[IMPALA-5220] Clean up TCMalloc memory maintenance logic

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.9.0
• Fix Version/s: Impala 2.9.0
• Component/s: Backend
• Labels: resource-management
• Target Version: Impala 2.9.0
• Epic Color: ghx-label-3
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 17/Apr/17 22:58
• Updated: 11/May/17 15:26
• Resolved: 11/May/17 15:26

Description

As mentioned in IMPALA-2800, TCMalloc's default behaviour so that it does not keep unmapped memory around. This means that our various ReleaseMemory()/ReleaseToSystem() calls may not have any effect.

We should verify this and then remove any logic that is no longer needed.