Hadoop配置出错信息汇总
1：INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 0 time(s).
运行
ximo@Ubuntu:~$ hadoop fs -ls
14/01/08 22:01:41 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 0 time(s).
14/01/08 22:01:42 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 1 time(s).
14/01/08 22:01:43 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 2 time(s).
14/01/08 22:01:44 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 3 time(s).
14/01/08 22:01:45 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 4 time(s).
14/01/08 22:01:46 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 5 time(s).
14/01/08 22:01:47 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 6 time(s).
14/01/08 22:01:48 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 7 time(s).
14/01/08 22:01:49 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 8 time(s).
14/01/08 22:01:50 INFO ipc.Client: Retrying connect to server: localhost/127.0.0.1:12200. Already tried 9 time(s).
mkdir: Call From Lenovo-G460-LYH/127.0.0.1 to localhost:12200 failed on connection exception: Java.net.ConnectException: 拒绝连接; For more details see:
有几种原因：
1）hadoop配置
主要是$HADOOP_HOME/conf/hdfs-site.xml、mapred-site.xml、core-site.xml中的配置是否正确，伪分布式模式可以参考前面的blog，或是网上的文章，一大堆一大堆的。
2）机器连不通
如果是分布式的，还要看hadoop客户端机器能不能ping通hdfs机器，注意hdfs的端口号
3）namenode没有启动（本人是这种原因）
$stop-all.sh 如果出现no namenode stop则表示是namenode的问题
$hadoop namenode -format
$start-all.sh
4）其他。
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