netty内存泄露分析方法
背景
我有一个应用,运行一段时间后,会发现内存OOM。
看堆栈,是:
"nioEventLoopGroup-2-1" #30 prio=10 os_prio=0 tid=0x00007fb2706cf800 nid=0x19e runnable [0x00007fb2a834a000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method) at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269) at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93) at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) - locked <0x000000056a86f3e8> (a io.netty.channel.nio.SelectedSelectionKeySet) - locked <0x000000056a86f358> (a java.util.Collections$UnmodifiableSet) - locked <0x0000000569ff0cb0> (a sun.nio.ch.EPollSelectorImpl) at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) at io.netty.channel.nio.SelectedSelectionKeySetSelector.select(SelectedSelectionKeySetSelector.java:62) at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:817) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:460) at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) 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) Locked ownable synchronizers: - None
其实netty提供了内存泄露分析方法的。
分析方法
启动参数
启动增加参数: -Dio.netty.leakDetectionLevel=advanced