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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12986) Compaction pressure based client pushback
Date Sat, 07 Feb 2015 20:35:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14310920#comment-14310920
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Andrew Purtell commented on HBASE-12986:
----------------------------------------

We might also want to leave the current ExponentialClientBackoffPolicy as is and introduce
a new version of it that decouples the response to load factors from contributions of load
factor terms to the equation. In other words, make the collection of load factors pluggable,
define how the load factor plugins should contribute terms to the backoff calculation equation,
and have the policy implement only the backoff calculation equation. We can break out load
factor plugins for:
- Memstore load
- Heap occupancy (HBASE-12731)
- System load (HBASE-12217)
- Compaction pressure (this JIRA)

Or we could leave it up to the policy implementations to remain up to date with all of the
various server load feedbacks. The above suggestion is flexible but could make it complicated
to manage. Easier to specify a single policy class then a policy class plus multiple load
factor plugin classes.

Thoughts? 

[~jesse_yates] [~lhofhansl] 

> Compaction pressure based client pushback
> -----------------------------------------
>
>                 Key: HBASE-12986
>                 URL: https://issues.apache.org/jira/browse/HBASE-12986
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>
> HBASE-8329 recently introduced on all branches {{double RegionServerServices#getCompactionPressure()}},
which returns a value greater than or equal to 0.0, and any value greater than 1.0 means we
have exceeded the store file limit on some stores. It could be reasonable to send this value
along in server load statistics (clamping max at 1.0), and consider it as an additional term
in the ExponentialClientBackoffPolicy.



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