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update cdh version ,but cdh use old conf ,problem solve
最近升级cdh版本,从4.5 升级到 5.0.0 beta-2 但是升级后,发现/etc/alternatives 路径下的软链接还是只想旧的4.5 版本,而且hadoop环境也是沿用4.5 的版本conf,导致hive不能正常使用,报错为hdfs 的版本不对。 后面使用strace工具查看,发现它...
分类:其他好文   时间:2014-06-07 02:44:21    阅读次数:248
每天努力一点之SQL(二) count sum case when then group by
1.select sum(CASE WHEN A.[STATUS]=0 THEN 1 ELSE 0 end) as a1,sum(CASE A.[STATUS] WHEN 1 THEN 1 ELSE 0 end) as a2,sum(CASE A.[STATUS] WHEN 2 THEN 1 ELS...
分类:数据库   时间:2014-06-04 21:10:46    阅读次数:513
Disable keyboard input on Android TimePicker
try to use:myTimePicker.setDescendantFocusability(TimePicker.FOCUS_BLOCK_DESCENDANTS);to disable focus on the text views of the internal NumberPickers...
分类:移动开发   时间:2014-06-04 20:02:57    阅读次数:406
Climbing Stairs
You are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb...
分类:其他好文   时间:2014-06-04 19:53:34    阅读次数:173
Anagrams
Given an array of strings, return all groups of strings that are anagrams.Note: All inputs will be in lower-case.classSolution{public:vectoranagrams(v...
分类:其他好文   时间:2014-06-04 19:29:39    阅读次数:247
SQL总结(一)基本查询
本文希望通过简单的总结,把常用的查询方法予以总结,希望能够明确在心主要涵盖:模糊查询、排序、分组、集合函数、TOP、Case包括:Between、In、Like、And、Or、Order by包括:Group by、Distinct、MAX\MIN、Avg、Count、Sum、Having、Top、...
分类:数据库   时间:2014-05-29 23:13:46    阅读次数:456
Java高级程序设计第三版:基本概念
严格模式function fun(){ "use strict"; //启用严格模式,作用域函数 } "use strict"; //全局变量变量定义需要用var,如果没有通过var定义的变量会由于相应变量不会马上有定义而导致不必要的混乱。数据类型5种基本数据类型:Undefined、Nu...
分类:编程语言   时间:2014-05-29 18:02:43    阅读次数:372
How to enable DateTimePicker to use both date and time z
Recently in one of my project I needed to have an option to display the DateTimePicker allowing user to pick both the date and the time. When I drag t...
分类:其他好文   时间:2014-05-29 17:46:20    阅读次数:239
vim 查看某字符串出现的次数
http://blog.chinaunix.net/uid-23577393-id-1751983.htmlTo count how often any pattern occurs in the current buffer use the substitutecommand and add th...
分类:其他好文   时间:2014-05-29 17:37:03    阅读次数:217
FreeRTOS的application assignment
Please follow the steps precisely in order to complete the objectives of the assignment. If you use the C++ FreeRTOS framework, it should make the ass...
分类:移动开发   时间:2014-05-29 16:53:33    阅读次数:483
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