Comments (6)
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Hadoop
离线计算平台
现在Hadoop项目主要包括两个部分:
- HDFS
- Map Reduce
其他部分都独立升级成顶级项目,比如Zookeeper。
HBASE
列存储的Nosql数据库。Hadoop平台。解决大数据上半结构化存储的问题。
Pig & Hive
两个都是脚本语言,供客户使用类似SQL的语言来从Hadoop平台(HBASE)查询数据。
Pig 不需要预处理数据;Hive需要预先处理数据。
Pig是雅虎开源;Hive是Facebook开源
Oozie
实际用的不多
Zookeeper
对标谷歌的Chubby。
Avro
一个RPC框架,类似Thrift,但没Thrift好用。
Elephant-bird
处理二进制的序列化数据(比如Thrift的通信log),供Pig使用。Pig本身只能访问文本数据。
from blog.
Thrift
Facebook开源的跨语言的RPC框架。
from blog.
合约广告简介
1. 直接媒体购买
供给方:广告排期系统
- 帮助媒体自动执行多个合同的排期
- 不提供受众定向,可以将广告素材直接插入页面
需求方:代理商
- 帮助广告商策划和执行排期
- 用姜堰和人工满足广告商质和量的需求
代表
- 4A公司
2. 担保式投送与广告投放
担保式投送(Guaranteed Delivery,GD)
- 基于合约的广告机制,约定的量未完成需要向广告商补偿
- 量(Quantity)优先于质(Quality)的销售模式
- 多采用千次展示付费(Cost per Mille, CPM)方式结算
广告投放机(Ad server)
- CPM方式必然要求广告投送由服务端完成决策
- 受众定向,CTR预测和流量预测是广告投放机的基础
- GD合约下,投放机满足各合约的量,并尽可能优化各广告主流量的质
from blog.
合约广告投送系统
from blog.
竞价广告系统和合约广告系统是两种并列的,不同的广告系统
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