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https://issues.apache.org/jira/browse/HDFS-7584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14288467#comment-14288467
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Zhe Zhang commented on HDFS-7584:
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bq. If you have 1GB SSD quota dn 2GB DISK quota, which will limit your maximum
overall space usage at 3GB of space quota. You don't need to set legacy quota
in this case.
This makes sense. But what happens if the user did configure a legacy quota,
say 2GB in this case? Will it be enforced together with the 1GB SSD + 2GB DISK
quotas?
bq. The exchange rate actually could be a guideline for admin setup quotas of
different storage types. If automatic correlation for quota of different
storage types is desired, it should be explicitly set though policies.
Sounds good to me. We can revisit it as a follow up.
> Enable Quota Support for Storage Types (SSD)
> ---------------------------------------------
>
> Key: HDFS-7584
> URL: https://issues.apache.org/jira/browse/HDFS-7584
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, namenode
> Reporter: Xiaoyu Yao
> Assignee: Xiaoyu Yao
> Attachments: HDFS-7584 Quota by Storage Type - 01202015.pdf,
> HDFS-7584.0.patch, HDFS-7584.1.patch
>
>
> Phase II of the Heterogeneous storage features have completed by HDFS-6584.
> This JIRA is opened to enable Quota support of different storage types in
> terms of storage space usage. This is more important for certain storage
> types such as SSD as it is precious and more performant.
> As described in the design doc of HDFS-5682, we plan to add new
> quotaByStorageType command and new name node RPC protocol for it. The quota
> by storage type feature is applied to HDFS directory level similar to
> traditional HDFS space quota.
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