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https://issues.apache.org/jira/browse/HDFS-9411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15049509#comment-15049509
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Zhe Zhang commented on HDFS-9411:
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Thanks for the interesting proposal Vinay.
Are the file/dir => zone assignments treated as hints or are they mandatory? If
mandatory, we need to consider the scenarios where zones run out of space.
[~mark] I'm a little confused by your comments above. It looks like a reply to
some message that's not shown here.
> HDFS ZoneLabel 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: 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.
> ZONE_LABELS can logically divide the cluster datanodes into multiple Zones.
> High level design doc to follow soon.
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