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https://issues.apache.org/jira/browse/HBASE-11346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14032434#comment-14032434
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Nick Dimiduk commented on HBASE-11346:
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For a write-heavy application generating lots of small HFiles, this is true.
The idea is to reduce the impact of compactions on concurrent reads. There's
probably a threshold at which point it makes sense to keep this disabled.
> Enable cacheonwrite for index and bloom blocks by default
> ---------------------------------------------------------
>
> Key: HBASE-11346
> URL: https://issues.apache.org/jira/browse/HBASE-11346
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Affects Versions: 0.99.0, 0.98.4
> Reporter: Nick Dimiduk
>
> Theory is, this will reduce the cost of compactions on a mixed workload
> cluster, reducing the number of seeks for the first blocks from the new HFile
> from ~4 to ~1.
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