最近，要把原来基于Ubuntu下配置的Hadoop集群迁移到RHEL 5下，结果在启动的时候，出现了莫名其妙的问题：
Namenode进程启动起来了，但是在登录到Datanode上启动集群slaves的时候，出现了Datanode无法连接到Namenode的问题，根据Datanode日志，可以很容易地定位到问题，肯定是在集群启动之初，Datanode向Namenode注册的时候失败了，在Datanode端查看异常信息，如下所示：
[shirdrn@slave-01 ~]$ tail -500f hadoop/storage/logs/hadoop-shirdrn-datanode-slave-01.log 2012-02-20 23:54:02,011 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: /************************************************************ STARTUP_MSG: Starting DataNode STARTUP_MSG: host = slave-01/192.168.0.181 STARTUP_MSG: args = [] STARTUP_MSG: version = 0.22.0 STARTUP_MSG: classpath = /home/shirdrn/hadoop/hadoop-0.22.0/bin/../conf:/home/shirdrn/installation/jdk1.6.0_30/lib/tools.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/..:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-common-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-common-test-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-0.22.0-sources.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-ant-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-test-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-test-0.22.0-sources.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-mapred-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-mapred-0.22.0-sources.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-mapred-examples-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-mapred-test-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-mapred-tools-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ant-1.6.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ant-1.7.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ant-launcher-1.7.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/asm-3.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/aspectjrt-1.6.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/aspectjtools-1.6.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/avro-1.5.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/avro-compiler-1.5.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/avro-ipc-1.5.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-cli-1.2.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-codec-1.4.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-collections-3.2.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-daemon-1.0.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-el-1.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-httpclient-3.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-lang-2.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-logging-1.1.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-logging-api-1.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-net-1.4.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/core-3.1.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ecj-3.5.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/guava-r09.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/hsqldb-1.8.0.10.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jackson-core-asl-1.7.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jackson-mapper-asl-1.7.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jasper-compiler-5.5.12.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jasper-runtime-5.5.12.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jdiff-1.0.9.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jets3t-0.7.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jetty-6.1.26.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jetty-util-6.1.26.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsch-0.1.42.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsp-2.1-glassfish-2.1.v20091210.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsp-2.1-jetty-6.1.26.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsp-api-2.1-glassfish-2.1.v20091210.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/junit-4.8.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/kfs-0.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/log4j-1.2.16.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/mockito-all-1.8.2.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/mockito-all-1.8.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/oro-2.0.8.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/paranamer-2.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/paranamer-ant-2.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/paranamer-generator-2.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/qdox-1.12.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/servlet-api-2.5-20081211.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/slf4j-api-1.6.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/snappy-Java-1.0.3.2.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/velocity-1.6.4.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/xmlenc-0.52.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsp-2.1/*.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/..:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../conf:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-0.22.0-sources.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-ant-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-test-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-test-0.22.0-sources.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ant-1.6.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ant-1.7.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ant-launcher-1.7.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/asm-3.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/aspectjrt-1.6.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/aspectjtools-1.6.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/avro-1.5.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/avro-compiler-1.5.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/avro-ipc-1.5.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-cli-1.2.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-codec-1.4.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-collections-3.2.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-daemon-1.0.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-el-1.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-httpclient-3.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-lang-2.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-logging-1.1.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-logging-api-1.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-net-1.4.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/core-3.1.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ecj-3.5.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/guava-r09.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/hsqldb-1.8.0.10.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jackson-core-asl-1.7.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jackson-mapper-asl-1.7.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jasper-compiler-5.5.12.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jasper-runtime-5.5.12.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jdiff-1.0.9.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jets3t-0.7.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jetty-6.1.26.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jetty-util-6.1.26.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsch-0.1.42.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsp-2.1-glassfish-2.1.v20091210.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsp-2.1-jetty-6.1.26.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsp-api-2.1-glassfish-2.1.v20091210.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/junit-4.8.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/kfs-0.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/log4j-1.2.16.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/mockito-all-1.8.2.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/mockito-all-1.8.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/oro-2.0.8.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/paranamer-2.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/paranamer-ant-2.