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https://issues.apache.org/jira/browse/HDFS-9411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15050090#comment-15050090
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Vinayakumar B commented on HDFS-9411:
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Thanks [~zhz] for taking look here.
bq. 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.
These are mandatory for files which have zones. Yes we need to consider those
cases.
I have plan to update the design in sometime. That will have these cases
handled.
> 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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