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[BUG] KNN filtering + constant_keyword + multiple-index search leads to sporadic and incorrect results #2373

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jackh-ncl opened this issue Dec 27, 2024 · 5 comments
Closed

[BUG] KNN filtering + constant_keyword + multiple-index search leads to sporadic and incorrect results #2373

jackh-ncl opened this issue Dec 27, 2024 · 5 comments
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bug Something isn't working

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@jackh-ncl
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Describe the bug

Filtering on a constant keyword isn't working as expected within a KNN filter clause. It sporadically gives different responses if you keep firing the request. Steps to reproduce below.

Related component

Search

To Reproduce

Index setup 
PUT http://localhost:9200/index-1
Content-Type: application/json

{
  "settings": {
    "knn": true,
    "index": {
      "number_of_shards": 5,
      "number_of_replicas": 0
    }
  },
  "mappings": {
    "properties": {
      "embedding": {
        "type": "knn_vector",
        "dimension": 3,
        "method": {
          "engine": "lucene",
          "space_type": "cosinesimil",
          "name": "hnsw",
          "parameters": {}
        }
      },
      "info": {
        "properties": {
          "category": {
            "type": "constant_keyword",
            "value" : "FOO"
          },
          "ids": {
            "type": "keyword"
          }
        }
      }
    }
  }
}

###
PUT http://localhost:9200/index-2
Content-Type: application/json

{
  "settings": {
    "knn": true,
    "index": {
      "number_of_shards": 5,
      "number_of_replicas": 0
    }
  },
  "mappings": {
    "properties": {
      "embedding": {
        "type": "knn_vector",
        "dimension": 3,
        "method": {
          "engine": "lucene",
          "space_type": "cosinesimil",
          "name": "hnsw",
          "parameters": {}
        }
      },
      "info": {
        "properties": {
          "category": {
            "type": "constant_keyword",
            "value": "BAR"
          },
          "ids": {
            "type": "keyword"
          }
        }
      }
    }
  }
}

###
PUT http://localhost:9200/_bulk
Content-Type: application/x-ndjson

< bulk-index.ndjson
bulk-index.ndjson 
{ "index": { "_index": "index-1", "_id": "1" }}
{ "embedding": [0.1, 0.2, 0.3], "info": { "ids": [1, 2, 3] } }
{ "index": { "_index": "index-1", "_id": "2" }}
{ "embedding": [0.2, 0.3, 0.4], "info": { "ids": [4, 5, 6] } }
{ "index": { "_index": "index-2", "_id": "3" }}
{ "embedding": [0.3, 0.4, 0.5], "info": { "ids": [7, 8, 9] } }
{ "index": { "_index": "index-2", "_id": "4" }}
{ "embedding": [0.4, 0.5, 0.6], "info": { "ids": [10, 11, 12] } }
Search query 
GET http://localhost:9200/index-1,index-2/_search
Content-Type: application/json

{
  "query": {
    "knn": {
      "embedding": {
        "filter": {
          "bool": {
            "must": [
              {
                "bool": {
                  "minimum_should_match": 1,
                  "should": [
                    {
                      "term": {
                        "info.ids": "10"
                      }
                    },
                    {
                      "term": {
                        "info.category": "BAR"
                      }
                    }
                  ]
                }
              }
            ],
            "must_not": []
          }
        },
        "k": 30,
        "vector": [0.2,0.3,0.4]
      }
    }
  }
}
Results

Result 1:

{
  "took": 14,
  "timed_out": false,
  "_shards": {
    "total": 10,
    "successful": 10,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 1,
      "relation": "eq"
    },
    "max_score": 0.99730575,
    "hits": [
      {
        "_index": "index-2",
        "_id": "4",
        "_score": 0.99730575,
        "_source": {
          "embedding": [
            0.4,
            0.5,
            0.6
          ],
          "info": {
            "ids": [
              10,
              11,
              12
            ]
          }
        }
      }
    ]
  }
}

