[SERVER-58266] Stop forcing database version refreshes in chunk manager targeter Created: 05/Jul/21  Updated: 29/Oct/23  Resolved: 05/Jul/21

Status: Closed
Project: Core Server
Component/s: Sharding
Affects Version/s: 5.0.0-rc7
Fix Version/s: 5.0.2, 5.1.0-rc0

Type: Bug Priority: Major - P3
Reporter: Tommaso Tocci Assignee: Tommaso Tocci
Resolution: Fixed Votes: 0
Labels: sharding
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Backports
Related
related to SERVER-58271 Stop forcing collection version refre... Closed
Backwards Compatibility: Fully Compatible
Operating System: ALL
Backport Requested:
v5.0
Sprint: Sharding EMEA 2021-06-28
Participants:

 Description   

When we received a StaleDbVersion error during a batchWrite, in the ChunkManagerTargeter we locally decide if we need to refresh based on some version comparision and if this is the case we force a full refresh of the catalog cache.

If multiple cuncurrent batchWrite operations hit the same StaleDbVersion they will all force a full refresh of the catalog without any kind of syncronization, causing several refresh of the cached database metadata when actually only one is required.

When receiving a StaleDbVersion the ChunkManagerTargeter should only call CatalogCache::onStaleDbVersion() and expect that on the next CatalogCache lookup it will receive the refreshed metadata. In this new approach if we receive several staleDbVersion concurrently with the same db version we will only perform one refresh.



 Comments   
Comment by Vivian Ge (Inactive) [ 06/Oct/21 ]

Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it’s been triggered. For more active release information, please keep an eye on #server-release. Thank you!

Comment by Githook User [ 20/Jul/21 ]

Author:

{'name': 'Tommaso Tocci', 'email': 'tommaso.tocci@mongodb.com', 'username': 'toto-dev'}

Message: SERVER-58266 Stop forcing database version refreshes in chunk manager targeter

(cherry picked from commit daf6c4c0e7b136529e2a6152b062946f1c50217f)
Branch: v5.0
https://github.com/mongodb/mongo/commit/f417d1781fcd9aaf2030fc011395700c5ef4d37b

Comment by Githook User [ 05/Jul/21 ]

Author:

{'name': 'Tommaso Tocci', 'email': 'tommaso.tocci@mongodb.com', 'username': 'toto-dev'}

Message: SERVER-58266 Stop forcing database version refreshes in chunk manager targeter
Branch: master
https://github.com/mongodb/mongo/commit/daf6c4c0e7b136529e2a6152b062946f1c50217f

Comment by Tommaso Tocci [ 05/Jul/21 ]

Code Review: http://mongodbcr.appspot.com/797340001

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