[IMPALA-8733] Add "bytes in core" metric for data cache

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Impala 3.3.0
• Component/s: Backend
• Labels: observability
• Epic Color: ghx-label-7
• Assignee: Unassigned
• Reporter: David Rorke
• Created: 02/Jul/19 01:01
• Updated: 02/Jul/19 18:08

Description

The remote-read data cache is a major consumer of physical memory.

It would be useful to have a "bytes in core" metric for the cache that reports the current in core physical size of the Linux page cache memory for the data cache.   This is useful for tuning data cache size or analyzing the impact of the data cache on host memory use and memory pressure.