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Hadoop TESTDFSIO occasionally occasionally fail successfully, and throw ConnectionRefused errors

Time:10-04

Recently in learning, hadoop TESTDFSIO installed then do, always throw this wrong, rookie a asked the great spirit show

14/04/09 15:03:36 INFO graphs. The Job: the map reduce 50% 17%
14/04/09 15:03:36 INFO graphs. Job: Task Id: attempt_1396880528923_0010_m_000004_1000, Status: FAILED
The Container launch failed for container_1396880528923_0010_02_000006: java.net.ConnectException: Call From cloud003/172.16.236.18 to localhost: 53883 failed on connection exception: java.net.ConnectException: connection refused. For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
At sun. Reflect. NativeConstructorAccessorImpl. NewInstance0 (Native Method)
At sun. Reflect. NativeConstructorAccessorImpl. NewInstance (NativeConstructorAccessorImpl. Java: 39)
At sun. Reflect. DelegatingConstructorAccessorImpl. NewInstance (DelegatingConstructorAccessorImpl. Java: 27)
The at Java. Lang. Reflect. Constructor. NewInstance (513) Constructor. Java:
At org.apache.hadoop.net.NetUtils.wrapWithMessage NetUtils. Java: (783)
At org.apache.hadoop.net.NetUtils.wrapException NetUtils. Java: (730)
At org, apache hadoop. Ipc. Client. Call (1351). The Client Java:
At org, apache hadoop. Ipc. Client. Call (1300). The Client Java:
At org, apache hadoop. Ipc. ProtobufRpcEngine $Invoker. Invoke (ProtobufRpcEngine. Java: 206)
At com. Sun. Proxy. $Proxy30. StartContainers (Unknown Source)
At org, apache hadoop. Yarn. API. The impl. Pb. Client. ContainerManagementProtocolPBClientImpl. StartContainers (ContainerManagementProtocolPBClientImpl. Java: 96)
At org, apache hadoop. Graphs. V2. The app. The launcher. ContainerLauncherImpl $Container. Launch (ContainerLauncherImpl. Java: 151)
At org, apache hadoop. Graphs. V2. The app. The launcher. ContainerLauncherImpl $EventProcessor. Run (369) ContainerLauncherImpl. Java:
The at Java. Util. Concurrent. ThreadPoolExecutor $Worker. RunTask (ThreadPoolExecutor. Java: 895)
The at Java. Util. Concurrent. ThreadPoolExecutor $Worker. The run (ThreadPoolExecutor. Java: 918)
The at Java. Lang. Thread. The run (Thread. Java: 662)
Under Caused by: java.net.ConnectException: Connection refused
At sun. Nio. Ch. SocketChannelImpl. CheckConnect (Native Method)
At sun. Nio. Ch. SocketChannelImpl. FinishConnect (SocketChannelImpl. Java: 599)
At org.apache.hadoop.net.SocketIOWithTimeout.connect SocketIOWithTimeout. Java: (206)
At org.apache.hadoop.net.NetUtils.connect NetUtils. Java: (529)
At org.apache.hadoop.net.NetUtils.connect NetUtils. Java: (493)
At org, apache hadoop. Ipc. Client $Connection. SetupConnection (547). The Client Java:
At org, apache hadoop. Ipc. Client $Connection. SetupIOstreams (642). The Client Java:
At org, apache hadoop. Ipc. Client $Connection. The access of $2600 (314). The Client Java:
At org, apache hadoop. Ipc. Client. GetConnection (1399). The Client Java:
At org, apache hadoop. Ipc. Client. Call (1318). The Client Java:
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