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Author:
{'name': 'Max Hirschhorn', 'email': 'max.hirschhorn@mongodb.com', 'username': 'visemet'}
Message: SERVER-52690 Run ReshardingCollectionCloner on a TaskExecutor.
Restructures the ReshardingCollectionCloner class to run on a separate
thread and returned a mongo::Future readied when the cloning procedure
has completed successfully or failed with an error.
Also enables the ReshardingCollectionCloner to insert documents in
batches of size > 1 in a single storage transaction. The
reshardingCollectionClonerBatchSizeInBytes server parameter can be used
to control the size of the insert batch.
Branch: master
https://github.com/mongodb/mongo/commit/4e4ebb8fef276c28011aebecf8a0ed12e69a9f9b
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