Operational Defect Database
BugZero found this defect 20 days ago.
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MongoDB | 2657016
chooseRandomMigration can starve draining shards of available desitnation shard
Last update date:
4/29/2024
Affected products:
MongoDB Server
Affected releases:
No affected releases provided.
Fixed releases:
No fixed releases provided.
Description:
Info
Balancer iterates over the list of collections, then picks up candidate chunks to migrage. Everytime a shard is chosen, it gets removed from the list of eligible chunks for this round. So, if the collection that has a chunk that needs to be drained off a shard ends up being iterated last from the list of collections every time, it will never get a chance to get drained, especially in a cluster with small number of shards.
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