[IMPALA-9181] Serialize TQueryCtx once per query

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 3.4.0
• Fix Version/s: Impala 3.4.0
• Component/s: Backend
• Epic Color: ghx-label-7
• Assignee: Thomas Tauber-Marshall
• Reporter: Thomas Tauber-Marshall
• Created: 21/Nov/19 19:47
• Updated: 25/Feb/20 17:11
• Resolved: 03/Dec/19 23:34

Description

When issuing Exec() rpcs to backends, we currently serialize the TQueryCtx once per backend. This is inefficient as the TQueryCtx is the same for all backends and really only needs to be serialized once.