LEAK: ByteBuf.release() Netty引起的堆外内存溢出报错

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已于 2022-09-30 17:10:02 修改

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分类专栏：随笔文章标签： java spring spring boot

于 2022-09-28 14:36:37 首次发布

本文链接：https://blog.youkuaiyun.com/wl1985xy/article/details/127088274

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博客讲述了在使用Spring Boot和Spring Cloud时遇到的ByteBuf.release()未释放导致的堆外内存溢出问题。通过升级Spring Cloud到Hoxton.SR12和Spring Boot到2.3.12.RELEASE来解决这个问题。尝试定位泄露源、修改Netty版本及排查WebFlux依赖均未成功，最终发现是由于Spring Cloud与Spring Boot版本不兼容所致。

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最终解决方式：升级spring cloud版本和spring boot版本
因为我的框架一直使用的是H版，
所以spring cloud升级到了 Hoxton.SR12 ，
对应的spring boot是 : 2.3.12.RELEASE

1、异常信息：

两类报错：

1.1、运行过程中：

LEAK: ByteBuf.release() was not called before it’s garbage-collected. See https://netty.io/wiki/reference-counted-objects.html for more information.

2022-09-13 16:24:45,492 - ERROR #[springAppName_IS_UNDEFINED,,,]# [reactor-http-epoll-2] i.n.u.ResourceLeakDetector [ResourceLeakDetector.java:320]: LEAK: ByteBuf.release() was not called before it's garbage-collected. See https://netty.io/wiki/reference-counted-objects.html for more information.
Recent access records:
Created at:
	io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:363)
	io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:187)
	io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:178)
	io.netty.channel.unix.PreferredDirectByteBufAllocator.ioBuffer(PreferredDirectByteBufAllocator.java:53)
	io.netty.channel.DefaultMaxMessagesRecvByteBufAllocator$MaxMessageHandle.allocate(DefaultMaxMessagesRecvByteBufAllocator.java:114)
	io.netty.channel.epoll.EpollRecvByteAllocatorHandle.allocate(EpollRecvByteAllocatorHandle.java:75)
	io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:777)
	io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:475)
	io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378)
	io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
	io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	java.lang.Thread.run(Thread.java:748)

2022-09-28 09:32:11,439 - ERROR #[springAppName_IS_UNDEFINED,,,]# [reactor-http-epoll-4] i.n.u.ResourceLeakDetector [ResourceLeakDetector.java:320]: LEAK: ByteBuf.release() was not called before it's garbage-collected. See https://netty.io/wiki/reference-counted-objects.html for more information.
Recent access records:
Created at:
	io.netty.buffer.SimpleLeakAwareByteBuf.unwrappedDerived(SimpleLeakAwareByteBuf.java:143)
	io.netty.buffer.SimpleLeakAwareByteBuf.readRetainedSlice(SimpleLeakAwareByteBuf.java:67)
	io.netty.handler.codec.http.HttpObjectDecoder.decode(HttpObjectDecoder.java:376)
	io.netty.handler.codec.http.HttpClientCodec$Decoder.decode(HttpClientCodec.java:225)
	io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:501)
	io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:440)
	io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
	io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251)
	io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
	io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
	io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
	io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
	io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
	io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:792)
	io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:475)
	io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378)
	io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
	io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	java.lang.Thread.run(Thread.java:748)

1.2、最终内存溢出报错：

2022-02-11 09:43:51,268 -  ## [http-nio-8001-exec-4]   user token auth error:Redis exception; nested exception is io.lettuce.core.RedisException: io.netty.handler.codec.EncoderException: io.netty.util.internal.OutOfDirectMemoryError: failed to allocate 16777216 byte(s) of direct memory (used: 1090519047, max: 1090715648) 
org.springframework.data.redis.RedisSystemException: Redis exception;

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