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https://issues.apache.org/jira/browse/MAPREDUCE-4630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13468733#comment-13468733
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Radim Kolar commented on MAPREDUCE-4630:
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Hadoop Spring support is basic. It does not go into such details. It wraps 
existing functionality in Spring. If there is no setblocksize in hadoop core, 
there will not be in spring wrapper.

I use set blocksize often and adding it into core would be usefull for me 
because i do not have to remember its configuration keyword.
                
> 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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