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https://issues.apache.org/jira/browse/HBASE-13170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14353618#comment-14353618
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Elliott Clark commented on HBASE-13170:
---------------------------------------

[~stack] No I don't think that this will be the default deployment for 
everyone. Sitting next to some of the people with direct knowledge of Memcached 
does make this a little easier to tolerate the added complexity.

bq.I've been thinking we should implement our multi-layer caching properly, 
supporting an arbitrary number of layers and with ability to specify how we 
want blocks to cascade from layer to layer.
[~ndimiduk] That would be really cool.

> Allow block cache to be external
> --------------------------------
>
>                 Key: HBASE-13170
>                 URL: https://issues.apache.org/jira/browse/HBASE-13170
>             Project: HBase
>          Issue Type: New Feature
>          Components: io
>    Affects Versions: 2.0.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>             Fix For: 1.1.0
>
>
> Allow an external service to provide the block cache. This has the nice 
> property of allowing failover/upgrades to happen without causing a fully cold 
> cache.
> Additionally this allows read replicas to share some of the same memory.



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