[IMPALA-5156] Drop VLOG level passed into Kudu client

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.8.0
• Fix Version/s: Impala 2.9.0
• Component/s: Backend, Perf Investigation
• Epic Color: ghx-label-2
• Assignee: Unassigned
• Reporter: Todd Lipcon
• Created: 04/Apr/17 01:58
• Updated: 09/Apr/17 18:44
• Resolved: 09/Apr/17 18:44

Description

I'm running a concurrent stress workload with lots of small queries. By changing the impalad vlog level from 1 to 0, my QPS went from ~17qps to around 60qps.

We should consider passing FLAGS_v - 1 into Kudu's vlog level, since we generally assume that VLOG=1 is allowed to be relatively noisy (eg logging thread start/stop, etc) whereas it seems like Impala's policy is that VLOG(1) should be fairly quiet.