Details
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Task
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Resolution: Fixed
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Major - P3
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None
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None
Description
Description
Downstream Change Summary
Previously, an aggregation explain plan would sometimes not include serverInfo; this has been fixed.
Also, for a sharded explain plan, we previously only included the serverInfo for each shard. Now we also include the serverInfo for the mongos. (https://docs.mongodb.com/manual/reference/explain-results/index.html#serverinfo)
Description of Linked Ticket
Explain output for find commands include a serverInfo object that contains version information:
> db.foo.explain().find().finish().serverInfo
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{
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"host" : "MacBook-Pro.local",
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"port" : 27017,
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"version" : "4.1.4",
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"gitVersion" : "2f4b5918497b09a226a3ec5dcff930edd52ea1e9"
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}
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However, this information is not available for aggregation commands:
> db.foo.explain().aggregate([])
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{
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"stages" : [
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{
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"$cursor" : {
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"query" : {
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},
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"queryPlanner" : {
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"plannerVersion" : 1,
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"namespace" : "test.foo",
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"indexFilterSet" : false,
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"parsedQuery" : {
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},
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"queryHash" : "8B3D4AB8",
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"winningPlan" : {
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"stage" : "COLLSCAN",
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"direction" : "forward"
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},
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"rejectedPlans" : [ ]
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}
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}
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}
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],
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"ok" : 1
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}
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This would be helpful to include for more complete information when troubleshooting .
Scope of changes
Impact to Other Docs
MVP (Work and Date)
Resources (Scope or Design Docs, Invision, etc.)
Attachments
Issue Links
- documents
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SERVER-38691 serverInfo not present in explain output for aggregation
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- Closed
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