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https://issues.apache.org/jira/browse/HBASE-15316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Heng Chen updated HBASE-15316:
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Attachment: HBASE-15316.patch
upload a patch as above understanding
> 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
> Attachments: HBASE-15316.patch
>
>
> 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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