[IMPALA-9989] Improve admission control pool stats logging

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 4.0.0
• Epic Color: ghx-label-9
• Assignee: Qifan Chen
• Reporter: Vincent Tran
• Created: 21/Jul/20 23:04
• Updated: 01/Sep/20 22:52
• Resolved: 31/Aug/20 15:16

Description

Information that should be explicit to log consumers:
1) Global pool stats at the time of admission. The stats from 'admission-controller.cc:515' only aggregate from queries admitted by this host.
2) Local host's memory - since it is also a factor in the admission decision.
3) Any other info that would factor into the admission decision.

Issue Links

• causes: IMPALA-10124 admission-controller-test fails with no such file or directory error
• causes: IMPALA-10129 Data race in MemTracker::GetTopNQueriesAndUpdatePoolStats