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https://issues.apache.org/jira/browse/IMPALA-7351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16922963#comment-16922963
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Bikramjeet Vig commented on IMPALA-7351:
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[~stakiar] a zero reservation seems ok to me in that case. Like you mentioned,
no rows are actually buffered and also the result set returned is not owned by
the query. Ideally we would want to account for the result set memory but that
will be really tricky to attribute that memory to any logical entity
> Add memory estimates for plan nodes and sinks with missing estimates
> --------------------------------------------------------------------
>
> Key: IMPALA-7351
> URL: https://issues.apache.org/jira/browse/IMPALA-7351
> Project: IMPALA
> Issue Type: Sub-task
> Components: Frontend
> Reporter: Tim Armstrong
> Assignee: Bikramjeet Vig
> Priority: Major
> Labels: admission-control, resource-management
>
> Many plan nodes and sinks, e.g. KuduScanNode, KuduTableSink, ExchangeNode,
> etc are missing memory estimates entirely.
> We should add a basic estimate for all these cases based on experiments and
> data from real workloads. In some cases 0 may be the right estimate (e.g. for
> streaming nodes like SelectNode that just pass through data) but we should
> remove TODOs and document the reasoning in those cases.
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