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https://issues.apache.org/jira/browse/HDFS-9411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15020880#comment-15020880
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Vinayakumar B commented on HDFS-9411:
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bq. Hi Vinayakumar B, can you please clear the difference between ZoneLabel and
colocation in HDFS-9355?
HDFS-9355, indicates about storing different files from same client, in same
datanodes.
This Jira proposes for the partition of datanodes to multiple zones, which
might look like colocation if number of datanodes in a zone are nearly equal to
replication factor.
But, according to HDFS-9355, is entirely client-side changes.
> 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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