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https://issues.apache.org/jira/browse/HBASE-16046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16069519#comment-16069519
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stack commented on HBASE-16046:
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See this issue of Mikhails which asks for same thing.
> [UMBRELLA] Make our default rpc scheduler the adaptive LIFO+CoDel added in
> HBASE-15136
> --------------------------------------------------------------------------------------
>
> Key: HBASE-16046
> URL: https://issues.apache.org/jira/browse/HBASE-16046
> Project: HBase
> Issue Type: Task
> Components: rpc
> Reporter: stack
> Priority: Critical
> Fix For: 2.0.0
>
>
> Our current rpc scheduler default is FIFO. Good for speed but as soon as the
> server gets overloaded, our behavior goes south. We can do better, or a plan
> is better than none. Our FB brothers and sisters added an rpc scheduler that
> is smarter around overloading over in HBASE-15136. The implementation is the
> codification of FIFO when all is dandy flipping to LIFO with CoDel and load
> shedding when under duress. The algorithm is used elsewhere at FB w/ a nice
> writeup on why it 'works' and why. Makes sense to me. Has nice feature that
> tuning knobs are few and we should be able to nail defaults easy enough that
> will work for majority of cases. Lets adopt it as our default going forward.
> This is an umbrella issue for enabling it in 2.0.0. We need to do a few
> things as subissues. The mighty [~mantonov] and crew want to get some
> production experience first w/ their particular implementation -- makes sense
> -- and we need to add the speedup from HBASE-16023 (currently the codel
> scheduler is much slower than our default). Another consideration for here or
> as a follow on is the suggestion that when all is running smooth, let the
> Reader thread run the request rather than do handoff to handler (From
> [~ikeda] over on HBASE-14479)
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