[SERVER-24204] Balancer window to support days of the week Created: 18/May/16  Updated: 06/Dec/22  Resolved: 13/Jan/22

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

Type: Improvement Priority: Minor - P4
Reporter: Daniel Coupal Assignee: [DO NOT USE] Backlog - Sharding EMEA
Resolution: Won't Do Votes: 1
Labels: balancer
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Related
is related to SERVER-51890 Support multiple balancing windows wi... Closed
Assigned Teams:
Sharding EMEA
Participants:

 Description   

A customer had to restrict the balancer window to only 4 hours per day, when traffic is much lighter.
Chunk migrations keep falling behind due to the small balancing window.
The fix was to enable longer hours over the weekend, which also shows a much lighter traffic for that period.

Since the balancer schedule only supports hours, alternatives were:

  • manually change the schedule on Friday night and Sunday night
  • have a cron to make the changes to the schedule.

In this case, it would have been helpful to be able to specify the hours per day in the schedule.



 Comments   
Comment by Connie Chen [ 13/Jan/22 ]

This is a specific solution, we will be solving this by making the balancer not impactful. Work will be tracked as part of the PM-2142: Always-On Balancer projects

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