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Type:
Bug
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: Import/Export
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None
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Environment:OS:
node.js / npm versions:
Additional info: MongoDB 6,05 and compass 1.36.1
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Iteration Yellowtail Amberjack, Iteration Zebrafish
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Not Needed
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None
Description
Time series collection count operation executes long running expensive operation(s). This is an issue for customers with high volume of data in time series collecitons. A simple selection of the collection in compass results in 2 long running expensive collection scans that impact the cluster performance and have to be stopped manually.
Expected Results
Single efficient scan with expiration time.
Actual Results
Two expensive collection scans. Example from local reproduction with MongoDB 6,05 and compass 1.36.1
Additional Notes
Example logs:
{"t":{"$date":"2023-03-22T16:24:53.041+02:00"},"s":"I", "c":"COMMAND", "id":51803, "ctx":"conn166","msg":"Slow query","attr":{"type":"command","ns":"test.TS collection","appName":"MongoDB Compass","command":{"aggregate":"TS collection","pipeline":[{"$match":{}},{"$count":"count"}],"cursor":{},"maxTimeMS":5000,"lsid":{"id":{"$uuid":"1c550366-94c4-461c-b11d-4fdab96a2c61"}},"$clusterTime":{"clusterTime":{"$timestamp":{"t":1679495075,"i":1}},"signature":{"hash":{"$binary":{"base64":"AAAAAAAAAAAAAAAAAAAAAAAAAAA=","subType":"0"}},"keyId":0}},"$db":"test"},"planSummary":"COLLSCAN","resolvedViews":[{"viewNamespace":"test.TS collection","dependencyChain":["TS collection","system.buckets.TS collection"],"resolvedPipeline":[{"$_internalUnpackBucket":{"timeField":"ts_time_field","metaField":"date_rolled","bucketMaxSpanSeconds":86400}}]}],"keysExamined":0,"docsExamined":99958,"cursorExhausted":true,"numYields":103,"nreturned":1,"queryHash":"17830885","queryFramework":"classic","reslen":251,"locks":{"FeatureCompatibilityVersion":{"acquireCount":{"r":229}},"Global":{"acquireCount":{"r":229}},"Mutex":{"acquireCount":{"r":126}}},"readConcern":{"level":"local","provenance":"implicitDefault"},"writeConcern":{"w":"majority","wtimeout":0,"provenance":"implicitDefault"},"storage":{},"remote":"127.0.0.1:53122","protocol":"op_msg","durationMillis":789}}
{"t":{"$date":"2023-03-22T16:24:53.043+02:00"},"s":"I", "c":"COMMAND", "id":51803, "ctx":"conn99","msg":"Slow query","attr":{"type":"command","ns":"test.TS collection","appName":"MongoDB Compass","command":{"count":"TS collection","lsid":{"id":{"$uuid":"282cbf44-e4b9-47fd-bf1e-052e1aa36960"}},"$clusterTime":{"clusterTime":{"$timestamp":{"t":1679495075,"i":1}},"signature":{"hash":{"$binary":{"base64":"AAAAAAAAAAAAAAAAAAAAAAAAAAA=","subType":"0"}},"keyId":0}},"$db":"test"},"planSummary":"COLLSCAN","resolvedViews":[{"viewNamespace":"test.TS collection","dependencyChain":["TS collection","system.buckets.TS collection"],"resolvedPipeline":[{"$_internalUnpackBucket":{"timeField":"ts_time_field","metaField":"date_rolled","bucketMaxSpanSeconds":86400}}]}],"keysExamined":0,"docsExamined":99958,"cursorExhausted":true,"numYields":104,"nreturned":1,"queryHash":"17830885","queryFramework":"classic","reslen":166,"locks":{"FeatureCompatibilityVersion":{"acquireCount":{"r":231}},"Global":{"acquireCount":{"r":231}},"Mutex":{"acquireCount":{"r":127}}},"readConcern":{"level":"local","provenance":"implicitDefault"},"storage":{},"remote":"127.0.0.1:52930","protocol":"op_msg","durationMillis":791}}
- is related to
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- Closed
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