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  1. Core Server
  2. SERVER-62849

Drain recoverable RefineCollectionShardKeyCoordinators on FCV downgrade

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    • Task
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 5.3.0
    • Sharding
    • None
    • Fully Compatible
    • Sharding EMEA 2022-02-07
    • 164

    Description

      SERVER-62332 introduced a recoverable ShardingDDLCoordinator for RefineCollectionShardKey. This new coordinator will persist a state document. It is necessary to drain the new coordinators during FCV downgrade in order to ensure that an old binary won't find state documents about a DDL coordinator it doesn't support.

      Once this is done, we can also enable the feature flag that guards the new RefineCollectionShardKeyCoordinator.

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              jordi.serra-torrens@mongodb.com Jordi Serra Torrens
              jordi.serra-torrens@mongodb.com Jordi Serra Torrens
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