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https://issues.apache.org/jira/browse/IMPALA-13486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17950627#comment-17950627
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Quanlong Huang commented on IMPALA-13486:
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Created a separate Jira for MemPool improvement to tackle the TCMalloc
contention issue: IMPALA-14064
> Improve memory estimation and allocation for queries on complex types
> ---------------------------------------------------------------------
>
> Key: IMPALA-13486
> URL: https://issues.apache.org/jira/browse/IMPALA-13486
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Manish Maheshwari
> Priority: Critical
>
> Improve memory estimation and allocation for queries on complex types taking
> into account the number of values in the complex type and any functions like
> unnest that would consume a lot of memory.
> Currently underestimating memory causes a lot of tcmalloc calls and the query
> get blocked waiting for tcmalloc central freelist.
>
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