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https://issues.apache.org/jira/browse/MAPREDUCE-2208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607724#comment-13607724
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Marcelo Elias Del Valle commented on MAPREDUCE-2208:
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Oh, just to complement, I realized you possible meant something different from 
your question... You are concerned about a single CSV line be split in two 
among different splits, right? No, that won't happen because I wrote a custom 
reader, that reads N lines at a time. The getSplits method uses the reader to 
correct get N lines and perform the splits, so getSplits will never return half 
of a line, you can actually configure how many lines you want on each split.
Yes, this is also a valid concern and I took care about it. I am sorry, I 
hadn't understood well your question the first time I read it.
                
> Flexible CSV text parser InputFormat
> ------------------------------------
>
>                 Key: MAPREDUCE-2208
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2208
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Lance Norskog
>            Priority: Trivial
>         Attachments: CSVTextInputFormat.java, TestCSVTextFormat.java
>
>
> CSVTextInputFormat is a configurable CSV parser tuned to most of the 
> csv-style datasets I've found. The Hadoop samples I've seen all 
> FileInputFormat and Mapper<LongWritable,Text>. They drop the Longwritable key 
> and parse the Text value as a CSV line. But, they are all custom-coded for 
> the format.
> CSVTextInputFormat takes any csv-encoded file and rearrange the fields into 
> the format required by a Mapper. You can drop fields & rearrange them. There 
> is also a random sampling option to make training/test runs easier.
> Attached are CSVTextInputFormat.java and a unit test for it. Both go into 
> org.apache.hadoop.mapreduce.lib.input under src/java and test/mapred/src.
> This is compiled against hadoop-0.0.20.

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