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https://issues.apache.org/jira/browse/HDFS-3689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14107176#comment-14107176
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Owen O'Malley commented on HDFS-3689:
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Since this is a discussion of what to put into trunk, incompatible changes
aren't a blocker. Furthermore, most clients would never see the difference.
Variable length blocks would dramatically improve the ability of HDFS to
support better file formats like ORC.
On the other hand, I've had very bad experiences with sparse files on Unix. It
is all too easy for a user to copy a sparse file and not understand that the
copy is 10x larger than the original. That would be *bad* and I do not think
that HDFS should support it at all.
> 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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