stack commented on HBASE-16408:

Will an on-heap bucketcache that does not make copies be faster than our 
lrublockcache? (Seems like it would be?)  I'd say we can forbid it though to 
keep things simple (and given we don't have much practice doing onheap bucket 
cache). mmap'd is considered file-based? Its not looked on as onheap?

> Handle On heap BucketCache size when HeapMemoryManager tunes memory
> -------------------------------------------------------------------
>                 Key: HBASE-16408
>                 URL: https://issues.apache.org/jira/browse/HBASE-16408
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 2.0.0

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