[SERVER-8072] Migrations calculate majority incorrectly when waiting for writes to replicate Created: 03/Jan/13 Updated: 06/May/13 Resolved: 03/Jan/13 |
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| Status: | Closed |
| Project: | Core Server |
| Component/s: | Replication, Sharding |
| Affects Version/s: | 2.2.2 |
| Fix Version/s: | None |
| Type: | Bug | Priority: | Major - P3 |
| Reporter: | Spencer Brody (Inactive) | Assignee: | Unassigned |
| Resolution: | Duplicate | Votes: | 0 |
| Labels: | None | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Issue Links: |
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| Operating System: | ALL | ||||||||
| Participants: | |||||||||
| Description |
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During migrations we wait for writes to be replicated to a majority of nodes. To figure out how many nodes are in a majority we call getSlaveCount() (and divide it by 2 and add 1). The number reported by getSlaveCount(), however, may include old nodes that are no longer part of the set (or are now known by a different identifier). This could potentially cause us to wait for more nodes than exist - meaning that we will never acknowledge the writes as replicated. |