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https://issues.apache.org/jira/browse/MAPREDUCE-4630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466430#comment-13466430
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alex gemini commented on MAPREDUCE-4630:
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shouldn't one fileformat only need one blocksize? It's like a final value for 
each format, why we need an API to set it?
                
> API for setting dfs.block.size
> ------------------------------
>
>                 Key: MAPREDUCE-4630
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4630
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>         Environment: Hadoop 2
>            Reporter: Radim Kolar
>            Priority: Minor
>
> Add API for setting block size in Tool while creating MR job.
> I propose
> FileOutputFormat.setBlockSize(Job job, int blocksize);
> which sets dfs.block.size

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