December 2012
Intermediate to advanced
572 pages
13h 8m
Chinese
Content preview from HBASE技術手冊
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
可用的客戶端
|
277
再一次使用
DUMP
，這次使用關係
S
，最後的結果如下：
grunt>
DUMP S;
(002BB5A52580A8ED,970916150445,margaret laurence the stone angel)
(002BB5A52580A8ED,970916150505,margaret laurence the stone angel)
...
在這個地方，只要在取代在先前程式碼的
LOAD
和
STORE
敘述，繼續處理剩下來的 Pig 練
習課程。要結束這個範例，最後輸入
QUIT
來離開 Grunt shell：
grunt>
QUIT;
$
然而，Pig 對 HBase 的支援，在目前的版本還有些缺點：
沒有版本支援
處理 HBase 儲存單元時，目前沒有辦法指定任意的版本。Pig 只支援最新版本。
固定的欄位對應
Row key 必須是第一個欄位，而且不能被放在其他位置。透過隨後的
FOREACH...GENERATE
敘述，重新編排關係的配置，可以克服此問題。
檢查 Pig 專案網站，看這些特色是否已經被加入。
Cascading
Cascading 是一個給MapReduce 用的替代性API。在執行期間，它會在背後使
用 MapReduce，但在開發階段，使用者不必去想在 Hadoop 上執行時所要建立的
MapReduce 解決方案。
使用的模式很像是一個真實世界的
管線組合
（
pipe assembly
），這裡的資料來源是
水龍
頭
（
tap
）而輸出是
水槽
（
sink
）。這些
管道
（
piped ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.