[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 |
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| 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: |
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| Backwards Compatibility: | Fully Compatible | ||||||||
| Operating System: | ALL | ||||||||
| Sprint: | Sharding 2016-10-31 | ||||||||
| Participants: | |||||||||
| Case: | (copied to CRM) | ||||||||
| Description |
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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 ] |
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Author: {u'username': u'kaloianm', u'name': u'Kaloian Manassiev', u'email': u'kaloian.manassiev@mongodb.com'}Message: |