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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9411) HDFS NodeLabel support
Date Tue, 21 Jun 2016 09:23:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15341433#comment-15341433
] 

Kai Zheng commented on HDFS-9411:
---------------------------------

Hi Vinay,

Sometime ago I gave some comments about the first version of the design doc and am not sure
if they need to be addressed. It would be great if you could give your answers for me to understand
the whole. Would be happy to find some time to read your new revision. Thanks a lot.

> HDFS NodeLabel support
> ----------------------
>
>                 Key: HDFS-9411
>                 URL: https://issues.apache.org/jira/browse/HDFS-9411
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>         Attachments: HDFSNodeLabels-20-06-2016.pdf, HDFS_ZoneLabels-16112015.pdf
>
>
> HDFS currently stores data blocks on different datanodes chosen by BlockPlacement Policy.
These datanodes are random within the scope(local-rack/different-rack/nodegroup) of network
topology. 
> In Multi-tenant (Tenant can be user/service) scenario, blocks of any tenant can be on
any datanodes.
>  Based on applications of different tenant, sometimes datanode might get busy making
the other tenant's application to slow down. It would be better if admin's have a provision
to logically divide the cluster among multi-tenants.
> NodeLabels adds more options to user to specify constraints to select specific nodes
with specific requirements.
> High level design doc to follow soon.



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