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https://issues.apache.org/jira/browse/IMPALA-14493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18029902#comment-18029902
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Michael Smith commented on IMPALA-14493:
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What kind of things have led to excessive memory use in admissiond?
> Capping Memory Usage of Global Admission Service
> -------------------------------------------------
>
> Key: IMPALA-14493
> URL: https://issues.apache.org/jira/browse/IMPALA-14493
> Project: IMPALA
> Issue Type: Bug
> Reporter: Yida Wu
> Assignee: Yida Wu
> Priority: Major
>
> The admission service ({{{}admissiond{}}}) can OOM on high workload because
> its process memory tracker is inaccurate and doesn't account for all memory
> allocations.
> Ensuring memory tracker accurately accounts for every allocation could be
> difficult, one simpler solution is to introduce a hard memory cap using
> {{tcmalloc}} statistics, which accurately reflect the true process memory
> usage. If a new query is submitted while {{tcmalloc}} memory usage is over
> the process limit, the query will be rejected immediately to protect from OOM.
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