In order to enable collection level locking for MMAPv1, the EM,
which is per-database, must handle concurrent read/write access
by operations on different collections.
- is depended on by
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SERVER-14674 Shard dies during chunk migration if running repairDatabase and Compact
- Closed
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SERVER-15633 ShardingState::doRefreshMetadata should take a more granular lock than exclusive db
- Closed