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https://issues.apache.org/jira/browse/HBASE-13170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14351883#comment-14351883
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Nick Dimiduk commented on HBASE-13170:
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Looking good [~eclark]. Repeating my comment from fabricator over here: 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.
I'd prefer to not add memcached companion process for the common case -- people
complain enough as it is about having HDFS + ZK as mandatory runtime
dependencies. This is a nice optional choice though.
> 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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