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https://issues.apache.org/jira/browse/HBASE-13170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14351873#comment-14351873
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Nick Dimiduk commented on HBASE-13170:
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You're right, only file ioengine supports this. Which is strange, because
persistence path must be specified separately, and the file path data is not
reused -- rewriting data from the cache path to the persistence path, not a
simple file copy... so why limit only to file ioengine?
> 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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