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https://issues.apache.org/jira/browse/HBASE-18708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16144775#comment-16144775
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Anoop Sam John commented on HBASE-18708:
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For 2.0 whether we need the on heap mode of Bucket Cache really? Why should
one use this? Why not L1 LRU cache then which is any way on heap. Considering
the off heap mode improvement, I was thinking to propose the removal of on heap
mode of BC.
> Configure on-heap bucketCache size using percentage of heap size
> ----------------------------------------------------------------
>
> Key: HBASE-18708
> URL: https://issues.apache.org/jira/browse/HBASE-18708
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: Biju Nair
> Assignee: Biju Nair
> Priority: Trivial
>
> Currently heap allocations for RS memory structures like {{memstore}} and
> {{lruCache}} are configured as percentage of total RS heap size. Since
> on-heap bucketCache uses RS heap, configuring it as a percentage of heap size
> will improve usability. Currently this can be configured either as a
> percentage of heap or a memory size in MiB and we can remove the latter
> option which is applicable to external or off-heap bucketCache.
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