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Fix the word_docids capacity limit detection

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Clément Renault 2020-09-27 11:46:52 +02:00
parent 25b2853b70
commit d8354f6f02
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GPG Key ID: 92ADA4E935E71FA4
2 changed files with 29 additions and 31 deletions
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48
src/bin/indexer.rs
View File

@ -91,7 +91,7 @@ struct IndexerOpt {
/// Size of the linked hash map cache when indexing.
/// The bigger it is, the faster the indexing is but the more memory it takes.
#[structopt(long, default_value = "4096")]
#[structopt(long, default_value = "1048576")]
linked_hash_map_size: usize,
/// The name of the compression algorithm to use when compressing intermediate
@ -169,9 +169,10 @@ type MergeFn = fn(&[u8], &[Vec<u8>]) -> Result<Vec<u8>, ()>;
struct Store {
word_docids: LinkedHashMap<SmallVec32<u8>, RoaringBitmap>,
word_docids_limit: usize,
documents_ids: RoaringBitmap,
sorter: Sorter<MergeFn>,
documents_sorter: Sorter<MergeFn>,
documents_writer: Writer<File>,
chunk_compression_type: CompressionType,
chunk_compression_level: Option<u32>,
}
@ -183,7 +184,7 @@ impl Store {
max_memory: Option<usize>,
chunk_compression_type: CompressionType,
chunk_compression_level: Option<u32>,
) -> Store
) -> anyhow::Result<Store>
{
let mut builder = Sorter::builder(merge as MergeFn);
builder.chunk_compression_type(chunk_compression_type);
@ -197,35 +198,36 @@ impl Store {
builder.max_memory(memory);
}
let mut documents_builder = Sorter::builder(docs_merge as MergeFn);
documents_builder.chunk_compression_type(chunk_compression_type);
let mut documents_builder = Writer::builder();
documents_builder.compression_type(chunk_compression_type);
if let Some(level) = chunk_compression_level {
builder.chunk_compression_level(level);
documents_builder.compression_level(level);
}
let documents_writer = tempfile::tempfile().map(|f| documents_builder.build(f))?;
Store {
// We overflow by one before poping the LRU element.
word_docids: LinkedHashMap::with_capacity(linked_hash_map_size + 1),
Ok(Store {
word_docids: LinkedHashMap::with_capacity(linked_hash_map_size),
word_docids_limit: linked_hash_map_size,
documents_ids: RoaringBitmap::new(),
sorter: builder.build(),
documents_sorter: documents_builder.build(),
documents_writer,
chunk_compression_type,
chunk_compression_level,
}
})
}
// Save the documents ids under the position and word we have seen it.
fn insert_word_docid(&mut self, word: &str, id: DocumentId) -> anyhow::Result<()> {
let word_vec = SmallVec32::from(word.as_bytes());
// if get_refresh finds the element it is assured to be at the end of the linked hash map.
match self.word_docids.get_refresh(&word_vec) {
match self.word_docids.get_refresh(word.as_bytes()) {
Some(old) => { old.insert(id); },
None => {
let word_vec = SmallVec32::from(word.as_bytes());
// A newly inserted element is append at the end of the linked hash map.
self.word_docids.insert(word_vec, RoaringBitmap::from_iter(Some(id)));
// If the word docids just reached it's capacity we must make sure to remove
// one element, this way next time we insert we doesn't grow the capacity.
if self.word_docids.len() == self.word_docids.capacity() {
if self.word_docids.len() == self.word_docids_limit {
// Removing the front element is equivalent to removing the LRU element.
let lru = self.word_docids.pop_front();
Self::write_word_docids(&mut self.sorter, lru)?;
@ -261,7 +263,7 @@ impl Store {
.with_context(|| format!("could not encode CSV record"))?;
self.documents_ids.insert(document_id);
self.documents_sorter.insert(document_id.to_be_bytes(), record)?;
self.documents_writer.insert(document_id.to_be_bytes(), record)?;
Self::write_docid_word_positions(&mut self.sorter, document_id, words_positions)?;
Ok(())
@ -436,10 +438,7 @@ impl Store {
let fst = builder.into_set();
wtr.insert(WORDS_FST_KEY, fst.as_fst().as_bytes())?;
let docs_wtr_file = tempfile::tempfile()?;
let mut docs_wtr = create_writer(compression_type, compression_level, docs_wtr_file);
self.documents_sorter.write_into(&mut docs_wtr)?;
let docs_file = docs_wtr.into_inner()?;
let docs_file = self.documents_writer.into_inner()?;
let docs_mmap = unsafe { Mmap::map(&docs_file)? };
let docs_reader = Reader::new(docs_mmap)?;
@ -451,12 +450,6 @@ impl Store {
}
}
fn docs_merge(key: &[u8], values: &[Vec<u8>]) -> Result<Vec<u8>, ()> {
let key = key.try_into().unwrap();
let id = u32::from_be_bytes(key);
panic!("documents must not conflict ({} with {} values)!", id, values.len())
}
fn merge(key: &[u8], values: &[Vec<u8>]) -> Result<Vec<u8>, ()> {
match key {
WORDS_FST_KEY => {
@ -633,13 +626,14 @@ fn main() -> anyhow::Result<()> {
.into_par_iter()
.enumerate()
.map(|(i, rdr)| {
Store::new(
let store = Store::new(
linked_hash_map_size,
max_nb_chunks,
Some(max_memory),
chunk_compression_type,
chunk_compression_level,
).index_csv(rdr, i, num_threads)
)?;
store.index_csv(rdr, i, num_threads)
})
.collect::<Result<Vec<_>, _>>()?;

12
src/search.rs
View File

@ -217,10 +217,14 @@ impl<'a> Search<'a> {
eprintln!("found pairs {:?}", pairs);
let mut pairs_union = RoaringBitmap::new();
for (w1, w2) in pairs {
let key = (w1, w2, 1);
if let Some(docids) = index.word_pair_proximity_docids.get(rtxn, &key)? {
pairs_union.union_with(&docids);
'pairs: for (w1, w2) in pairs {
for prox in 1..=7 {
let key = (w1, w2, prox);
eprintln!("{:?}", key);
if let Some(docids) = index.word_pair_proximity_docids.get(rtxn, &key)? {
pairs_union.union_with(&docids);
continue 'pairs;
}
}
}