map任务失败 Timed out after 600 secs Container released on a

虽然map任务失败，自动尝试之后成功了，但是对于失败的原因还是想知道下，有了解的么，log如下。
AttemptID:attempt_1469436806452_24272_m_000427_0 Timed out after 600 secs Container released on a *lost* node cleanup failed for container container_1469436806452_24272_01_031048 : org.apache.hadoop.net.ConnectTimeoutException: Call From ip-172-31-255-102/172.31.255.102 to ip-172-31-255-217.cn-north-1.compute.internal:8041 failed on socket timeout exception: org.apache.hadoop.net.ConnectTimeoutException: 20000 millis timeout while waiting for channel to be ready for connect. ch : java.nio.channels.SocketChannel[connection-pending remote=ip-172-31-255-217.cn-north-1.compute.internal/172.31.255.217:8041]; For more details see: http://wiki.apache.org/hadoop/SocketTimeout at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:792) at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:751) at org.apache.hadoop.ipc.Client.call(Client.java:1479) at org.apache.hadoop.ipc.Client.call(Client.java:1412) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229) at com.sun.proxy.$Proxy94.stopContainers(Unknown Source) at org.apache.hadoop.yarn.api.impl.pb.client.ContainerManagementProtocolPBClientImpl.stopContainers(ContainerManagementProtocolPBClientImpl.java:110) at sun.reflect.GeneratedMethodAccessor23.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:191) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102) at com.sun.proxy.$Proxy95.stopContainers(Unknown Source) at org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherImpl$Container.kill(ContainerLauncherImpl.java:206) at org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherImpl$EventProcessor.run(ContainerLauncherImpl.java:379) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.hadoop.net.ConnectTimeoutException: 20000 millis timeout while waiting for channel to be ready for connect. ch : java.nio.channels.SocketChannel[connection-pending