Hadoop Large Document Collection Data Preparation

Created: 2012-08-17 12:19:39 Last updated: 2012-08-18 18:39:26

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Workflow for preparing large document collections for data analysis. Different types of hadoop jobs (Hadoop-Streaming-API, Hadoop Map/Reduce, and Hive) are used for specific purposes.

The *PathCreator components create text files with absolute file paths using the unix command 'find'. The workflow then uses 1) a Hadoop Streaming API component (HadoopStreamingExiftoolRead) based on a bash script for reading image metadata using Exiftool, 2) the Map/Reduce component (HadoopHocrAvBlockWidthMapReduce) presented above, and 3) Hive components for creating data tables (HiveLoad*Data) and performing queries on the result files (HiveSelect).

The code for the two hadoop jobs is available on Github: tb-lsdr-seqfilecreator and tb-lsdr-hocrparser.

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Workflow Components

Authors (1)

Titles (1)

Descriptions (0)

Dependencies (0)

Inputs (2)

Name	Description
hadoop_job_name_prefix	Hadoop job name prefix for
rootpath

Processors (10)

Name	Type	Description
HadoopHocrAvBlockWidthMapReduce	externaltool
HadoopSequenceFileCreator	externaltool
HtmlPathCreator	externaltool
Jp2PathCreator	externaltool
html_extension	stringconstant	Value html
jp2_extension	stringconstant	Value jp2
HadoopStreamingExiftoolRead	externaltool
HiveLoadExifData	externaltool
HiveLoadHocrData	externaltool
HiveSelect	externaltool

Beanshells (0)

Outputs (1)

Name	Description
Out

Datalinks (13)

Source	Sink
HadoopSequenceFileCreator:STDOUT	HadoopHocrAvBlockWidthMapReduce:hdfs_input_dir
hadoop_job_name_prefix	HadoopHocrAvBlockWidthMapReduce:hadoop_job_name_prefix
hadoop_job_name_prefix	HadoopSequenceFileCreator:hadoop_job_name_prefix
HtmlPathCreator:STDOUT	HadoopSequenceFileCreator:hdfs_input_path
rootpath	HtmlPathCreator:rootpath
html_extension:value	HtmlPathCreator:extfilter
rootpath	Jp2PathCreator:rootpath
jp2_extension:value	Jp2PathCreator:extfilter
Jp2PathCreator:STDOUT	HadoopStreamingExiftoolRead:hdfs_input_dir
hadoop_job_name_prefix	HadoopStreamingExiftoolRead:hadoop_job_name_prefix
HadoopStreamingExiftoolRead:STDOUT	HiveLoadExifData:hdfs_result_file
HadoopHocrAvBlockWidthMapReduce:STDOUT	HiveLoadHocrData:hdfs_result_file
HiveSelect:STDOUT	Out

Coordinations (7)

Controller	Target
HadoopSequenceFileCreator	HadoopHocrAvBlockWidthMapReduce
HtmlPathCreator	HadoopSequenceFileCreator
HiveLoadExifData	HiveSelect
HadoopStreamingExiftoolRead	HiveLoadExifData
HiveLoadHocrData	HiveSelect
Jp2PathCreator	HadoopStreamingExiftoolRead
HadoopHocrAvBlockWidthMapReduce	HiveLoadHocrData

Information Workflow Type

Taverna 2

Information Uploader

Sven

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Sven

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jp2
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jpeg2000
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Information Favourited By (1)

Asger Askov Blekinge

Information Statistics

2330 viewings

1293 downloads

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Version History

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Hadoop Large Document Collection Data Preparation

Created by Sven on Friday 17 August 2012 12:19:38 (UTC)

Last edited by Sven on Saturday 18 August 2012 18:39:25 (UTC)