[SERVER-56598] Sharding DDL coordinators block running thread during construction phase Created: 04/May/21  Updated: 06/Dec/22  Resolved: 28/Jun/21

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

Type: Bug Priority: Major - P3
Reporter: Tommaso Tocci Assignee: [DO NOT USE] Backlog - Sharding EMEA
Resolution: Duplicate Votes: 0
Labels: PM-1965-Cleanup
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Duplicate
duplicates SERVER-56600 Make DDL coordinators not wait for Di... Closed
Assigned Teams:
Sharding EMEA
Participants:

 Description   

Currently sharding DDL coordinators attempt to acquire dist-locks in their construction phase. This is blocking work that depends on other coordinators to complete. Since all the coordinators use the same shared threadpool we can end-up with the following deadlock on thread acquisition:

  • coordinator 1 waits on the dist-locks acquisition without yelding his threads (T1)
  • coordinator 2 waits on (T1) to be available in other to release the distlock.


 Comments   
Comment by Kaloian Manassiev [ 28/Jun/21 ]

Will be subsumed by the work of SERVER-56600.

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