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How |
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to |
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read |
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data |
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from |
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a |
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Hive |
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table, |
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transform |
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it, |
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and |
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write |
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it |
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to |
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a |
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Hive |
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table |
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within |
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the |
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workflow |
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of |
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a |
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PDI |
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job. |
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Prerequisites
In order follow along with this how-to
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guide
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you
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will
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need
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the
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following:
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- Hadoop
- Pentaho Data Integration
- Hive
Sample Files
The source data for this guide will reside in a Hive table called weblogs. If you have previously completed the Loading Data into Hive guide, then you can skip to #Create a Database Connection to Hive. If not, then you will need the following datafile and perform the #Create a Hive Table instructions before proceeding.
The sample data file needed for the #Create a Hive Table instructions is:
File Name | Content |
Tab-delimited, parsed weblog data |
NOTE: If you have previously completed the Using Pentaho MapReduce to Parse Weblog Data guide, then the necessary files will already be in the proper location.
This file should be placed in the /weblogs/parse directory of the CLDB using the following commands.
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hadoop fs -mkdir /weblogs
hadoop fs -mkdir /weblogs/parse
hadoop fs -put weblogs_parse.txt /weblogs/parse/part-00000
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Step-By-Step Instructions
Setup
Start Hadoop if it is not already running.
Start Hive Server if it is not already running.
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