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https://issues.apache.org/jira/browse/HBASE-15316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15284911#comment-15284911
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Elliott Clark commented on HBASE-15316:
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bq.When write block, we cache ROOT_INDEX by default
I mean that we should have the ability to cache ROOT_INDEX on writing a HFile.
Right now we have the ability to cache all index blocks on write. However as
data gets big that can be a lot of data and might include very stale indices.
Root index however is read many many times and should be pretty small.
> 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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