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From "Jesse Yates (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12731) Heap occupancy based client pushback
Date Tue, 06 Jan 2015 01:33:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14265510#comment-14265510
] 

Jesse Yates commented on HBASE-12731:
-------------------------------------

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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