stack created HBASE-16046:
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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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