关于“太多HashedWheelTimer实例”的Akka警告

Question

当我的基于Akka 1.2的应用程序尝试使用超过500个左右的网格节点时，我收到以下警告：

Jan 05, 2012 1:36:43 PM org.jboss.netty.util.internal.SharedResourceMisuseDetector
WARNING: You are creating too many HashedWheelTimer instances.  
HashedWheelTimer is a shared resource that must be reused across the application, so that only a few instances are created.

我将更深入地研究Akka代码，以找出HashedWheelTimer的使用位置以及我应该做些什么来避免创建太多的。 虽然我正在这样做，但我想我会在这里发布警告以防专家中的一位专家可能能给我一两个可能缩小并加速搜索的指针，好吗？

使用Akka 1.3-RC6，我得到以下异常：

Jan 12, 2012 1:24:38 PM org.jboss.netty.util.HashedWheelTimer
WARNING: An exception was thrown by TimerTask.
org.jboss.netty.channel.ChannelException: Failed to open a socket.
    at org.jboss.netty.channel.socket.nio.NioClientSocketChannel.newSocket(NioClientSocketChannel.java:49)
    at org.jboss.netty.channel.socket.nio.NioClientSocketChannel.<init>(NioClientSocketChannel.java:83)
    at org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory.newChannel(NioClientSocketChannelFactory.java:139)
    at org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory.newChannel(NioClientSocketChannelFactory.java:86)
    at org.jboss.netty.bootstrap.ClientBootstrap.connect(ClientBootstrap.java:218)
    at org.jboss.netty.bootstrap.ClientBootstrap.connect(ClientBootstrap.java:188)
    at akka.remote.netty.ActiveRemoteClient.connect(NettyRemoteSupport.scala:470)
    at akka.remote.netty.ActiveRemoteClientHandler$$anonfun$channelClosed$1$$anon$4.run(NettyRemoteSupport.scala:599)
    at org.jboss.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:519)
    at org.jboss.netty.util.HashedWheelTimer$Worker.notifyExpiredTimeouts(HashedWheelTimer.java:440)
    at org.jboss.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:379)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.net.SocketException: Too many open files
    at sun.nio.ch.Net.socket0(Native Method)
    at sun.nio.ch.Net.socket(Net.java:323)
    at sun.nio.ch.Net.socket(Net.java:316)
    at sun.nio.ch.SocketChannelImpl.<init>(SocketChannelImpl.java:101)
    at sun.nio.ch.SelectorProviderImpl.openSocketChannel(SelectorProviderImpl.java:60)
    at java.nio.channels.SocketChannel.open(SocketChannel.java:142)
    at org.jboss.netty.channel.socket.nio.NioClientSocketChannel.newSocket(NioClientSocketChannel.java:47)
    ... 11 more

Answer 1

已在Akka 2.0-M1中修复，我现在已将修复程序向后移植到1.3，它将在下一个RC中。