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https://issues.apache.org/jira/browse/PHOENIX-4266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17011484#comment-17011484
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Lars Hofhansl commented on PHOENIX-4266:
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The RoundRobinResultIterator uses the scanner caching value to schedule the
round robin scanning, we'd have to invent another value there - the
"roundrobinness" is independent of the caching anyway.
> Avoid scanner caching in Phoenix
> --------------------------------
>
> Key: PHOENIX-4266
> URL: https://issues.apache.org/jira/browse/PHOENIX-4266
> Project: Phoenix
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Priority: Major
> Fix For: 5.1.0, 4.16.0
>
>
> Phoenix tries to set caching on all scans. On HBase versions before 0.98 that
> made sense, now it is the wrong thing to do.
> HBase will by default do size based chunking. Setting scanner caching
> prevents HBase doing this work.
> We should avoid scanner everywhere, and only use in cases where we know the
> number of rows to be returned (and that number is small).
> [~sergey.soldatov], [~jamestaylor]
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