Result 2:

{
  "took": 7,
  "timed_out": false,
  "_shards": {
    "total": 10,
    "successful": 10,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 4,
      "relation": "eq"
    },
    "max_score": 1.0,
    "hits": [
      {
        "_index": "index-1",
        "_id": "2",
        "_score": 1.0,
        "_source": {
          "embedding": [
            0.2,
            0.3,
            0.4
          ],
          "info": {
            "ids": [
              4,
              5,
              6
            ]
          }
        }
      },
      {
        "_index": "index-2",
        "_id": "3",
        "_score": 0.9989644,
        "_source": {
          "embedding": [
            0.3,
            0.4,
            0.5
          ],
          "info": {
            "ids": [
              7,
              8,
              9
            ]
          }
        }
      },
      {
        "_index": "index-2",
        "_id": "4",
        "_score": 0.99730575,
        "_source": {
          "embedding": [
            0.4,
            0.5,
            0.6
          ],
          "info": {
            "ids": [
              10,
              11,
              12
            ]
          }
        }
      },
      {
        "_index": "index-1",
        "_id": "1",
        "_score": 0.9962917,
        "_source": {
          "embedding": [
            0.1,
            0.2,
            0.3
          ],
          "info": {
            "ids": [
              1,
              2,
              3
            ]
          }
        }
      }
    ]
  }
}

Expected behavior

If I recreate the indices without specifying constant_keyword, I get the results I would expect (with 2 hits) as below:

Reindexed data (with category as a plain `keyword` type) 
{ "index": { "_index": "index-3", "_id": "1" }}
{ "embedding": [0.1, 0.2, 0.3], "info": { "ids": [1, 2, 3], "category": "FOO" }, }
{ "index": { "_index": "index-3", "_id": "2" }}
{ "embedding": [0.2, 0.3, 0.4], "info": { "ids": [4, 5, 6], "category": "FOO" } }
{ "index": { "_index": "index-4", "_id": "3" }}
{ "embedding": [0.3, 0.4, 0.5], "info": { "ids": [7, 8, 9], "category": "BAR" } }
{ "index": { "_index": "index-4", "_id": "4" }}
{ "embedding": [0.4, 0.5, 0.6], "info": { "ids": [10, 11, 12], "category": "BAR" } }
Results 
{
  "took": 12,
  "timed_out": false,
  "_shards": {
    "total": 10,
    "successful": 10,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 2,
      "relation": "eq"
    },
    "max_score": 0.9989644,
    "hits": [
      {
        "_index": "index-4",
        "_id": "3",
        "_score": 0.9989644,
        "_source": {
          "embedding": [
            0.3,
            0.4,
            0.5
          ],
          "info": {
            "ids": [
              7,
              8,
              9
            ],
            "category": "BAR"
          }
        }
      },
      {
        "_index": "index-4",
        "_id": "4",
        "_score": 0.99730575,
        "_source": {
          "embedding": [
            0.4,
            0.5,
            0.6
          ],
          "info": {
            "ids": [
              10,
              11,
              12
            ],
            "category": "BAR"
          }
        }
      }
    ]
  }
}

Additional Details

Plugins
n/a

Screenshots
n/a

Host/Environment (please complete the following information):
AWS OpenSearch (v2.17) and I was able to replicate the above against a v2.18 Docker container.

docker-compose service 
db-opensearch:
  container_name: db-opensearch
  image: opensearchproject/opensearch:2.18.0
  environment:
    - OPENSEARCH_JAVA_OPTS=-Xms1g -Xmx1g
    - transport.host=localhost
    - bootstrap.system_call_filter=false
    - discovery.type=single-node
    - node.name=node-1
    - plugins.security.disabled=true
    - path.repo=/usr/share/opensearch/data/snapshots
    - OPENSEARCH_INITIAL_ADMIN_PASSWORD=OpenSearch789!

