[IMPALA-7239] Mitigate ParseSmaps() overhead

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: Impala 2.10.0, Impala 2.11.0, Impala 3.0, Impala 2.12.0
• Fix Version/s: Impala 2.13.0, Impala 3.1.0
• Component/s: Backend
• Labels: perf resource-management
• Target Version: Impala 3.1.0
• Epic Color: ghx-label-5
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 03/Jul/18 00:05
• Updated: 06/Jul/20 15:45
• Resolved: 11/Jul/18 22:54

Description

I've heard anecdotes of high system time spent in functions related this the smap parsing. It appears that this can be expensive on systems once the impalad virtual memory gets fragmented and there are 10s of thousands of maps.

We can try to mitigate by reducing frequency of the parsing or disabling it entirely. I'm not sure if there are cheaper ways to get all of the same metrics.

Issue Links

• is related to: IMPALA-9919 Bad Impala Performance after a period of time