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/paranamer-generator-2.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/qdox-1.12.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/servlet-api-2.5-20081211.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/slf4j-api-1.6.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/snappy-java-1.0.3.2.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/velocity-1.6.4.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/xmlenc-0.52.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/..:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-0.22.0-sources.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-ant-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-test-0.22.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../hadoop-hdfs-test-0.22.0-sources.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ant-1.6.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ant-1.7.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ant-launcher-1.7.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/asm-3.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/aspectjrt-1.6.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/aspectjtools-1.6.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/avro-1.5.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/avro-compiler-1.5.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/avro-ipc-1.5.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-cli-1.2.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-codec-1.4.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-collections-3.2.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-daemon-1.0.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-el-1.0.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-httpclient-3.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-lang-2.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-logging-1.1.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-logging-api-1.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/commons-net-1.4.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/core-3.1.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/ecj-3.5.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/guava-r09.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/hsqldb-1.8.0.10.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jackson-core-asl-1.7.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jackson-mapper-asl-1.7.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jasper-compiler-5.5.12.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jasper-runtime-5.5.12.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jdiff-1.0.9.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jets3t-0.7.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jetty-6.1.26.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jetty-util-6.1.26.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsch-0.1.42.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsp-2.1-glassfish-2.1.v20091210.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsp-2.1-jetty-6.1.26.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/jsp-api-2.1-glassfish-2.1.v20091210.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/junit-4.8.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/kfs-0.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/log4j-1.2.16.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/mockito-all-1.8.2.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/mockito-all-1.8.5.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/oro-2.0.8.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/paranamer-2.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/paranamer-ant-2.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/paranamer-generator-2.3.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/qdox-1.12.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/servlet-api-2.5-20081211.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/slf4j-api-1.6.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/snappy-java-1.0.3.2.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/velocity-1.6.4.jar:/home/shirdrn/hadoop/hadoop-0.22.0/bin/../lib/xmlenc-0.52.jar STARTUP_MSG: build = -r 1207774; compiled by 'jenkins' on Sun Dec 4 00:57:22 UTC 2011 ************************************************************/ 2012-02-20 23:54:02,416 WARN org.apache.hadoop.hdfs.server.common.Util: Path /home/shirdrn/hadoop/storage/data/a should be specified as a URI in configuration files. Please update hdfs configuration. 2012-02-20 23:54:02,417 WARN org.apache.hadoop.hdfs.server.common.Util: Path /home/shirdrn/hadoop/storage/data/b should be specified as a URI in configuration files. Please update hdfs configuration. 2012-02-20 23:54:02,417 WARN org.apache.hadoop.hdfs.server.common.Util: Path /home/shirdrn/hadoop/storage/data/c should be specified as a URI in configuration files. Please update hdfs configuration. 2012-02-20 23:54:03,128 WARN org.apache.hadoop.util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 2012-02-20 23:54:04,373 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.0.180:9000. Already tried 0 time(s). 2012-02-20 23:54:05,376 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.0.180:9000. Already tried 1 time(s). 2012-02-20 23:54:06,379 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.0.180:9000. Already tried 2 time(s). 2012-02-20 23:54:07,382 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.0.180:9000. Already tried 3 time(s). 2012-02-20 23:54:08,384 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.0.180:9000. Already tried 4 time(s). 2012-02-20 23:54:09,385 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.0.180:9000. Already tried 5 time(s). 2012-02-20 23:54:10,387 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.0.180:9000. Already tried 6 time(s). 2012-02-20 23:54:11,389 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.0.180:9000. Already tried 7 time(s). 2012-02-20 23:54:12,426 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.0.180:9000. Already tried 8 time(s). 2012-02-20 23:54:13,432 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.0.180:9000. Already tried 9 time(s). 2012-02-20 23:54:13,445 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Call to master/192.168.0.180:9000 failed on local exception: java.net.NoRouteToHostException: No route to host at org.apache.hadoop.ipc.Client.wrapException(Client.java:1063) at org.apache.hadoop.ipc.Client.call(Client.java:1031) at org.apache.hadoop.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:198) at $Proxy4.getProtocolVersion(Unknown Source) at org.apache.hadoop.ipc.WritableRpcEngine.getProxy(WritableRpcEngine.java:235) at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:275) at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:206) at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:185) at org.apache.hadoop.ipc.RPC.waitForProxy(RPC.java:169) at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:262) at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1567) at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1510) at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1533) at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1680) at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1690) Caused by: java.net.NoRouteToHostException: No route to host at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567) at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206) at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:373) at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:416) at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:504) at org.apache.hadoop.ipc.Client$Connection.access$2000(Client.java:206) at org.apache.hadoop.ipc.Client.getConnection(Client.java:1164) at org.apache.hadoop.ipc.Client.call(Client.java:1008) ... 13 more 2012-02-20 23:54:13,447 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: /************************************************************ SHUTDOWN_MSG: Shutting down DataNode at slave-01/192.168.0.181 ************************************************************/