[IMPALA-10359] Eliminate blocking in rpc threads in AdmissionControlService

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Distributed Exec
• Epic Color: ghx-label-12
• Assignee: Unassigned
• Reporter: Thomas Tauber-Marshall
• Created: 26/Nov/20 00:18
• Updated: 22/Dec/20 19:16

Description

Currently, in AdmissionControlService::GetQueryStatus(), we block waiting for admission to complete for a configurable amount of time. Since this happens on an RPC thread, this is a potential scalability issue for larger clusters that might have lots of queries queued.