Nick Dimiduk created PHOENIX-2859:
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Summary: RPC Heartbeats for aggregation coprocessors
Key: PHOENIX-2859
URL: https://issues.apache.org/jira/browse/PHOENIX-2859
Project: Phoenix
Issue Type: Improvement
Reporter: Nick Dimiduk
Phoenix supports a range of analytical functions, including {{count}}, {{sum}},
{{min}}, {{max}}, &c. Many of these are heavily supported by aggregation
coprocessors. When the Phoenix table contains any significant amount of data,
these aggregation functions can take a while. Mostly these queries will be
killed by phoenix query timeout or hbase rpc timeout. Both of these settings
must be increased in order to support these aggregation queries at all. This is
pretty annoying because there's two configs managing similar things.
We could better support these kinds of queries if our coprocessors supported a
heart-beat functionality, similar to what was added in for HBase scanners in
HBASE-13090. This lets us leave HBase's RPC timeout as the default and let
queries be managed by Phoenix's query timeout. That keeps the cluster snappy
and responsive for usual workloads, but still supports basic aggregations.
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