Avery Ching commented on GIRAPH-29:

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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