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https://issues.apache.org/jira/browse/IMPALA-15316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joe McDonnell resolved IMPALA-15316.
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Fix Version/s: Impala 5.0.0
Resolution: Fixed
> Support huge pages when tcmalloc's aggressive decommit is off
> -------------------------------------------------------------
>
> Key: IMPALA-15316
> URL: https://issues.apache.org/jira/browse/IMPALA-15316
> Project: IMPALA
> Issue Type: Task
> Components: Backend
> Affects Versions: Impala 5.0.0
> Reporter: Joe McDonnell
> Assignee: Joe McDonnell
> Priority: Critical
> Fix For: Impala 5.0.0
>
>
> In IMPALA-14900, we added support for turning off TCMalloc's aggressive
> decommit mode. This came at the cost of disabling madvise_huge_pages for that
> configuration. Without aggressive decommit, TCMalloc could break up huge
> pages and reuse smaller chunks. This could make the memory usage deceptive.
> We can support huge pages with aggressive decommit off by mmap them ourselves
> in the SystemAllocator. We would need to track this memory usage and count it
> toward the process limit.
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