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BugZero found this defect 138 days ago.
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MongoDB | 2535111
Allow $lookup to target an unsplittable collection on a primary shard within a multi-document transaction
Last update date:
3/15/2024
Affected products:
MongoDB Server
Affected releases:
No affected releases provided.
Fixed releases:
No fixed releases provided.
Description:
Info
As explained in SERVER-46373 currently $lookup is not allowed to target a sharded collection in a multi document transaction due to 2 known reasons: That a shard targeting itself will deadlock trying to re-acquire the same session That if a different shard needs to be targeted, the shard does not know how to correctly start the multi-doc txn on that other shard. After SERVER-81190 unsharded collection will be tracked and $lookup as a consequence won't be allowed on a unsharded collection as well (within a transaction) The goal of this ticket is to allow $lookup on an unsplittable collection if that collection is still on the primary. This is just a temporary fix before SERVER-46373 to enable SERVER-81190 to be merged and start tracking collections.
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