[IMPALA-8712] Convert ExecQueryFInstance() RPC to become asynchronous

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 3.3.0
• Fix Version/s: Impala 3.4.0
• Component/s: Distributed Exec
• Epic Color: ghx-label-1
• Assignee: Thomas Tauber-Marshall
• Reporter: Michael Ho
• Created: 26/Jun/19 17:17
• Updated: 25/Feb/20 17:12
• Resolved: 25/Feb/20 17:12

Description

Now that IMPALA-7467 is fixed, ExecQueryFInstance() can utilize the async RPC capabilities of KRPC instead of relying on the half-baked way of using ExecEnv::exec_rpc_thread_pool_ to start query fragment instances. We already have a reactor thread pool in KRPC to handle sending client RPCs asynchronously. Also various tasks under IMPALA-5486 can also benefit from making ExecQueryFInstance() asynchronous so the RPCs can be cancelled.