[IMPALA-9987] Improve logging around HTTP connections

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 4.0.0
• Fix Version/s: Impala 4.0.0
• Component/s: Backend
• Epic Color: ghx-label-13
• Assignee: Thomas Tauber-Marshall
• Reporter: Thomas Tauber-Marshall
• Created: 21/Jul/20 20:17
• Updated: 25/Jul/20 18:24
• Resolved: 24/Jul/20 21:41

Description

The existing logging around HTTP connections is poor. Some improvements that could be made:

• There are several messages that are logged on every connection creation and disconnect, sometimes resulting in large amounts of un-informative log spam. These could be moved to a higher vlog level.
• More vlog-ing in general could be added to help in debugging issues.
• The frequent "auth failed" message that gets logged in the not-actually-an-error situation that a client doesn't send an auth header on its first connection attempt until it sees the WWW-Authenticate can be misleading.