+ Hbase: Hadoop Database B. Ramamurthy. + Motivation-1 HDFS itself is “big” Why do we need “hbase” that is bigger and more complex? Word count, web logs.

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Presentation transcript:

+ Hbase: Hadoop Database B. Ramamurthy

+ Motivation-1 HDFS itself is “big” Why do we need “hbase” that is bigger and more complex? Word count, web logs …are simple compared to web pages…consider what a web crawler encounters…

+ Introduction Persistence is realized (implemented) in traditional applications using Relational Database Management System (RDBMS) Relations are expressed using tables and data is normalized Well-founded in relational algebra and functions Related data are located together However social relationship data and network demand different kind of data representation Relationships are multi-dimensional Data is by choice not normalized (i.e, inherently redundant) Column-based tables rather than row-based (Consider Friends relation in Facebook) Sparse table Solution is Hbase: Hbase is database built on HDFS

+ Motivation-2 Google: GFS  Big Table  Colossus Facebook: HDFS  Hive  Cassandra  Hbase Yahoo: HDFS  Hbase To source a MR workflow and to sink the output of MR workflow; To organize data for large scale analytics To organize data for querying To organize data for warehousing; intelligence discovery NO-SQL (see salesforce.com) Compare storing a Bank Account details and a Facebook User Account details

+ Hbase Hbase reference : Main concept: millions of rows and billions of columns on top of commodity infrastructure (say, HDFS) Hbase is a data repository for big-data It can be a source and sink to HDFS workflow Hbase includes base classes for supporting and backing MR workflows, Pig and Hive as sink as well as source

+ When to use Hbase? When you need high volume data to be stored Un-structured data Sparse data Column-oriented data Versioned data (same data template, captured at various time, time-elapse data) When you need high scalability (you are generating data from an MR workflow: you need to store sink it somewhere…) When you have long rows that a table needs to be split within a traditional row…shrading into horizontal partition.

+ Hbase: A Definitive Guide By George Lars Online version available Also look at architecture-101-storage.htmlhttp:// architecture-101-storage.html

+ Column-based

+ Hbase Architecture

+ Data Model Table Row# is some uninterrupted number Column Families (courses: mth309, courses:cse241) Region Region File