[SERVER-72280] Named Pipes: Remove $lookup tests Created: 20/Dec/22  Updated: 29/Oct/23  Resolved: 20/Dec/22

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: 6.3.0-rc0

Type: Task Priority: Major - P3
Reporter: Kevin Cherkauer Assignee: Kevin Cherkauer
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Depends
Backwards Compatibility: Fully Compatible
Participants:
Linked BF Score: 35

 Description   

$lookup is not supported with named pipes as the Classic execution engine uses nested-loop join, so may need to read the inner "table" more than once (if it does not get cached), but named pipes are read-once, so an attempt to re-read a pipe may fail or hang causing a timeout.

Agreement in the team scrum today is we will remove $lookup tests both from FSM and noPassthrough and will open another Jira ticket to add guardrails preventing $lookup from being used with named pipes.

This ticket is to remove the $lookup tests from the external_data_source.js tests in

  • mongo/jstests/noPassthrough/
  • mongo/jstests/concurrency/fsm_workloads_no_passthrough_with_mongod/

This will fix BF-27211 (and its duplicate BF-27210).



 Comments   
Comment by Githook User [ 20/Dec/22 ]

Author:

{'name': 'Kevin Cherkauer', 'email': 'kevin.cherkauer@mongodb.com', 'username': 'kevin-cherkauer'}

Message: SERVER-72280 Named Pipes: Remove $lookup tests
Branch: master
https://github.com/mongodb/mongo/commit/aa841fd244431e841b47232ad9deb668704cc402

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