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Hadoop集群报错Caused by: java.net.NoRouteToHostException: No route to host

2013-01-30 23:48:15| 分类： Hadoop | 标签： |举报 |字号大中小订阅

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问题描述 | Problem Description

前两天把Hadoop集群搭起来之后出现了一个问题：

从master端启动hadoop，然后jps，可以看到NameNode、JobTracker、SecondaryNameNode均已启动，

但是slave端的DataNode则无法启动，或者启动之后几秒就自动关闭了，所以带着问题查看了log信息。

[root@slave1 hadoop-1.0.4]# cat logs/hadoop-root-datanode-slave1.log

2013-01-30 07:13:36,699 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG:

/************************************************************

STARTUP_MSG: Starting DataNode

STARTUP_MSG: host = slave1/10.0.3.124

STARTUP_MSG: args = []

STARTUP_MSG: version = 1.0.4

STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r 1393290; compiled by 'hortonfo' on Wed Oct 3 05:13:58 UTC 2012

************************************************************/

2013-01-30 07:13:36,913 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties

2013-01-30 07:13:36,924 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered.

2013-01-30 07:13:36,925 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).

2013-01-30 07:13:36,925 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started

2013-01-30 07:13:37,031 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered.

2013-01-30 07:13:38,357 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/10.0.3.123:9000. Already tried 0 time(s).

2013-01-30 07:13:39,359 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/10.0.3.123:9000. Already tried 1 time(s).

2013-01-30 07:13:40,360 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/10.0.3.123:9000. Already tried 2 time(s).

2013-01-30 07:13:41,373 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/10.0.3.123:9000. Already tried 3 time(s).

2013-01-30 07:13:43,376 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/10.0.3.123:9000. Already tried 4 time(s).

2013-01-30 07:13:44,377 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/10.0.3.123:9000. Already tried 5 time(s).

2013-01-30 07:13:45,379 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/10.0.3.123:9000. Already tried 6 time(s).

2013-01-30 07:13:46,380 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/10.0.3.123:9000. Already tried 7 time(s).

2013-01-30 07:13:47,381 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/10.0.3.123:9000. Already tried 8 time(s).

2013-01-30 07:13:48,383 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/10.0.3.123:9000. Already tried 9 time(s).

2013-01-30 07:13:48,385 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Call to master/10.0.3.123:9000 failed on local exception: java.net.NoRouteToHostException: No route to host

at org.apache.hadoop.ipc.Client.wrapException(Client.java:1107)

at org.apache.hadoop.ipc.Client.call(Client.java:1075)

at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:225)

at $Proxy5.getProtocolVersion(Unknown Source)

at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:396)

at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:370)

at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:429)

at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:331)

at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:296)

at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:356)

at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:299)

at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1582)

at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1521)

at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1539)

at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1665)

at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1682)

Caused by: java.net.NoRouteToHostException: No route to host

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:489)

at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:434)

at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:560)

at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:184)

at org.apache.hadoop.ipc.Client.getConnection(Client.java:1206)

at org.apache.hadoop.ipc.Client.call(Client.java:1050)

... 14 more

问题分析 | Problem Analysis

从log信息中很明显看出slave尝试连接了10次master，均以失败而告终，于是抛出了java.net.NoRouteToHostException

造成出现这个异常的原因一般有二：

防火墙阻挡。
端口被屏蔽。

于是尝试解决。

解决方案 | Problem Solution

将master端的防火墙关闭

然后重新启动Hadoop，slave端的DataNode已成功启动，log信息中也未出现错误信息。

问题成功解决。

问题总结 | Problem Summary

又是防火墙问题 - -#

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