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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-16046) [UMBRELLA] Make our default rpc scheduler the adaptive LIFO+CoDel added in HBASE-15136
Date Thu, 16 Jun 2016 17:49:05 GMT
stack created HBASE-16046:
-----------------------------

             Summary: [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 suboptimal. We can do better. Our FB brothers and sisters added over in
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'.
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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