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The shards manage _______ migrations as a background operation between an origin shard and a destination shard.

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The shards manage _______ migrations as a background operation between an origin shard and a destination shard.

(a) cluster

(b) shard

(c) chunk

(d) all of the mentioned

This question was addressed to me in class test.

I need to ask this question from Cluster Architectures topic in portion Sharding Concepts, Mechanics and Sharded Cluster of MongoDB

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Right answer is (c) chunk

For explanation: During a chunk migration, the destination shard is sent all the current documents in the chunk from the origin shard.

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