netty ByteBuf 泄露实例
所属分类 netty
浏览量 1478
以 discard 例子为例
DiscardServerHandler 继承 SimpleChannelInboundHandler
实现 channelRead0 方法
在 SimpleChannelInboundHandler 的 channelRead 里会做 释放
因此官方的例子没有问题
DIY一个 没有释放 造成泄露的 MyDiscardServerHandler
注意 MyDiscardServerHandler 继承 ChannelInboundHandlerAdapter !!!
public class MyDiscardServerHandler extends ChannelInboundHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
// discard
// 没有release 堆外内存会溢出
// java.lang.OutOfMemoryError: Direct buffer memory
// System.out.println(msg.toString());
System.out.println(DiscardServer.getInfo(msg));
// System.gc();
}
DiscardServer 增加启动参数
-Dio.netty.leakDetectionLevel=advanced
启动 DiscardClient 不断的往 DiscardServer 发数据
DiscardClient 是一个 基于 BIO 用 socket 实现的 客户端
完整代码
https://gitee.com/dyyx/netty4demo/tree/master/src/main/java/dyyx/discard
观察 DiscardServer 日志 ,会发现 LEAK 信息
LEAK: ByteBuf.release() was not called before it's garbage-collected. See http://netty.io/wiki/reference-counted-objects.html for more information.
cat xxx.log |grep LEAK: | wc -l
ERROR nioEventLoopGroup-3-1 io.netty.util.ResourceLeakDetector io.netty.util.ResourceLeakDetector.reportTracedLeak(ResourceLeakDetector.java:311) - 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:
#1:
io.netty.buffer.AdvancedLeakAwareByteBuf.getBytes(AdvancedLeakAwareByteBuf.java:244)
dyyx.util.CommUtil.toString(CommUtil.java:27)
dyyx.discard.DiscardServer.getInfo(DiscardServer.java:64)
dyyx.discard.MyDiscardServerHandler.channelRead(MyDiscardServerHandler.java:17)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644)
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:579)
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:496)
io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458)
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
java.lang.Thread.run(Thread.java:745)
#2:
Hint: 'MyDiscardServerHandler#0' will handle the message from this point.
io.netty.channel.DefaultChannelPipeline.touch(DefaultChannelPipeline.java:116)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1434)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644)
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:579)
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:496)
io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458)
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
java.lang.Thread.run(Thread.java:745)
#3:
Hint: 'DefaultChannelPipeline$HeadContext#0' will handle the message from this point.
io.netty.channel.DefaultChannelPipeline.touch(DefaultChannelPipeline.java:116)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:965)
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163)
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644)
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:579)
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:496)
io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458)
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
java.lang.Thread.run(Thread.java:745)
#4:
io.netty.buffer.AdvancedLeakAwareByteBuf.writeBytes(AdvancedLeakAwareByteBuf.java:634)
io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:347)
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:148)
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644)
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:579)
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:496)
io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458)
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
java.lang.Thread.run(Thread.java:745)
Created at:
io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:331)
io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:185)
io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:176)
io.netty.buffer.AbstractByteBufAllocator.ioBuffer(AbstractByteBufAllocator.java:137)
io.netty.channel.DefaultMaxMessagesRecvByteBufAllocator$MaxMessageHandle.allocate(DefaultMaxMessagesRecvByteBufAllocator.java:114)
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:147)
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644)
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:579)
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:496)
io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458)
io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
java.lang.Thread.run(Thread.java:745)
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