[SERVER-26770] Sharding balancer moves chunks from shards whose utilization is below the cluster average Created: 25/Oct/16  Updated: 31/Oct/16  Resolved: 27/Oct/16

Status: Closed
Project: Core Server
Component/s: Sharding
Affects Version/s: 3.4.0-rc1
Fix Version/s: 3.4.0-rc2

Type: Bug Priority: Major - P3
Reporter: Kaloian Manassiev Assignee: Kaloian Manassiev
Resolution: Done Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Related
related to SERVER-25652 Slow chunk migrations when there are ... Closed
Backwards Compatibility: Fully Compatible
Operating System: ALL
Sprint: Sharding 2016-10-31
Participants:
Case:

 Description   

The sharding balancer does not consult the optimal per shard chunk count when deciding to move chunks out of a shard and because of this causes chunks to move from shards with below-average number of entries to even less loaded shards, thus causing unnecessary churn.



 Comments   
Comment by Githook User [ 27/Oct/16 ]

Author:

{u'username': u'kaloianm', u'name': u'Kaloian Manassiev', u'email': u'kaloian.manassiev@mongodb.com'}

Message: SERVER-26770 Do not move chunks out of shards with below-average utilization
Branch: master
https://github.com/mongodb/mongo/commit/cc75cf210c63a0c96c74e01f3919938ea64a0317

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