[IMPALA-13063] HTTP requests on in-flight queries blocks query execution in coordinator side

• Type: Bug
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Component/s: Backend
• Epic Color: ghx-label-9
• Assignee: Unassigned
• Reporter: Quanlong Huang
• Created: 08/May/24 13:19
• Updated: 08/May/24 13:20

Description

This is a follow-up task for IMPALA-13034.

HTTP requests on in-flight queries usually acquire the lock of ClientRequestState. This could blocks client requests in fetching query results. E.g. there are several endpoints in WebUI that can dump a query profile: /query_profile, /query_profile_encoded, /query_profile_plain_text, /query_profile_json. If the profile is huge, such requests impact the query performance.

Fetching the details (profile, exec summary, etc.) of an in-flight query has lower priority and shouldn't block query execution.

Issue Links

• relates to: IMPALA-13034 Add logs for slow HTTP requests dumping the profile