高考过去快两周了，对于我而言，已经是七年。七年本是可以抹掉很多记忆的，但不适用于高考。而由于不争气的我参加过两次高考，这种记忆尤为深刻。
第一次高考感觉来的很突然，虽然也在复习，也在看着黑板上的倒计时，也在毕业留影，但当它临近时，依旧还是不知所措，以至于我对于第一次高考的过程印象不是很深刻。
那些年我们一起走过的高考
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Creating Amazon EMR job using Java API
Premature optimization is the root of all evil
Today during the code review, an important lesson was learned.
If you wrote Hadoop reducer before, you will know that one Reducer host will have many keys assigned to it based on the partition method. And in the run() method, it will iterate the keys and corresponding values and pass them to reducer() method, so each call of reducer() will handle only one key and its values.
读余光中《寻李白》有感而作
酒在哪？剑在哪？
长啸一声，便是那狂，便是那痴
列子御风，我辈又岂草履于世？
庄周梦蝶，晓梦之中，既是那蝶，也欲冲破浩瀚九天
错它个破碎
笑它个七窍流血，断肠
做半个神仙，小半个妖怪
饮了那霸王的胆魄
牵着她易安的温柔
便是，那万面玲珑
活它个电脑，活它个睡觉，活它个出人头地，活它个人
附余光中先生《寻李白》：
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fix STATIC_URL is empty in Django
When using static files in my Django application, the STATIC_URL is empty even I set it in the setting.py, after a few research, here is how I fixed it.
My static image files are located at movie/static/img (my application is movie)
1. in views.py
from django.template import RequestContext
if you use render_to_response, make sure you add context_instance=RequestContext(request) in it,
render_to_response('movie/index.html', {'movie_list': movie_list}, context_instance=RequestContext(request));
setup Django 1.4 on Godaddy linux economy host
In case you want to use Django framework in Godaddy’s Linux Economy Host, here is the steps:
1. Godaddy has virtualenv installed, so first, create a virtual environment venv: (I use $HOME/lib/ for all the installed stuff below)
cd ~/ mkdir lib cd lib virtualenv --no-site-packages venv
The python package folder is $HOME/lib/venv/lib/python2.7/site-packages
2. Install the latest Django through pip
pip install Django
setup Git on Godaddy linux economy host
There is no version control on Godaddy linux host, which makes the code deployment very painful. So here is how to setup Git on the Godaddy host.
In this tutorial, we set repository on the Godaddy host.
1. download the pre-build git binaries, Godaddy uses CentOS, and the binary is built under CentOS. (Thanks to here)
In your $HOME folder on Godaddy host
% mkdir lib % cd lib % mkdir git % cd git % wget http://www.lichun.cc/resources/centos5.2-git.tar.gz % tar -xvzf centos5.2-git.tar.gz
Android 4.0 使用技巧
(本贴将持续更新)
- 截图: .音量减小键和电源键同时按 (Volume Down + Power, Hold for 1 second)
Hadoop MultipleInputs sample usage
MultipleInputs is a feature that supports different input formats in the MapReduce.
For example, we have two files with different formats:
(1) First file format:
VALUE
(2) Second file format:
VALUE ADDITIONAL
In order to read the custom format, we need to write Record Class, RecordReader, InputFormat for each one.
InputFormat is needed by MultipleInputs, an InputFormat use RecordReader to read the file and return value, the value is a Record Class instance
Here is the implementation:
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Hadoop GenericWritable sample usage
GenericWritable is another Hadoop feature that let you pass values with different types to the reducer, it’s a wrapper for Writable instances.
Suppose we have different input formats (see MultipleInput), one is FirstClass and another one is SecondClass.(note: you can have multiple, not just 2). And you want to include both of them in your reducer based on the same key value, here is what you can do:
We use the same code used in MultipleInput.