问题描述
我们有一个基于Netty的网络流量密集型Java应用程序/服务器。
侧面说明：我主要支持此应用，但我没有构建它，所以我不完全了解它。
以前，我们通常在服务器启动3-4天后收到此错误。现在我注意到，即使在重新启动服务器/应用程序后仅10-15分钟，我们仍会收到此错误。
我不知道这怎么可能。这个错误令人担忧吗？我们该如何解决？我记得过去曾经对这个错误进行过广泛的研究，当时我什至尝试升级和修补Netty，但没有任何方法可以完全解决问题。
操作系统：Linux
Java版本：1.8
网络版本：netty-all-4.1.30.Final.jar
这是应用程序特定代码的唯一一行，其他所有事情都在Netty中发生。
com.company.japp.protocol.http.decoders.ConditionalHttpChunkAggregator.channelRead
这是Netty本身的某种错误吗？ Netty升级或任何其他配置调整对您有帮助吗？
[2020-09-04 08:33:53,072]
ERROR
io.netty.util.ResourceLeakDetector
LEAK: ByteBuf.release() was not called before it's garbage-collected.
See https://netty.io/wiki/reference-counted-objects.html for more @R_406_4045@ion.
Recent access records:
Created at:
io.netty.buffer.AbstractByteBufAllocator.compositeDirectBuffer(AbstractByteBufAllocator.java:221)
io.netty.buffer.AbstractByteBufAllocator.compositeBuffer(AbstractByteBufAllocator.java:199)
io.netty.handler.codec.MessageAggregator.decode(MessageAggregator.java:255)
io.netty.handler.codec.MessagetoMessageDecoder.channelRead(MessagetoMessageDecoder.java:88)
com.company.japp.protocol.http.decoders.ConditionalHttpChunkAggregator.channelRead(ConditionalHttpChunkAggregator.java:112)
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.handler.codec.BytetoMessageDecoder.fireChannelRead(BytetoMessageDecoder.java:323)
io.netty.handler.codec.BytetoMessageDecoder.channelRead(BytetoMessageDecoder.java:297)
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.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
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:748)
这是ConditionalHttpChunkAggregator的代码。
package com.company.japp.protocol.http.decoders;
import com.company.japp.IHttpProxyServer;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpMessage;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.util.HashSet;
@ChannelHandler.Sharable
public class ConditionalHttpChunkAggregator extends HttpObjectAggregator {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(ConditionalHttpChunkAggregator.class);
private volatile boolean sendaschunked;
private volatile int maxContentLength;
private static IHttpProxyServer iHttpProxyServer;
public static void initialize(IHttpProxyServer iHttpProxyServer) {
ConditionalHttpChunkAggregator.iHttpProxyServer = iHttpProxyServer;
}
public ConditionalHttpChunkAggregator(int maxContentLength) {
super(maxContentLength);
this.maxContentLength = maxContentLength;
sendaschunked = false;
}
@Override
public void channelRead(ChannelHandlerContext ctx,Object msg){
if ((msg instanceof HttpResponse)) {
HttpResponse response = (HttpResponse)msg;
if ((msg instanceof HttpMessage)) {
HttpMessage httpmessage= (HttpMessage)msg;
try {
// If the content length exceeds the threshhold,then send it as chunked
// It's too large to process substitutions
Long contentlength =
httpmessage.headers().get(HttpHeaders.Names.CONTENT_LENGTH) != null ?
Long.valueOf(httpmessage.headers().get(HttpHeaders.Names.CONTENT_LENGTH)) : -1;
if (contentlength >= maxContentLength) {
sendaschunked = true;
} else {
// Check content types
HashSet<String> chunkabletypes = iHttpProxyServer.getConfig().getProperty("chunkabletypes");
if (!chunkabletypes.isEmpty() && response.headers().contains(HttpHeaders.Names.CONTENT_TYPE)) {
String contentType = response.headers().get(HttpHeaders.Names.CONTENT_TYPE).toLowerCase().trim();
if (contentType.length()>0) {
sendaschunked = chunkabletypes.contains(contentType);
if (!sendaschunked) {
for (String chunkabletype: chunkabletypes) {
// Begins with
if (contentType.indexOf(chunkabletype)==0) {
sendaschunked = true;
break;
}
}
}
}
}
}
if (sendaschunked) {
ctx.fireChannelRead(msg);
return;
}
}
catch(Exception ex) {
logger.error("error determining chunkable viability",ex);
}
}
}
if (sendaschunked) {
ctx.fireChannelRead(msg);
return;
}
try {
super.channelRead(ctx,msg);
} catch (Exception e) {
logger.error("error determining chunkable viability",e);
e.printstacktrace();
}
}
}
这是可块化类型属性的值：
video/x-ms-wvx,video/x-flv,application/x-shockwave-flash,video/quicktime,video/,audio/
编辑：
我认为这是io.netty.handler.codec.MessageAggregator中第255行周围netty 4.1.30中的错误。
似乎此CompositeByteBuf已分配但未释放。
我说的对吗？
我希望有一些权威性的答案来确认或拒绝这个想法。
// A streamed message - initialize the cumulative buffer,and wait for incoming chunks.
CompositeByteBuf content = ctx.alloc().compositeBuffer(maxCumulationBufferComponents); // LINE 255
if (m instanceof ByteBufHolder) {
appendPartialContent(content,((ByteBufHolder) m).content());
}
currentMessage = beginAggregation(m,content);
解决方法
您需要释放您分配的Bytebuf。这不是Netty错误。
ByteBuf位于com.company.japp.protocol.http.decoders.ConditionalHttpChunkAggregator.channelRead(ConditionalHttpChunkAggregator.java:112)