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Type: Bug
Resolution: Fixed
Priority: Critical - P2
Fix Version/s: 5.0.0-rc2, 5.1.0-rc0
Affects Version/s: None
Component/s: None
Labels:

Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Backport Requested:

v5.0
Sprint:
Sharding 2021-06-14
Story Points:
1
Confidence Status:
None
Work Order:
0
CAR Domain/s:
None

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

DocumentSourceLookUp::buildPipeline() calls ShardServerProcessInterface::attachCursorSourceToPipeline() which calls sharded_agg_helpers::attachCursorToPipeline() and always serializes and re-parses, even when the pipeline may execute locally on the shard via ShardServerProcessInterface::attachCursorSourceToPipelineForLocalRead().

Because the $sequentialCache stage omits itself from the serialized pipeline, the parsed pipeline which executes locally on the shard won't ever use the cache.

is caused by

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

Closed

is related to

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

Closed

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

Closed

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

Closed

related to

SERVER-57579 DocumentSourceSequentialCache doesn't clone, ruining non-correlated $lookup pipeline caching in sharded deployments

Closed

SERVER-57667 Improve processing speed for resharding's collection cloning pipeline

Closed

(1 related to)

Assignee:: Max Hirschhorn
Reporter:: Max Hirschhorn
Participants:: Charlie Swanson, Githook User, Max Hirschhorn, Vivian Ge
Votes:: 0 Vote for this issue
Watchers:: 9 Start watching this issue

Created:: Jun 07 2021 03:11:30 AM UTC
Updated:: Oct 29 2023 09:52:33 PM UTC
Resolved:: Jun 10 2021 11:18:23 AM UTC