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https://issues.apache.org/jira/browse/HDFS-3689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14107148#comment-14107148
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Doug Cutting commented on HDFS-3689:
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bq. Right now these file formats need to accept "torn" records or add padding.

... or set the block size for the file to something large and start a new file 
whenever output approaches that, keeping each file in a single (big) block, 
guaranteeing that no records cross block boundaries.

> Add support for variable length block
> -------------------------------------
>
>                 Key: HDFS-3689
>                 URL: https://issues.apache.org/jira/browse/HDFS-3689
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode, hdfs-client, namenode
>    Affects Versions: 3.0.0
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>         Attachments: HDFS-3689.000.patch, HDFS-3689.001.patch
>
>
> Currently HDFS supports fixed length blocks. Supporting variable length block 
> will allow new use cases and features to be built on top of HDFS. 



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