[SERVER-80107] Failovers can break time-series creation Created: 15/Aug/23  Updated: 22/Sep/23  Resolved: 22/Sep/23

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

Type: Bug Priority: Major - P3
Reporter: Felipe Gasper Assignee: Gregory Noma
Resolution: Duplicate Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Duplicate
duplicates SERVER-76547 Create command on a time-series colle... Closed
Related
Assigned Teams:
Storage Execution NAMER
Operating System: ALL
Steps To Reproduce:

Unfortunately this isn’t easy to reproduce; it seems to have happened as a result of precise timing of the failover during the time-series collection’s creation.

Sprint: Execution NAMR Team 2023-10-02
Participants:

 Description   

In a recent test run against REP-2771’s development branch for time-series support, I saw this error:

(NamespaceExists) namespace test.timeseries_insert already exists, but is a view on test.system.buckets.timeseries_insert rather than test.

The verbiage seems a bit frustrated, and there really shouldn’t be actual namespace conflicts at that point in a mongosync CI run since each namespace gets exactly 1 `create`, and nothing else alters the destination cluster at that time.

It looks like what happened was that an election happened midway through creation of a time-series collection (via the public API, not creating buckets+view directly), and maybe that confused things afterward.

One potential workaround is for mongosync to create the buckets & view separately; I haven’t yet investigated that change to see if it’ll work.



 Comments   
Comment by Felipe Gasper [ 22/Sep/23 ]

gregory.noma@mongodb.com I’ve switched my mongosync branch to create buckets & view separately. So while this issue relates to REP-2771, it’s not blocking for us.

Comment by Gregory Noma [ 18/Aug/23 ]

May be related to (or the same as) SERVER-76547

Generated at Thu Feb 08 06:42:42 UTC 2024 using Jira 9.7.1#970001-sha1:2222b88b221c4928ef0de3161136cc90c8356a66.