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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9411) HDFS NodeLabel support
Date Thu, 09 Mar 2017 12:16:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15902964#comment-15902964
] 

Rakesh R commented on HDFS-9411:
--------------------------------

bq. But the block re replication wont consider/honor this favored nodes ?
[~anoop.hbase], With the favored nodes, block will be pinned at the datanodes to prevent mover/balancer
tool operations. Since the favored nodes information is not persisted in HDFS(Namenode), during
replication these blocks will be re-replicated to new datanodes. I hope the following link,
[javadoc DistributedFileSystem#create function with favored nodes|https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java#L390]
will give you better clarity about the current behaviors.


> 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-15-09-2016.pdf, 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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