Michael Ho created IMPALA-8656:
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Summary: Support for eagerly fetching and spooling all query
result rows
Key: IMPALA-8656
URL: https://issues.apache.org/jira/browse/IMPALA-8656
Project: IMPALA
Issue Type: Improvement
Components: Backend
Affects Versions: Impala 3.2.0, Impala 2.12.0
Reporter: Michael Ho
Impala's current interaction with clients is pulled-based: it relies on clients
to fetch results to trigger the generation of more result row batches until all
the result rows have been produced. If a client issues a query without fetching
all the results, the query fragments will continue to consume the resources
until the query hits is cancelled and unregistered for whatever reasons. This
is undesirable as resources are held up by misbehaving clients and other
queries may wait for extended period of time in admission control due to this.
The high level idea for this JIRA is for Impala to have a mode in which result
sets of queries are eagerly fetched and spooled somewhere (preferably some
persistent storage). In this way, the cluster's resources are freed up once all
result rows have been fetched and stored in the spooling location. Incoming
client fetches can be returned from this spooled locations.
cc'ing [~stakiar], [~twm378], [~joemcdonnell], [~lv]
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