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https://issues.apache.org/jira/browse/HBASE-28770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nick Dimiduk resolved HBASE-28770.
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Resolution: Fixed
> Support partial results in AggregateImplementation and AsyncAggregationClient
> -----------------------------------------------------------------------------
>
> Key: HBASE-28770
> URL: https://issues.apache.org/jira/browse/HBASE-28770
> Project: HBase
> Issue Type: Improvement
> Components: Client, Coprocessors, Quotas
> Affects Versions: 2.6.0
> Reporter: Charles Connell
> Assignee: Charles Connell
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.7.0, 3.0.0-beta-2, 2.6.1
>
>
> Currently there is a gap in the coverage of HBase's quota-based workload
> throttling. Requests sent by {{[Async]AggregationClient}} reach
> {{AggregateImplementation}}. This then executes Scans in a way that bypasses
> the quota system. We see issues with this at Hubspot where clusters suffer
> under this load and we don't have a good way to protect them.
> In this ticket I'm teaching {{AggregateImplementation}} to optionally stop
> scanning when a throttle is violated, and send back just the results it has
> accumulated so far. In addition, it will send back a row key to
> {{AsyncAggregationClient}}. When the client gets a response with a row key,
> it will sleep in order to satisfy the throttle, and then send a new request
> with a scan starting at that row key. This will have the effect of continuing
> the work where the last request stopped.
> This feature will be unconditionally enabled by {{AsyncAggregationClient}}
> once this ticket is finished. {{AggregateImplementation}} will not assume
> that clients support partial results, however, so it can keep supporting
> older clients. For clients that do not support partial results, throttles
> will not be respecting, and results will always be complete.
> This feature was [first proposed on the mailing
> list|https://lists.apache.org/thread/1vqnxb71z7swq2cogz4qg3cn6b10xp4v].
> Builds on work in HBASE-28346.
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