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https://issues.apache.org/jira/browse/HDFS-5682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13996072#comment-13996072
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Zesheng Wu commented on HDFS-5682:
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Thanks [~ndimiduk], here are some details of our SLA requirements:
The background is that we have a structured data storage system which is very
similar with amazon DynamoDB and is built on HBase. This system is intended to
serve multi-tenants, in order to ensure the SLA, such as 99% read/write
latency, we need to place the data on SSD. One straightforward way is to set up
a hdfs cluster with all SSD data disks, but this is cost too much. So we need
to reduce the cost. Another way is to set up a hdfs cluster with both SSD and
HDD data disks, we can put 1 replica on SSD, and the other 2 on HDD. This is
really a typical scenario of hdfs heterogeneous storage.
> Heterogeneous Storage phase 2 - APIs to expose Storage Types
> ------------------------------------------------------------
>
> Key: HDFS-5682
> URL: https://issues.apache.org/jira/browse/HDFS-5682
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
>
> Phase 1 (HDFS-2832) added support to present the DataNode as a collection of
> discrete storages of different types.
> This Jira is to track phase 2 of the Heterogeneous Storage work which
> involves exposing Storage Types to applications and adding Quota Management
> support for administrators.
> This phase will also include tools support for administrators/users.
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