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  1. Core Server
  2. SERVER-8072

Migrations calculate majority incorrectly when waiting for writes to replicate

    • Type: Icon: Bug Bug
    • Resolution: Duplicate
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 2.2.2
    • Component/s: Replication, Sharding
    • None
    • ALL

      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.

            Assignee:
            Unassigned Unassigned
            Reporter:
            spencer@mongodb.com Spencer Brody (Inactive)
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              Created:
              Updated:
              Resolved: