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https://issues.apache.org/jira/browse/HDFS-3689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418712#comment-13418712
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Suresh Srinivas commented on HDFS-3689:
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Some of the use cases include - support for more flexible concat operations
than the highly restricted concat operation currently supported in HDFS. This
helps data loading, merging small files into a large file etc. Variable length
block also enables ability to stop writing to the current block and start
writing to a new block at arbitrary boundaries instead of fixed block size
lengths, which could simplify handling errors in some cases.
> 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: data-node, hdfs client, name-node
> Affects Versions: 3.0.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
>
> 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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