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https://issues.apache.org/jira/browse/GIRAPH-29?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102142#comment-13102142
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Avery Ching commented on GIRAPH-29:
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No problem, the real issue is that there is little documentation (my fault).
Contrary to MapReduce (map tasks = input splits), workers need not equal input
split from VertexInputFormat. Workers in Giraph process InputSplits as fast as
possible and may process 0 or more InputSplits.
> Implement TextVertexInputFormat for text-format graph data
> ----------------------------------------------------------
>
> Key: GIRAPH-29
> URL: https://issues.apache.org/jira/browse/GIRAPH-29
> Project: Giraph
> Issue Type: New Feature
> Components: bsp
> Reporter: Hyunsik Choi
> Assignee: Hyunsik Choi
> Priority: Minor
> Fix For: 0.70.0
>
>
> Supporting text-format graph data would be nice. It is helpful for developing
> graph algorithms and debugging because text-format graph data are
> human-readable and enable users to easily write sample data sets.
> Furthermore, text-format data are exchangeable regardless of operating
> systems or programming languages.
> So, we need a basic InputFormat to help users develop user-defined
> InputFormat classes to deal text-represented graph data sets.
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