我正在使用。为什么我在做了FILTER JOIN后LEFT OUTER做了一个错误?
下面是一个修改过的示例:
A = LOAD '$file1' USING PigStorage('\t') AS (idA:int, manufacturer:chararray);
B = LOAD '$file2' USING PigStorage('\t') AS (idB:int, price:float);
C = JOIN A BY idA LEFT OUTER, B BY idB;
D = FILTER C BY price >
总结问题:
- Being relatively new to Ruby/Gems and developing in general, some concepts evade me
- I'm learning about the google-api-client Gem, and am attempting to understand the Basic Usage, and want to know how a developer knows which class to use, when instantiating an ojbect, during the
我创建了自己的合并排序实现,我测试了它是否有效。我怎么也不确定是O(N Log(N))还是O(N^2),你能看看我的代码吗?
SortedList
public abstract class SortedList {
public final ArrayList<Integer> params = new ArrayList<Integer>();
public void add(int... params) {
for (int parameter : params) {
this.params.add(par
谢谢你抽出时间来帮助我解决这个问题。我对Ruby并不熟悉,所以这似乎是一个简单的答案。我创建了一个api,允许Ruby和Angularjs相互交谈。API如下:
class EntriesController < ApplicationController
respond_to :json
protect_from_forgery
def index
respond_with Entry.all
end
def show
respond_with Entry.find(params[:id])
end
def create
respond_with Entr
我只是回顾XEN VM服务器的磁盘IO。我偶然发现了一个DomU,它有固定的写流量。
为了进一步缩小流量,我登录到DomU (CentOS 5,64位)并启动iostat 5。它显示sda1活动,每秒写入130-190块。
磁盘布局:
sda: Whole disk (corresponds to DRBD-device in the Dom0, consist of one LV in the Dom0)
sda1: /
sda2: /var
sda3: LVM-PV for application data, contains one LV mounted as subdirectory