Zach York updated HBASE-18533:
    Release Note: 
This patch exposes configuration for Bucketcache. These configs are very 
similar to those for the LRU cache, but are described below:

"hbase.bucketcache.single.percentage"; /** Single access bucket size */
"hbase.bucketcache.multi.percentage"; /** Multiple access bucket size */
"hbase.bucketcache.memory.percentage"; /** In-memory bucket size */
"hbase.bucketcache.extrafreefactor"; /** Free this floating point factor of 
extra blocks when evicting. For example free the number of blocks requested * 
(1 + extraFreeFactor) */
"hbase.bucketcache.acceptfactor"; /** Acceptable size of cache (no evictions if 
size < acceptable) */
"hbase.bucketcache.minfactor"; /** Minimum threshold of cache (when evicting, 
evict until size < min) */

> Expose BucketCache values to be configured
> ------------------------------------------
>                 Key: HBASE-18533
>                 URL: https://issues.apache.org/jira/browse/HBASE-18533
>             Project: HBase
>          Issue Type: Improvement
>          Components: BucketCache
>            Reporter: Zach York
>            Assignee: Zach York
>         Attachments: HBASE-18533.branch-1.001.patch, 
> HBASE-18533.branch-1.002.patch, HBASE-18533.master.001.patch, 
> HBASE-18533.master.002.patch
> BucketCache always uses the default values for all cache configuration. 
> However, this doesn't work for all use cases. In particular, users want to be 
> able to configure the percentage of the cache that is single access, multi 
> access, and in-memory access.

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