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Truncate facet values that are too long before indexing them

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This commit is contained in:
Loïc Lecrenier 2022-11-16 14:03:27 +01:00
parent 990a861241
commit ac3baafbe8
3 changed files with 37 additions and 9 deletions
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17
milli/src/update/index_documents/extract/extract_facet_string_docids.rs
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@ -6,7 +6,8 @@ use heed::BytesEncode;
use super::helpers::{create_sorter, sorter_into_reader, try_split_array_at, GrenadParameters};
use crate::heed_codec::facet::{FacetGroupKey, FacetGroupKeyCodec};
use crate::heed_codec::StrRefCodec;
use crate::update::index_documents::{merge_cbo_roaring_bitmaps, valid_lmdb_key};
use crate::update::index_documents::helpers::MAX_FACET_VALUE_LENGTH;
use crate::update::index_documents::merge_cbo_roaring_bitmaps;
use crate::{FieldId, Result};
/// Extracts the facet string and the documents ids where this facet string appear.
@ -38,14 +39,22 @@ pub fn extract_facet_string_docids<R: io::Read + io::Seek>(
try_split_array_at::<_, 4>(bytes).unwrap();
let document_id = u32::from_be_bytes(document_id_bytes);
let normalised_value = std::str::from_utf8(normalized_value_bytes)?;
let mut normalised_value = std::str::from_utf8(normalized_value_bytes)?;
let normalised_truncated_value: String;
if normalised_value.len() > MAX_FACET_VALUE_LENGTH {
normalised_truncated_value = normalised_value
.char_indices()
.take_while(|(idx, _)| idx + 4 < MAX_FACET_VALUE_LENGTH)
.map(|(_, c)| c)
.collect();
normalised_value = normalised_truncated_value.as_str();
}
let key = FacetGroupKey { field_id, level: 0, left_bound: normalised_value };
let key_bytes = FacetGroupKeyCodec::<StrRefCodec>::bytes_encode(&key).unwrap();
if valid_lmdb_key(&key_bytes) {
// document id is encoded in native-endian because of the CBO roaring bitmap codec
facet_string_docids_sorter.insert(&key_bytes, document_id.to_ne_bytes())?;
}
}
sorter_into_reader(facet_string_docids_sorter, indexer)
}

9
milli/src/update/index_documents/extract/extract_fid_docid_facet_values.rs
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@ -12,6 +12,7 @@ use serde_json::Value;
use super::helpers::{create_sorter, keep_first, sorter_into_reader, GrenadParameters};
use crate::error::InternalError;
use crate::facet::value_encoding::f64_into_bytes;
use crate::update::index_documents::helpers::MAX_FACET_VALUE_LENGTH;
use crate::update::index_documents::{create_writer, writer_into_reader};
use crate::{CboRoaringBitmapCodec, DocumentId, FieldId, Result, BEU32};
@ -87,8 +88,14 @@ pub fn extract_fid_docid_facet_values<R: io::Read + io::Seek>(
// insert normalized and original facet string in sorter
for (normalized, original) in strings.into_iter().filter(|(n, _)| !n.is_empty()) {
let normalised_truncated_value: String = normalized
.char_indices()
.take_while(|(idx, _)| idx + 4 < MAX_FACET_VALUE_LENGTH)
.map(|(_, c)| c)
.collect();
key_buffer.truncate(size_of::<FieldId>() + size_of::<DocumentId>());
key_buffer.extend_from_slice(normalized.as_bytes());
key_buffer.extend_from_slice(normalised_truncated_value.as_bytes());
fid_docid_facet_strings_sorter.insert(&key_buffer, original.as_bytes())?;
}
}

14
milli/src/update/index_documents/helpers/mod.rs
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@ -18,8 +18,20 @@ pub use merge_functions::{
serialize_roaring_bitmap, MergeFn,
};
/// The maximum length a LMDB key can be.
///
/// Note that the actual allowed length is a little bit higher, but
/// we keep a margin of safety.
const MAX_LMDB_KEY_LENGTH: usize = 500;
/// The maximum length a field value can be when inserted in an LMDB key.
///
/// This number is determined by the keys of the different facet databases
/// and adding a margin of safety.
pub const MAX_FACET_VALUE_LENGTH: usize = MAX_LMDB_KEY_LENGTH - 20;
/// The maximum length a word can be
pub const MAX_WORD_LENGTH: usize = 250;
pub const MAX_WORD_LENGTH: usize = MAX_LMDB_KEY_LENGTH / 2;
pub fn valid_lmdb_key(key: impl AsRef<[u8]>) -> bool {
key.as_ref().len() <= MAX_WORD_LENGTH * 2 && !key.as_ref().is_empty()