An introduction to Apache Gora

Apache Gora
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What is it ?

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Gora – Nutch

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Supports

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Data Access

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API's

www.semtech-solutions.co.nz

info@semtech-solutions.co.nz

Apache Gora – What is it ?
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Provides for Big Data
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Persistence

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In memory data model
Data store abstraction

Supports persisting to
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Key/value stores

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Document stores

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Column stores

RDBMS's

Supports use of Hadoop



Apache Gora – What is it ?
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Released via Apache 2 license

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Written in Java

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Offers a persistence framework

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Designed for big data applications

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Used by Nutch 2.x for web crawl data storage

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Used for
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Persistence

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Indexing

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Analytics



Apache Gora – Nutch
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Nutch 2.x now uses Gora
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Abstracted storage

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Data store independence

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Handles object to persistent mappings

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Use various NoSql solutions



Apache Gora – Supports
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Gora supports the following
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Apache Accumulo

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Apache Cassandra

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Apache Hbase

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Amazon DynamoDB

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Pig

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Hive

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Cascading

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MapReduce



Apache Gora – Data Access
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Java API for data access
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Independent of location

Core Gora API's
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Store

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Persistency

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Query

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MapReduce



Apache Gora – Store API
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Java API – org.apache.gora.store.*
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DataStore handles object persistence

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DataStore methods process objects
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Persist
Fetch
Query
Delete



Apache Gora – Persistency API
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Java API – org.apache.gora.persistency.*
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Core classes
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BeanFactory
– Construct keys
Persistent
– Persist objects
State
– State managed through StateManager
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NEW, CLEAN (UNMODIFIED)
DIRTY (MODIFIED), DELETED



Apache Gora – Query API
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Java API – org.apache.gora.query.*
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Core classes
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Query
– Constructed via DataStore
PartitionQuery
– Divide results of Query into partitions.
– Run queries on data nodes.
– Generate Hadoop InputSplits
Result



Apache Gora – MapReduce API
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Java API – org.apache.gora.mapreduce.*
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GoraMapper

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GoraReducer

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ALL Record Counter

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Reader

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Writer

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Hadoop / Avro
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Serialise
De-serialise
Persistent



Contact Us
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Feel free to contact us at
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We offer IT project consultancy

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We are happy to hear about your problems

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You can just pay for those hours that you need

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To solve your problems

An introduction to Apache Gora

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