我使用的是低于堆栈的
Spring Cloud Gateway Hoxton Release，Java 1.8，Linux操作系统
我看到以下异常，它在重新启动后消失，但一段时间后再次出现。我没有为直接记忆做任何明确的设置。以下是使用的JVM参数-
-Xms512m -Xmx512m -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSParallelRemarkEnabled -XX:CMSInitiatingOccupancyFraction=60 -XX:+UseCMSInitiatingOccupancyOnly -XX:+DisableExplicitGC -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=10240K -Xloggc:logs/gc.log0423_0751 -verbose:gc -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=logs -XX:+PrintStringTableStatistics -Djava.security.egd=file:///dev/./urandom -Dreactor.netty.http.server.accessLogEnabled=false
有人能告诉我们错误的原因是什么吗？
[2020-04-22 05:49:11,705] [4faa34069d05eede] [668067318] [reactor-http-epoll-3] [ERROR] [o.s.b.a.w.r.e.AbstractErrorWebExceptionHandler] - [b9f747ab] 500 Server Error
for HTTP GET "/lmp/user"
io.netty.handler.codec.EncoderException: io.netty.util.internal.OutOfDirectMemoryError: failed to allocate 16777216 byte(s) of direct memory (used: 503316487, max: 5189
79584)
at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:107)
Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Error has been observed at the following site(s):
|_ checkpoint ⇢ org.springframework.web.cors.reactive.CorsWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.security.web.server.authorization.AuthorizationWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.security.web.server.authorization.ExceptionTranslationWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.security.web.server.authentication.logout.LogoutWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.security.web.server.savedrequest.ServerRequestCacheWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.security.web.server.context.SecurityContextServerWebExchangeWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.security.web.server.context.ReactorContextWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.security.web.server.header.HttpHeaderWriterWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.security.config.web.server.ServerHttpSecurity$ServerWebExchangeReactorContextWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.security.web.server.WebFilterChainProxy [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.cloud.sleuth.instrument.web.TraceWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ HTTP GET "/lmp/user" [ExceptionHandlingWebHandler]
Stack trace:
at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:107)
at io.netty.channel.CombinedChannelDuplexHandler.write(CombinedChannelDuplexHandler.java:348)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
at io.netty.channel.AbstractChannelHandlerContext.access$1700(AbstractChannelHandlerContext.java:56)
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:1102)
at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1149)
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:1073)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:510)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:413)
at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1050)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)
Caused by: io.netty.util.internal.OutOfDirectMemoryError: failed to allocate 16777216 byte(s) of direct memory (used: 503316487, max: 518979584)
at io.netty.util.internal.PlatformDependent.incrementMemoryCounter(PlatformDependent.java:726)
at io.netty.util.internal.PlatformDependent.allocateDirectNoCleaner(PlatformDependent.java:681)
at io.netty.buffer.PoolArena$DirectArena.allocateDirect(PoolArena.java:758)
at io.netty.buffer.PoolArena$DirectArena.newChunk(PoolArena.java:734)
at io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:245)
at io.netty.buffer.PoolArena.allocate(PoolArena.java:215)
at io.netty.buffer.PoolArena.allocate(PoolArena.java:147)
at io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:342)
at io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:187)
at io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:178)
at io.netty.buffer.AbstractByteBufAllocator.buffer(AbstractByteBufAllocator.java:115)
at io.netty.handler.codec.http.HttpObjectEncoder.encode(HttpObjectEncoder.java:93)
at io.netty.handler.codec.http.HttpClientCodec$Encoder.encode(HttpClientCodec.java:167)
at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:89)
at io.netty.channel.CombinedChannelDuplexHandler.write(CombinedChannelDuplexHandler.java:348)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:716)
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:708)
at io.netty.channel.AbstractChannelHandlerContext.access$1700(AbstractChannelHandlerContext.java:56)
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:1102)
at io.netty.channel.AbstractChannelHandlerContext$WriteAndFlushTask.write(AbstractChannelHandlerContext.java:1149)
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:1073)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:510)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:413)
at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1050)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)
似乎问题出在一个过滤器上，该过滤器使用下面的代码将响应体记录在日志文件中
return new ServerHttpResponseDecorator(origResponse) {
@Override
public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
if (body instanceof Flux) {
Flux<? extends DataBuffer> fluxBody = (Flux<? extends DataBuffer>) body;
return super.writeWith(fluxBody.map(dataBuffer -> {
byte[] content = new byte[dataBuffer.readableByteCount()];
dataBuffer.read(content);
String bodyContent = new String(content, StandardCharsets.UTF_8);
GatewayJsonLogger.log(null, exchange.getRequest().getURI().getPath(), bodyContent, "RESPONSE");
return bufferFactory.wrap(content);
}));
}
return super.writeWith(body);
}
};
未释放DataBuffer。以下是修复问题的修订代码
return new ServerHttpResponseDecorator(origResponse) {
@Override
public Mono<Void> writeWith(Publisher<? extends DataBuffer> body) {
if (body instanceof Flux) {
Flux<? extends DataBuffer> fluxBody = (Flux<? extends DataBuffer>) body;
return super.writeWith(fluxBody.map(dataBuffer -> {
try{
byte[] content = new byte[dataBuffer.readableByteCount()];
dataBuffer.read(content);
String bodyContent = new String(content, StandardCharsets.UTF_8);
GatewayJsonLogger.log(null, exchange.getRequest().getURI().getPath(), bodyContent, "RESPONSE");
return bufferFactory.wrap(content);
} finally {
DataBufferUtils.release(dataBuffer);
}
}));
}
return super.writeWith(body);
}
};