Additional context
Add any other context about the problem here.
@jackh-ncl jackh-ncl added bug Something isn't working untriaged labels Dec 27, 2024
@navneet1v
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Collaborator

Can someone from Opensearch core move this issue to k-NN repo. @opensearch-project/admin

@gaiksaya gaiksaya transferred this issue from opensearch-project/OpenSearch Jan 8, 2025
@jackh-ncl
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jackh-ncl commented Jan 10, 2025 •
edited
Loading

To help make my example more minimal, the following also runs into the same problem (sporadically returning either 4 hits or 0):

GET http://localhost:9200/index-1,index-2/_search
Content-Type: application/json

{
  "query": {
    "knn": {
      "embedding": {
        "filter": {
          "term": {
            "info.category": "BAR"
          }
        },
        "k": 30,
        "vector": [
          0.2,
          0.3,
          0.4
        ]
      }
    }
  }
}

@jackh-ncl
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Author

0 hits response (with `profile` enabled) 
GET http://localhost:9200/index-1,index-2/_search?explain=true

HTTP/1.1 200 OK
TASK_RESOURCE_USAGE: {"action":"indices:data/read/search[phase/query]","taskId":1857,"parentTaskId":1847,"nodeId":"UCeVNJKHT9yggFJSwa_Atw","taskResourceUsage":{"cpu_time_in_nanos":1003083,"memory_in_bytes":23296}}
TASK_RESOURCE_USAGE: {"action":"indices:data/read/search[phase/query]","taskId":1848,"parentTaskId":1847,"nodeId":"UCeVNJKHT9yggFJSwa_Atw","taskResourceUsage":{"cpu_time_in_nanos":5204458,"memory_in_bytes":21312}}
content-type: application/json; charset=UTF-8
content-encoding: gzip
content-length: 1001

