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https://issues.apache.org/jira/browse/HADOOP-1259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12488736
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Raghu Angadi commented on HADOOP-1259:
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Why can't we change NNBench? If fact we did change it once already for checksum 
reasons.

Also this should not be a requirement of ChecksumFileSystem class. This is only 
required by DFS which is one of the many ways files can created.


> DFS should enforce block size is a multiple of io.bytes.per.checksum 
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-1259
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1259
>             Project: Hadoop
>          Issue Type: Improvement
>            Reporter: Raghu Angadi
>
> DFSClient currently does not enforce that dfs.block.size is a multiple 
> io.bytes.per.checksum. This not really problem currently but can future 
> upgrades like HADOOP-1134 (see one of the comments 
> http://issues.apache.org/jira/browse/HADOOP-1134#action_12488542 there). 
> I propose DFSClient should fail loudly and ask the user politely to change 
> the config to meet this conidtion. Of course we will change the documentation 
> for dfs.block.size also.

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