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Type: Bug
Resolution: Duplicate
Priority: Major - P3
Fix Version/s: None
Affects Version/s: 4.4.0, 5.0.0-rc0
Component/s: None
Labels:
None

Operating System:
ALL
Sprint:
Query Optimization 2021-06-28
Confidence Status:
None
Work Order:
3

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name:
None
Goal Link:
None

As outlined in ~~SERVER-57483~~, the serialization code isn't appropriate as a mechanism to clone this stage. We should investigate a more robust way to distinguish the two use cases of serializing to the shards and serializing for being copied.

The impact of this problem is quite large. It means that your performance of a non-correlated $lookup might degrade when you move from a replica set to a sharded cluster.

duplicates

SERVER-57168 pipeline->clone() breaks on pipelines with union stage

Closed

is caused by

SERVER-45538 Implement and test shard version retry logic for $unionWith sub-pipeline

Closed

is related to

SERVER-57483 Results from $lookup stage are not cached for a resharding operation's sub-pipeline

Closed

SERVER-30399 Add caching for $lookup non-correlated sub-pipeline prefix

Closed

related to

SERVER-57168 pipeline->clone() breaks on pipelines with union stage

Closed

SERVER-57705 DocumentSourceSequentialCache can wind up in a suboptimal location due to optimizations

Backlog

SERVER-57668 Cache chunk bounds as an array in resharding collection cloning pipeline

Closed

(2 related to)

Assignee:: Ted Tuckman
Reporter:: Charlie Swanson
Participants:: Charlie Swanson, Ted Tuckman
Votes:: 0 Vote for this issue
Watchers:: 5 Start watching this issue

Created:: Jun 09 2021 04:25:48 PM UTC
Updated:: Jun 15 2021 01:58:11 PM UTC
Resolved:: Jun 15 2021 01:58:11 PM UTC
Confidence Status Last Update:: 14/Jun/21 1:31 PM

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