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  1. Core Server
  2. SERVER-59337

Bad index selection when using $in

    • Type: Icon: Bug Bug
    • Resolution: Duplicate
    • Priority: Icon: Major - P3 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": {
              "$in": [
                {
                  "$oid": "5577e7c9342fc4dacf00049a"
                },
                {
                  "$oid": "5465aa078a9c91d514000010"
                },
                {
                  "$oid": "54cb29669ab0bb2a660009b4"
                },
                {
                  "$oid": "518404e870f78ebe160009c0"
                },
                {
                  "$oid": "518404e670f78ebe16000949"
                },
                {
                  "$oid": "518404e570f78ebe160008d7"
                },
                {
                  "$oid": "53c48fc19ab0bb8b1d000197"
                },
                {
                  "$oid": "518404e570f78ebe160008fb"
                },
                {
                  "$oid": "518404ea70f78ebe16000a46"
                },
                {
                  "$oid": "546d6a3e9ab0bb9b6e000fae"
                },
                {
                  "$oid": "546aa7cc342fc4b70800021c"
                },
                {
                  "$oid": "518404e670f78ebe16000917"
                },
                {
                  "$oid": "53e9896eb81b12ec84000085"
                },
                {
                  "$oid": "518404e570f78ebe160008e8"
                },
                {
                  "$oid": "551b94c9342fc400770004c5"
                },
                {
                  "$oid": "53ee0b0fa0749e863f0000f2"
                },
                {
                  "$oid": "548564fa342fc42db3000945"
                },
                {
                  "$oid": "518404e470f78ebe160008b1"
                },
                {
                  "$oid": "55b8e382a0749ef52b0012b6"
                },
                {
                  "$oid": "55cd58a76c0b62afcb0002f2"
                },
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                },
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                },
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                },
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                  "$oid": "5c123416b60bdd4d670024ec"
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                  "$oid": "5c131e1440b70f59ef0018dc"
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                  "$oid": "5c16fcbca74543315f00075c"
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                  "$oid": "5c1728660ee3821ffb000ea4"
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                  "$oid": "5c189e9b8ccb99fab7001e69"
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                  "$oid": "5c1af4a00ee382e7f5000115"
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                  "$oid": "5c1afec340b70f1f21000adc"
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                {
                  "$oid": "5c1c5dab62f8cb938f001898"
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                  "$oid": "5c231769c63f7d410c001304"
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                  "$oid": "5c2321dd58c9051d02004996"
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                  "$oid": "5c23232f51f3e2dda7002299"
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                {
                  "$oid": "5c25e7177b4016d169000217"
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                  "$oid": "5c25f35758c905f128009c2e"
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                  "$oid": "5c25f49158c905f27a00d114"
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                  "$oid": "5c3076ea415ee3e27b0003ee"
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                  "$oid": "5c3307da58c90558a80092eb"
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                  "$oid": "5c3317e14661fe2360000489"
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                  "$oid": "5c3317fd7ea3800cbf003c07"
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                  "$oid": "5c3319504661fe23bf00088b"
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                {
                  "$oid": "5c3456cb506058094b008a76"
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                {
                  "$oid": "5c355ba441ffd882db0005a2"
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                {
                  "$oid": "5c356104267f9c34180013f2"
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                {
                  "$oid": "5c357a870ee3828bf2000c9a"
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                {
                  "$oid": "5c35873c4661feed6b001e79"
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                  "$oid": "5c35888658c9052154007d3d"
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                  "$oid": "5c3589d9c99752c21c00364f"
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                {
                  "$oid": "5c358a914661feedd5002457"
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                {
                  "$oid": "5c358b2b58c9052154007fee"
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                  "$oid": "5c358b954661feed6b00249d"
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                  "$oid": "5c35b2b00ee382f87e00035f"
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                  "$oid": "5c35b64d20d972269c0004cc"
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                  "$oid": "5c36f98f40b70fde4c001260"
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                  "$oid": "5c380398506058130f002455"
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                  "$oid": "5c381940d66bd74e29000c2a"
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                  "$oid": "5c3d8cc807eb5ba3910003f6"
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                  "$oid": "5c3d8e55daa0cec9ad001764"
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                  "$oid": "5c4186dc6b673aeaf3000e20"
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                  "$oid": "5c4431944ab5f8b5a5001803"
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                  "$oid": "5c46bc8b41ffd849f6000780"
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                {
                  "$oid": "5c46d7125c20ec037900172f"
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                {
                  "$oid": "5c47f75a4661fe137d006e26"
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                {
                  "$oid": "5c480cba1947355ce80005bb"
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                {
                  "$oid": "5c482782ef2ea65d4e000202"
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                  "$oid": "5c4827a607eb5b76ae00189e"
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                {
                  "$oid": "5c483052c812a2585200018a"
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                {
                  "$oid": "5c484ffec812a2581c000ecb"
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                {
                  "$oid": "5c496a0e0ee382f84000001b"
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                {
                  "$oid": "5c4ab6960ee3824094000ab3"
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                {
                  "$oid": "5c4abba20ee3824094000c09"
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                {
                  "$oid": "5c4d48f4fd2cb93368000275"
                },
                {
                  "$oid": "5c4eba550ee382c36a000bd2"
                },
                {
                  "$oid": "5c4fe0b841ffd89490000ba2"
                },
                {
                  "$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

            Assignee:
            eric.sedor@mongodb.com Eric Sedor
            Reporter:
            shields@tablecheck.com Johnny Shields
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              Created:
              Updated:
              Resolved: