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https://issues.apache.org/jira/browse/HBASE-12731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14265510#comment-14265510
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Jesse Yates commented on HBASE-12731:
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Would be good to sample with greater frequency once the low-water mark is met,
and mostly definitely once we hit the high-water mark, in the interest of
availability.
> Heap occupancy based client pushback
> ------------------------------------
>
> Key: HBASE-12731
> URL: https://issues.apache.org/jira/browse/HBASE-12731
> Project: HBase
> Issue Type: New Feature
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
>
> If the heap occupancy of a RegionServer is beyond a configurable high water
> mark (suggestions: 95%, 98%) then we should reject all user RPCs and only
> allow administrative RPCs until occupancy has dropped below a configurable
> low water mark (suggestions: 92%).
> Implement building on the HBASE-5162 changes.
> It might be expensive to check heap occupancy, in which case we can sample it
> periodically with a chore and use the last known value in pushback
> calculations.
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