HBase權(quán)威指南

內(nèi)容概要

如果你正在尋找一種具備可伸縮性的存儲解決方案來適應(yīng)幾乎沒有窮盡的數(shù)據(jù)的話，喬治編寫的這本《HBase權(quán)威指南(影印版)》將可以向你表明
Apache HBase完全能夠滿足你的需求。作為Google
Big]hble架構(gòu)的開源實現(xiàn)，HBase能夠支持?jǐn)?shù)以十億計的記錄數(shù)和數(shù)以百萬計的字段，與此同時它還能夠保證常量級的讀寫性能。很多IT管理層正在質(zhì)疑HBase。而《HBase權(quán)威指南(影印版)》提供了很多有意義的答案，無論你是否正在評估這種非關(guān)系型數(shù)據(jù)庫或者正試圖立刻把它付諸實踐。

作者簡介

La
George，HBase項目組成員，他是cloudera的解決方案架構(gòu)師，提供了關(guān)于Hadoop和HBase的技術(shù)支持、咨詢服務(wù)和培訓(xùn)工作。他曾經(jīng)在多個不同的Hadoop用戶組會議發(fā)言，并且在如布魯塞爾的自由及開源軟件開發(fā)者歐洲會議(FOSDEM)這樣的大型會議中發(fā)言。

書籍目錄

Foreword
Preface
1.Introduction
2.1tallation
3.Client API：The Basics
4.Client APh Advanced Features
5.Client APh Administrative Features
6.Available Clients
7.MapReduce Integration
8.Architecture
9.Advanced Usage
10.Cluster Monitoring
11.Performance Tuning
12.Cluster Administration
A.HBase Configuration Properties
B.RoadMap
C.Upgrade from Previous Releases
D.Distributio
E.Hush SQL Schema
F.HBase Veus Bigtable
Index

章節(jié)摘錄

版權(quán)頁：   The Result class When you retrieve data using the get ( ) calls,you receive an instance of the Result class that contains all the matching cells.It provides you with the means to access everything that was returned from the server for the given row and matching the specified query,such as column family,column qualifier,timestamp,and so on.There are utility methods you can use to ask for specific results-just as Example 3-8 used earlier-using more concrete dimensions.If you have,for example,asked the server to return all columns of one specific column family,you can now ask for specific columns within that family.In other words,you need to call get( ) with just enough concrete information to be able to process the matching data on the client side.The functions provided are: byte[] getValue(byte[] family,byte[] qualifier) byte[] value( ) byte[] getRow( ) int size( ) boolean isEmpty( ) KeyValue[ ] raw( ) List list( ) The getValue( ) call allows you to get the data for a specific cell stored in HBase.As you cannot specify what timestamp-in other words,version-you want,you get the new—est one.The value( ) call makes this even easier by returning the data for the newest cell in the first column found.Since columns are also sorted lexicographically on the server,this would return the value of the column with the column name (including family and qualifier) sorted first.You saw getRow( ) before： it returns the row key,as specified when creating the current instance of the Get class,size ( ) is returning the number of KeyValue instances the server has returned.You may use this call-or isEmpty( ),which checks if size( ) returns a number greater than zero-to check in your own client code if the retrieval call returned any matches.

編輯推薦

《HBase權(quán)威指南(影印版)(英文版)》提供了很多有意義的答案，無論你是否正在評估這種非關(guān)系型數(shù)據(jù)庫或者正試圖立刻把它付諸實踐。

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