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https://issues.apache.org/jira/browse/IMPALA-7219?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong reassigned IMPALA-7219:
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Assignee: (was: Misha Dmitriev)
> 7.5% of Catalog Server heap wasted by empty HashMaps and ArrayLists
> -------------------------------------------------------------------
>
> Key: IMPALA-7219
> URL: https://issues.apache.org/jira/browse/IMPALA-7219
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Misha Dmitriev
> Priority: Major
> Attachments: bad-colls-screenshot.png
>
>
> I recently analyzed a ~16GB heap dump of Catalog Server with jxray
> ([www.jxray.com).|http://www.jxray.com)./] It turns out that 7.5% of the heap
> is wasted by empty HashMap and ArrayList instances.
> !bad-colls-screenshot.png|width=464,height=531!
> These objects come from just four data fields in two classes:
> {{IncompleteTable}} and {{StructType}}. It should be easy to get rid of the
> overhead of these objects by initializing them lazily.
>
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