Charles Connell created HBASE-29385:
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Summary: Very slow performance when using AsyncAggregationClient
for large scans
Key: HBASE-29385
URL: https://issues.apache.org/jira/browse/HBASE-29385
Project: HBase
Issue Type: Bug
Reporter: Charles Connell
Assignee: Charles Connell
In HBASE-28770 I introduced new code paths in {{AggregateImplementation}} that
are activated when the user uses {{AsyncAggregationClient}}. The goal of this
is to respect HBase's quotas when evaluating the user's request. I've been
testing this at a large scale. The current code checks for quotas exceeded once
for every call to {{ResultScanner#next()}}. This is not cheap and as a result,
calls to {{AggregateImplementation}} are tens or hundreds of times slower than
they otherwise would be. In this ticket I'll do this check less often.
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