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https://issues.apache.org/jira/browse/HBASE-5978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13281228#comment-13281228
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Alex Newman commented on HBASE-5978:
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I assume you want this to return before any exception is thrown?
> Scanner next() calls should return after a configurable time threshold
> regardless of number of accumulated rows
> ---------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-5978
> URL: https://issues.apache.org/jira/browse/HBASE-5978
> Project: HBase
> Issue Type: Improvement
> Components: client, regionserver
> Affects Versions: 0.90.7, 0.92.1
> Reporter: Todd Lipcon
>
> Currently if you pass a very restrictive filter to a scanner, along with a
> high caching value, you will end up causing RPC timeouts, lease exceptions,
> etc. Although this is a poor configuration and easy to work around by
> lowering caching, HBase should be resilient to a badly chosen caching value.
> As such, the scanner next() call should record the elapsed time, and after
> some number of seconds have passed, return any accumulated rows regardless of
> the caching value. This prevents the calls from starving out other threads or
> region operations.
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