释放

// 第一种
textWebSocketFrame.release();
// 第二种
//ctx.fireChannelRead(msg);

以上两种方式都可以释放ByteBuf。

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Netty的内存泄漏问题

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