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Date: Wed, 20 Aug 2014 07:02:27 +0000 (UTC)
From: "Jing Zhao (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12599539.1342734662278.294.1408518147710@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=14103523#comment-14103523 ] 

Jing Zhao commented on HDFS-3689:
---------------------------------

Thanks for the comments, [~cutting]! Do you think it is possible that we can locate and fix these applications? Or can a lower limit of the block length be helpful on the performance perspective? Basically I guess variable block length can also improve the performance and efficiency of a lot of applications. For example, Hive may save up to 40% of storage that is currently cost by padding. Thus it will be great if we can have this feature while still keep the existing applications working fine.

> 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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