shanjiawei22的博客

原创 Ubuntu16.04安装LightGBM

原创 Secondarynamenode无法启动： checkpoint directory does not exist or is not accessible.

问题：使用start-all.sh或start-dfs.sh后secondarynamenode没有启动。使用 hdfs secondarynamenode命令，查看错误信息提示 Directory /usr/local/hadoop/tmp/dfs/namesecondary is in an inconsistent state: checkpoint directory does not e...

原创 pandas的DataFrame对列的常用操作

1.列合并有时需要对DataFrame的几个列合并dataframe['newcolumn']=dataframe['columns1']+dataframe['columns2']+dataframe['columns3']如果有列数据类型不是字符串:dataframe['newcolumn']=dataframe['columns1'].map(str)+dataframe['columns2...

转载 aa

http://blog.youkuaiyun.com/liuwei0376/article/details/60877878http://www.cnblogs.com/purstar/p/6293605.htmlhttp://blog.youkuaiyun.com/a2011480169/article/details/51544664    //flume架构及应用http://blog.youkuaiyun.com