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Date: Fri, 8 Aug 2014 23:18:13 +0000 (UTC)
From: "Doug Cutting (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12599539.1342734662278.47423.1407539893435@arcas>
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Subject: [jira] [Commented] (HDFS-3689) Add support for variable length
 block
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    [ https://issues.apache.org/jira/browse/HDFS-3689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14091434#comment-14091434 ] 

Doug Cutting commented on HDFS-3689:
------------------------------------

Many applications assume that blocks but the last are the same size, partitioning their work along block boundaries, e.g., FileInputFormat#getSplits.  Performance will likely suffer when using such applications on files with mixed-length blocks.

> 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
>
>
> 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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