hadoop的坑

1：Error: Could not find or load main class namenode-format(进行格式化的时候，需要注意hadoop namenode   -format    [namenode与format有空格])

2：put: `.': No such file or directory（hadoop fs -put /usr/apps/hadoop-2.7.7/a.txt[有这个文件，处理：]换命令：

/main/hadoop-2.8.4/bin/hadoop fs -put word_i_have_a_dream.txt /word.txt

[hadoop@node1 hadoop-2.8.4]$（前面绝对路径）(路径下有这个文件)

）

3:

put: Call From hadoop01/10.206.0.5 to hadoop01:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused