执行“hdfs dfs -ls”时报ConnectException
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 ', 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本文参与 腾讯云自媒体分享计划，分享自作者个人站点/博客。
原始发表：2014-04-17 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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