Added code changes to support field level stat on segment #18973
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## main #18973 +/- ##
============================================
+ Coverage 72.96% 73.01% +0.04%
- Complexity 69396 69522 +126
============================================
Files 5647 5649 +2
Lines 319013 319380 +367
Branches 46151 46221 +70
============================================
+ Hits 232764 233180 +416
+ Misses 67390 67351 -39
+ Partials 18859 18849 -10 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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Signed-off-by: Abhinav Tripathi <[email protected]>
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This PR is stalled because it has been open for 30 days with no activity. |
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Summary
This PR implements on-demand field-level segment statistics with intelligent caching and statistical sampling, providing accurate field-level storage metrics while maintaining system performance and stability.
Key Features
Issue
Implements #12113
Technical Architecture
High-Level Implementation Approach
The implementation follows a five-step calculation flow designed for accuracy and performance:
Core Components
FieldLevelSegmentStatsCalculator
FieldLevelStatsCache
Proportional Attribution Strategy
The core innovation is the proportional attribution algorithm that solves the challenge of shared file attribution. Since Lucene stores multiple fields in shared files, the system:
Smart Sampling for Large Segments
For segments larger than 1GB, the system employs stratified sampling:
_sampled,_sampling_rate) to inform users of samplingTesting
Local env Testing
Created an index and ingested ~5000 docs in it
Mapping
curl -X GET "http://localhost:9200/test-products/_mapping?pretty"{ "test-products" : { "mappings" : { "properties" : { "brand" : { "type" : "keyword" }, "category" : { "type" : "keyword" }, "created_at" : { "type" : "date" }, "description" : { "type" : "text" }, "inventory_count" : { "type" : "integer" }, "price" : { "type" : "float" }, "tags" : { "type" : "keyword" }, "title" : { "type" : "text", "fields" : { "keyword" : { "type" : "keyword" } } } } } } }Stats api
curl "http://localhost:9200/test-products/_stats/segments?include_field_level_segment_file_sizes=true&pretty"{ "_shards" : { "total" : 1, "successful" : 1, "failed" : 0 }, "_all" : { "primaries" : { "segments" : { "count" : 1, "memory_in_bytes" : 0, "terms_memory_in_bytes" : 0, "stored_fields_memory_in_bytes" : 0, "term_vectors_memory_in_bytes" : 0, "norms_memory_in_bytes" : 0, "points_memory_in_bytes" : 0, "doc_values_memory_in_bytes" : 0, "index_writer_memory_in_bytes" : 0, "version_map_memory_in_bytes" : 0, "fixed_bit_set_memory_in_bytes" : 0, "max_unsafe_auto_id_timestamp" : -1, "remote_store" : { "upload" : { "total_upload_size" : { "started_bytes" : 0, "succeeded_bytes" : 0, "failed_bytes" : 0 }, "refresh_size_lag" : { "total_bytes" : 0, "max_bytes" : 0 }, "max_refresh_time_lag_in_millis" : 0, "total_time_spent_in_millis" : 0, "pressure" : { "total_rejections" : 0 } }, "download" : { "total_download_size" : { "started_bytes" : 0, "succeeded_bytes" : 0, "failed_bytes" : 0 }, "total_time_spent_in_millis" : 0 } }, "segment_replication" : { "max_bytes_behind" : 0, "total_bytes_behind" : 0, "max_replication_lag" : 0 }, "file_sizes" : { }, "field_level_file_sizes" : { "description" : { "pos" : { "size_in_bytes" : 104540, "description" : "Positions" }, "tim" : { "size_in_bytes" : 209578, "description" : "Term Dictionary" }, "tip" : { "size_in_bytes" : 20957, "description" : "Term Index" } }, "created_at" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 40040, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "title" : { "pos" : { "size_in_bytes" : 60044, "description" : "Positions" }, "tim" : { "size_in_bytes" : 195523, "description" : "Term Dictionary" }, "tip" : { "size_in_bytes" : 19552, "description" : "Term Index" } }, "tags" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 77241, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 7724, "description" : "Term Index" } }, "title.keyword" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 115115, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 11511, "description" : "Term Index" } }, "_seq_no" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 40040, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "price" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 20020, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "inventory_count" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 20020, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "_id" : { "tim" : { "size_in_bytes" : 115115, "description" : "Term Dictionary" }, "tip" : { "size_in_bytes" : 11511, "description" : "Term Index" } }, "category" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 40190, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 4019, "description" : "Term Index" } }, "_primary_term" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "_version" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "brand" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 40190, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 4019, "description" : "Term Index" } } } } }, "total" : { "segments" : { "count" : 1, "memory_in_bytes" : 0, "terms_memory_in_bytes" : 0, "stored_fields_memory_in_bytes" : 0, "term_vectors_memory_in_bytes" : 0, "norms_memory_in_bytes" : 0, "points_memory_in_bytes" : 0, "doc_values_memory_in_bytes" : 0, "index_writer_memory_in_bytes" : 0, "version_map_memory_in_bytes" : 0, "fixed_bit_set_memory_in_bytes" : 0, "max_unsafe_auto_id_timestamp" : -1, "remote_store" : { "upload" : { "total_upload_size" : { "started_bytes" : 0, "succeeded_bytes" : 0, "failed_bytes" : 0 }, "refresh_size_lag" : { "total_bytes" : 0, "max_bytes" : 0 }, "max_refresh_time_lag_in_millis" : 0, "total_time_spent_in_millis" : 0, "pressure" : { "total_rejections" : 0 } }, "download" : { "total_download_size" : { "started_bytes" : 0, "succeeded_bytes" : 0, "failed_bytes" : 0 }, "total_time_spent_in_millis" : 0 } }, "segment_replication" : { "max_bytes_behind" : 0, "total_bytes_behind" : 0, "max_replication_lag" : 0 }, "file_sizes" : { }, "field_level_file_sizes" : { "description" : { "pos" : { "size_in_bytes" : 104540, "description" : "Positions" }, "tim" : { "size_in_bytes" : 209578, "description" : "Term Dictionary" }, "tip" : { "size_in_bytes" : 20957, "description" : "Term Index" } }, "created_at" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 40040, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "title" : { "pos" : { "size_in_bytes" : 60044, "description" : "Positions" }, "tim" : { "size_in_bytes" : 195523, "description" : "Term Dictionary" }, "tip" : { "size_in_bytes" : 19552, "description" : "Term Index" } }, "tags" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 77241, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 7724, "description" : "Term Index" } }, "title.keyword" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 115115, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 11511, "description" : "Term Index" } }, "_seq_no" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 40040, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "price" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 20020, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "inventory_count" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 20020, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "_id" : { "tim" : { "size_in_bytes" : 115115, "description" : "Term Dictionary" }, "tip" : { "size_in_bytes" : 11511, "description" : "Term Index" } }, "category" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 40190, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 4019, "description" : "Term Index" } }, "_primary_term" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "_version" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "brand" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 40190, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 4019, "description" : "Term Index" } } } } } }, "indices" : { "test-products" : { "uuid" : "fFutTWqWREaFVjI2_DICRQ", "primaries" : { "segments" : { "count" : 1, "memory_in_bytes" : 0, "terms_memory_in_bytes" : 0, "stored_fields_memory_in_bytes" : 0, "term_vectors_memory_in_bytes" : 0, "norms_memory_in_bytes" : 0, "points_memory_in_bytes" : 0, "doc_values_memory_in_bytes" : 0, "index_writer_memory_in_bytes" : 0, "version_map_memory_in_bytes" : 0, "fixed_bit_set_memory_in_bytes" : 0, "max_unsafe_auto_id_timestamp" : -1, "remote_store" : { "upload" : { "total_upload_size" : { "started_bytes" : 0, "succeeded_bytes" : 0, "failed_bytes" : 0 }, "refresh_size_lag" : { "total_bytes" : 0, "max_bytes" : 0 }, "max_refresh_time_lag_in_millis" : 0, "total_time_spent_in_millis" : 0, "pressure" : { "total_rejections" : 0 } }, "download" : { "total_download_size" : { "started_bytes" : 0, "succeeded_bytes" : 0, "failed_bytes" : 0 }, "total_time_spent_in_millis" : 0 } }, "segment_replication" : { "max_bytes_behind" : 0, "total_bytes_behind" : 0, "max_replication_lag" : 0 }, "file_sizes" : { }, "field_level_file_sizes" : { "description" : { "pos" : { "size_in_bytes" : 104540, "description" : "Positions" }, "tim" : { "size_in_bytes" : 209578, "description" : "Term Dictionary" }, "tip" : { "size_in_bytes" : 20957, "description" : "Term Index" } }, "created_at" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 40040, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "title" : { "pos" : { "size_in_bytes" : 60044, "description" : "Positions" }, "tim" : { "size_in_bytes" : 195523, "description" : "Term Dictionary" }, "tip" : { "size_in_bytes" : 19552, "description" : "Term Index" } }, "tags" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 77241, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 7724, "description" : "Term Index" } }, "title.keyword" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 115115, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 11511, "description" : "Term Index" } }, "_seq_no" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 40040, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "price" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 20020, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "inventory_count" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dii" : { "size_in_bytes" : 40040, "description" : "Points" }, "dim" : { "size_in_bytes" : 20020, "description" : "Points" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "_id" : { "tim" : { "size_in_bytes" : 115115, "description" : "Term Dictionary" }, "tip" : { "size_in_bytes" : 11511, "description" : "Term Index" } }, "category" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 40190, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 4019, "description" : "Term Index" } }, "_primary_term" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "_version" : { "dvd" : { "size_in_bytes" : 40040, "description" : "DocValues" }, "dvm" : { "size_in_bytes" : 4004, "description" : "DocValues" } }, "brand" : { "dvd" : { "size_in_bytes" : 80080, "description" : "DocValues" }, "tim" : { "size_in_bytes" : 40190, "description" : "Term Dictionary" }, "dvm" : { "size_in_bytes" : 8008, "description" : "DocValues" }, "tip" : { "size_in_bytes" : 4019, "description" : "Term Index" } } } } }, "total" : { "segments" : { "count" : 1, "memory_in_bytes" : 0, "terms_memory_in_bytes" : 0, "stored_fields_memory_in_bytes" : 0, "term_vectors_memory_in_bytes" : 0, "norms_memory_in_bytes" : 0, "points_memory_in_bytes" : 0, "doc_values_memory_in_bytes" : 0, 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