执行“hdfs dfs -ls”时报ConnectException

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原因可能是指定的端口号9000不对，该端口号由hdfs-site.xml中的属性“dfs.namenode.rpc-address”指定，即为NameNode的RPC服务端口号。

文件上传后，被存储在DataNode的data（由DataNode的hdfs-site.xml中的属性“dfs.datanode.data.dir”指定）目录下，如：

$HADOOP_HOME/data/current/BP-139798373-172.25.40.171-1397735615751/current/finalized/blk_1073741825

文件名中的“blk”是block，即块的意思，默认情况下blk_1073741825即为文件的一个完整块，Hadoop未对它进额外处理。

hdfs dfs -ls hdfs://172.25.40.171:9000

14/04/17 12:04:02 WARN conf.Configuration: mapred-site.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.attempts; Ignoring.

14/04/17 12:04:02 WARN conf.Configuration: mapred-site.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.retry.interval; Ignoring.

14/04/17 12:04:02 WARN conf.Configuration: mapred-site.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.attempts; Ignoring.

14/04/17 12:04:02 WARN conf.Configuration: mapred-site.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.retry.interval; Ignoring.

14/04/17 12:04:02 WARN conf.Configuration: mapred-site.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.attempts; Ignoring.

14/04/17 12:04:02 WARN conf.Configuration: mapred-site.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.retry.interval; Ignoring.

Java HotSpot(TM) 64-Bit Server VM warning: You have loaded library /data/hadoop/hadoop-2.4.0/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.

It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.

14/04/17 12:04:02 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

14/04/17 12:04:03 WARN conf.Configuration: mapred-site.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.attempts; Ignoring.

14/04/17 12:04:03 WARN conf.Configuration: mapred-site.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.retry.interval; Ignoring.

ls: Call From VM-40-171-sles10-64/172.25.40.171 to VM-40-171-sles10-64:9000 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused

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