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Pig wiki:http://wiki.apache.org/pig/

Yahoo Pig 有如下特點：
1、專注於大量資料集分析（a solution that has been custom designed for a specific problem）；
2、運行在 Cluster 的計算平台架構上，Yahoo Pig 提供了抽象、簡化平行計算讓普通用戶使用；這些抽象自動把用戶請求 queries ，並翻譯成有效的並行計畫，然後在 physical Cluster 上執行這些計畫
3、提供類似 SQL 的操作語法
4、開放源代碼

以下採自 Pig 專案網站對 Pig 的說明：

The highest abstraction layer in Pig is a query language interface, whereby users express data analysis tasks as queries, in the style of SQL or Relational Algebra. Queries articulate data analysis tasks in terms of set-oriented transformations, e.g. apply a function to every record in a set, or group records according to some criterion and apply a function to each group. Set-oriented transformations are inherently amenable to parallel evaluation, because the processing logic for each record (or group of records) is self-contained, and the order in which outputs are produced is immaterial. The layers between the query interface and the raw cluster hardware are responsible for planning and executing efficient parallel evaluation strategies for queries. In designing these intermediate layers, we focus on re-use of derived data, joint evaluation of multiple (sub) queries, and intelligent data placement and replication strategies.

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