-
Type:
Bug
-
Resolution: Duplicate
-
Priority:
Major - P3
-
None
-
Affects Version/s: None
-
Component/s: None
-
None
-
ALL
Would like to report an incident which happened on MongoDB 4.4.8 running on Atlas.
We have a large table "reservations" and we did an $in query on the "customer_ids" field for roughly 240 values.
The table has the following indexes available:
- customer_ids: 1, shop_id: 1, deleted_at: 1
- customer_ids: 1
Looking at the log below, for some reason, the QueryPlanner selected an index which did not include customer_ids at all (deleted_at: 1, shop_id: 1, st: 1). This caused a full table scan and apparently locked our database from getting replication updates.
To resolve the issue on our end, I will add an index for (customer_ids: 1, deleted_at: 1). However, given this situation (an "any" with 240 ID keys) I still feel the QueryPlanner should have given preference to the customer_ids field. Please let me know your thoughts.
Full query is below:
{
"type": "command",
"ns": "XXX_production.reservations",
"appName": "XXX-worker-5-ap-northeast-1-production-6454d4c9b7-24x62",
"command": {
"getMore": {
"$numberLong": "8607675802982378262"
},
"collection": "reservations",
"$db": "XXX_production",
"$clusterTime": {
"clusterTime": {
"$timestamp": {
"t": 1628771231,
"i": 37
}
},
"signature": {
"hash": {
"$binary": "cV4XqTMxUfDx6OhwuVf2ombd7VM=",
"$type": "00"
},
"keyId": {
"$numberLong": "6952549997699137540"
}
}
},
"lsid": {
"id": {
"$uuid": "e5a5aabb-3b9e-4e74-b627-5f0545c5bc8c"
}
}
},
"originatingCommand": {
"find": "reservations",
"filter": {
"deleted_at": null,
"customer_ids": {
"$in": [
{
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},
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},
{
"$oid": "5c50283dcf1cae84900003c9"
},
{
"$oid": "5c502b2007eb5b9443001665"
},
{
"$oid": "5c5036941387255e320008bb"
},
{
"$oid": "5c50530d40b70f6406002668"
},
{
"$oid": "5c510f070ee382c4ee000490"
},
{
"$oid": "5c510efb40b70fdf9c001070"
},
{
"$oid": "5c5165734406a5585a001c54"
},
{
"$oid": "5c516c364406a5586f002274"
},
{
"$oid": "5c517e08c421ec5973000177"
},
{
"$oid": "5c517e7a0172675bfc0001bc"
},
{
"$oid": "5c517dc307eb5b2657000e7f"
}
]
}
}
},
"planSummary": "IXSCAN \{ deleted_at: 1, shop_id: 1, st: 1 }, IXSCAN \{ deleted_at: 1, shop_id: 1, st: 1 }",
"cursorid": {
"$numberLong": "8607675802982378262"
},
"keysExamined": 23229740,
"docsExamined": 23229740,
"fromMultiPlanner": true,
"numYields": 433327,
"nreturned": 12478,
"reslen": 16776510,
"locks": {
"ReplicationStateTransition": {
"acquireCount": {
"w": 433328
}
},
"Global": {
"acquireCount": {
"r": 433328
}
},
"Database": {
"acquireCount": {
"r": 433328
}
},
"Collection": {
"acquireCount": {
"r": 433328
}
},
"Mutex": {
"acquireCount": {
"r": 1
}
}
},
"storage": {
"data": {
"bytesRead": {
"$numberLong": "543712288884"
},
"bytesWritten": 8159393,
"timeReadingMicros": {
"$numberLong": "2303346467"
},
"timeWritingMicros": 12094801
},
"timeWaitingMicros": {
"cache": 32903002
}
},
"protocol": "op_msg",
"durationMillis": 5104820,
"v": "4.4.8"
}
Edited by MongoDB for formatting purposes
- duplicates
-
SERVER-21697 Plan ranking should take query and index keys into consideration for breaking ties
-
- Closed
-