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From "Heng Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15316) Add the ability to cache ROOT_INDEX on reads only
Date Mon, 16 May 2016 08:07:13 GMT

    [ 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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