Bharath Vissapragada created HBASE-23649:
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Summary: Implement an adaptive hedging policy
Key: HBASE-23649
URL: https://issues.apache.org/jira/browse/HBASE-23649
Project: HBase
Issue Type: New Feature
Components: Client, rpc
Affects Versions: 3.0.0
Reporter: Bharath Vissapragada
Assignee: Bharath Vissapragada
HBASE-23305 implements a new rpc channel that can hedge requests to multiple
target end points. As [[email protected]] noted in the code review, it
makes more sense to have a pluggable hedging policy and make it adaptive based
on certain rpc performance/success metrics.
By default, the implementation hedges the requests across 'n' target addresses.
However in most cases, for smaller rpcs, the first 1 or 2 end points should
return the results pretty quickly and there is no point in hedging with a
bigger fan out as that only increases the load on the target servers. The idea
is to increase the fan out only when needed.
A naive way is to double the fan out at each attempt (starting from 1) until we
reach the configured max fan out. For example if the max fan out is 10, instead
of bursting to all 10 in each attempt, we fan out with values 1, 2, 4, 8, 10,
10, 10...
Any suggestions welcome.
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