{
  "took": 32,
  "timed_out": false,
  "_shards": {
    "total": 10,
    "successful": 10,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 0,
      "relation": "eq"
    },
    "max_score": null,
    "hits": []
  },
  "profile": {
    "shards": [
      {
        "id": "[UCeVNJKHT9yggFJSwa_Atw][index-1][0]",
        "inbound_network_time_in_millis": 0,
        "outbound_network_time_in_millis": 0,
        "searches": [
          {
            "query": [
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"User requested \"match_none\" query.\")",
                "time_in_nanos": 1250,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 0,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 0,
                  "create_weight": 1250
                }
              },
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"\")",
                "time_in_nanos": 792,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 0,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 0,
                  "create_weight": 792
                }
              }
            ],
            "rewrite_time": 754193902759,
            "collector": [
              {
                "name": "SimpleTopScoreDocCollector",
                "reason": "search_top_hits",
                "time_in_nanos": 875
              }
            ]
          }
        ],
        "aggregations": []
      },
      {
        "id": "[UCeVNJKHT9yggFJSwa_Atw][index-1][1]",
        "inbound_network_time_in_millis": 0,
        "outbound_network_time_in_millis": 0,
        "searches": [
          {
            "query": [
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"User requested \"match_none\" query.\")",
                "time_in_nanos": 1417,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 0,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 0,
                  "create_weight": 1417
                }
              },
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"\")",
                "time_in_nanos": 1250,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 0,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 0,
                  "create_weight": 1250
                }
              }
            ],
            "rewrite_time": 754193881467,
            "collector": [
              {
                "name": "SimpleTopScoreDocCollector",
                "reason": "search_top_hits",
                "time_in_nanos": 61750
              }
            ]
          }
        ],
        "aggregations": []
      },
      {
        "id": "[UCeVNJKHT9yggFJSwa_Atw][index-1][2]",
        "inbound_network_time_in_millis": 0,
        "outbound_network_time_in_millis": 0,
        "searches": [
          {
            "query": [
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"User requested \"match_none\" query.\")",
                "time_in_nanos": 500,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 0,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 0,
                  "create_weight": 500
                }
              },
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"\")",
                "time_in_nanos": 667,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 0,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 0,
                  "create_weight": 667
                }
              }
            ],
            "rewrite_time": 754193854635,
            "collector": [
              {
                "name": "SimpleTopScoreDocCollector",
                "reason": "search_top_hits",
                "time_in_nanos": 458
              }
            ]
          }
        ],
        "aggregations": []
      },
      {
        "id": "[UCeVNJKHT9yggFJSwa_Atw][index-1][3]",
        "inbound_network_time_in_millis": 0,
        "outbound_network_time_in_millis": 0,
        "searches": [
          {
            "query": [
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"User requested \"match_none\" query.\")",
                "time_in_nanos": 22624,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 21666,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 2,
                  "create_weight": 958
                }
              },
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"\")",
                "time_in_nanos": 2166,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 1249,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 2,
                  "create_weight": 917
                }
              }
            ],
            "rewrite_time": 754199264301,
            "collector": [
              {
                "name": "SimpleTopScoreDocCollector",
                "reason": "search_top_hits",
                "time_in_nanos": 2165
              }
            ]
          }
        ],
        "aggregations": []
      },
      {
        "id": "[UCeVNJKHT9yggFJSwa_Atw][index-1][4]",
        "inbound_network_time_in_millis": 0,
        "outbound_network_time_in_millis": 0,
        "searches": [
          {
            "query": [
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"User requested \"match_none\" query.\")",
                "time_in_nanos": 56000,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 55333,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 2,
                  "create_weight": 667
                }
              },
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"\")",
                "time_in_nanos": 1457,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 1166,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 2,
                  "create_weight": 291
                }
              }
            ],
            "rewrite_time": 754199294800,
            "collector": [
              {
                "name": "SimpleTopScoreDocCollector",
                "reason": "search_top_hits",
                "time_in_nanos": 1877
              }
            ]
          }
        ],
        "aggregations": []
      },
      {
        "id": "[UCeVNJKHT9yggFJSwa_Atw][index-2][0]",
        "inbound_network_time_in_millis": 0,
        "outbound_network_time_in_millis": 0,
        "searches": [
          {
            "query": [
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"User requested \"match_none\" query.\")",
                "time_in_nanos": 1292,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 0,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 0,
                  "create_weight": 1292
                }
              },
              {
                "type": "MatchNoDocsQuery",
                "description": "MatchNoDocsQuery(\"\")",
                "time_in_nanos": 292,
                "breakdown": {
                  "set_min_competitive_score_count": 0,
                  "match_count": 0,
                  "shallow_advance_count": 0,
                  "next_doc": 0,
                  "score_count": 0,
                  "compute_max_score_count": 0,
                  "advance": 0,
                  "advance_count": 0,
                  "score": 0,
                  "shallow_advance": 0,
                  "create_weight_count": 1,
                  "build_scorer": 0,
                  "set_min_competitive_score": 0,
                  "match": 0,
                  "next_doc_count": 0,
                  "compute_max_score": 0,
                  "build_scorer_count": 0,
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Response file saved.
> 2025-01-10T173218.200.json

Response code: 200 (OK); Time: 78ms (78 ms); Content length: 12694 bytes (12.69 kB)
4 hits response (with `profile` enabled) 
GET http://localhost:9200/index-1,index-2/_search?explain=true

HTTP/1.1 200 OK
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content-type: application/json; charset=UTF-8
content-encoding: gzip
content-length: 1632

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Response file saved.
> 2025-01-10T173131.200.json

Response code: 200 (OK); Time: 217ms (217 ms); Content length: 17974 bytes (17.97 kB)

@jackh-ncl
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Unable to replicate when running against main branch of k-NN repo. I think it may have been fixed by this PR.

@navneet1v
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@jackh-ncl thanks for update. @buddharajusahil thanks for fixing multiple bugs with 1 PR. Closing this GH issue.

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