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https://issues.apache.org/jira/browse/HBASE-15316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15284252#comment-15284252
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Heng Chen commented on HBASE-15316:
-----------------------------------
Do you mean:
* When read block, we add one option in CacheConfig to cache ROOT_INDEX only.
(Currently, we will cache all index type block)
* When write block, we cache ROOT_INDEX by default
[~eclark]
> Add the ability to cache ROOT_INDEX on reads only
> -------------------------------------------------
>
> Key: HBASE-15316
> URL: https://issues.apache.org/jira/browse/HBASE-15316
> Project: HBase
> Issue Type: Bug
> Reporter: Elliott Clark
>
> For larger data sets it's sometimes not needed to fit the entire index in
> memory ( there can be cold spots in the data, too much data in index, etc).
> However it's almost always needed to cache the root index. It's always the
> hottest blocks of the entire region.
> We should allow the root index block to be cached in memory on write. We
> should also do that by default.
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