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https://issues.apache.org/jira/browse/HBASE-24289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17130377#comment-17130377
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Guanghao Zhang commented on HBASE-24289:
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{quote}Under the region/hstore there wont be any sub dirs?
{quote}
Yes. Only tmp dir has sub dir.
{quote}Suppose we change the compaction policy on an existing table to be Date 
tiered also vice versa, there wont be any issues right?
{quote}
Yes. Only tmp dir changed, I thought there are no problems.

> Heterogeneous Storage for Date Tiered Compaction
> ------------------------------------------------
>
>                 Key: HBASE-24289
>                 URL: https://issues.apache.org/jira/browse/HBASE-24289
>             Project: HBase
>          Issue Type: New Feature
>          Components: Compaction
>            Reporter: Mengqing Peng
>            Assignee: Mengqing Peng
>            Priority: Major
>
> Support DateTiredCompaction(HBASE-15181) for cold and hot data separation, 
> support different storage policies for different time periods of data to get 
> better performance, for example, we can configure the data of last 1 month in 
> SSD, and 1 month ago data was in HDD.
> design doc: 
> https://docs.google.com/document/d/1fk_EWLNnxniwt3gDjUS_apQ3cPzn90AmvDT1wkirvKE/edit?usp=sharing



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