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  1. Core Server
  2. SERVER-26213

Remove MigrationManager::CollectionMigrationsState::distLockHandle variable or remove MigrationManager's constant value distlock lockSessionID

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Details

    • Task
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 3.5.3
    • Sharding
    • None
    • Fully Compatible
    • Sharding 2017-01-02, Sharding 2017-02-13

    Description

      Since the MigrationManager is using a constant value as a lock session id, which is what DistLockHandle is, there is no longer a need for MigrationManager::CollectionMigrationsState to store this value. DistLockHandle will always be equal to MigrationManager::_lockSessionID for every balancer instance.

      Remove the MigrationManager::CollectionMigrationsState struct's distLockHandle variable, and clean up the MigrationManager code a bit because it no longer needs to handle it.

      OR: ------------

      Get rid of the constant lockSessionID value per balancer instance. This commit is then revertible. This would probably involve creating the MigrationManager::CollectionMigrationState objects in MigrationManager::startRecoveryAndAcquireDistLocks

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              dianna.hohensee@mongodb.com Dianna Hohensee
              dianna.hohensee@mongodb.com Dianna Hohensee
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