stack updated HBASE-18300:
    Fix Version/s:     (was: 2.0.0-alpha-2)

> Implement a Multi TieredBucketCache
> -----------------------------------
>                 Key: HBASE-18300
>                 URL: https://issues.apache.org/jira/browse/HBASE-18300
>             Project: HBase
>          Issue Type: New Feature
>          Components: BucketCache
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0
> We did an internal brainstorming to study the feasibility of this. Some of 
> our recent tests on SSDs like Optane shows that they are vastly faster in 
> randomreads and can act as effective caches. 
> In the current state we have a single tier of Bucket cache and the bucket 
> cache can either be offheap or configured to work with file mode. (The file 
> mode can have multiple files backing it).
> So this model restricts us from using either the memory or the file and not 
> both. 
> With the advent of faster devices like Optane SSDs, NVMe based devices it is 
> better we try to utilize all those devices and try using them for the bucket 
> cache so that we can avoid the impact of slower devices where the actual data 
> resides on the HDFS data nodes. 
> Combined with this we can allow the user to configure the caching layer per 
> family/table so that one can effectively make use of the caching tiers.
> Can upload a design doc here. Before that, would like to know the suggestions 
> here. Thoughts!!!

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