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Merging the main, word docids and words pairs proximity docids in parallel

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This commit is contained in:
Clément Renault 2020-10-04 18:40:34 +02:00
parent 99705deb7d
commit 9af946a306
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GPG Key ID: 92ADA4E935E71FA4
1 changed files with 64 additions and 19 deletions
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83
src/bin/indexer.rs
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@ -616,6 +616,12 @@ fn documents_merge(key: &[u8], _values: &[Vec<u8>]) -> Result<Vec<u8>, ()> {
panic!("merging documents is an error ({:?})", key.as_bstr())
}
fn merge_readers(sources: Vec<Reader<Mmap>>, merge: MergeFn) -> Merger<Mmap, MergeFn> {
let mut builder = Merger::builder(merge);
builder.extend(sources);
builder.build()
}
fn merge_into_lmdb_database(
wtxn: &mut heed::RwTxn,
database: heed::PolyDatabase,
@ -625,11 +631,28 @@ fn merge_into_lmdb_database(
debug!("Merging {} MTBL stores...", sources.len());
let before = Instant::now();
let mut builder = Merger::builder(merge);
builder.extend(sources);
let merger = builder.build();
let merger = merge_readers(sources, merge);
let mut in_iter = merger.into_merge_iter()?;
let mut out_iter = database.iter_mut::<_, ByteSlice, ByteSlice>(wtxn)?;
while let Some(result) = in_iter.next() {
let (k, v) = result?;
out_iter.append(k, v).with_context(|| format!("writing {:?} into LMDB", k.as_bstr()))?;
}
debug!("MTBL stores merged in {:.02?}!", before.elapsed());
Ok(())
}
fn write_into_lmdb_database(
wtxn: &mut heed::RwTxn,
database: heed::PolyDatabase,
reader: Reader<Mmap>,
) -> anyhow::Result<()> {
debug!("Writing MTBL stores...");
let before = Instant::now();
let mut in_iter = reader.into_iter()?;
let mut out_iter = database.iter_mut::<_, ByteSlice, ByteSlice>(wtxn)?;
while let Some(result) = in_iter.next() {
let (k, v) = result?;
@ -742,39 +765,61 @@ fn main() -> anyhow::Result<()> {
})
.collect::<Result<Vec<_>, _>>()?;
let mut main_stores = Vec::with_capacity(readers.len());
let mut word_docids_stores = Vec::with_capacity(readers.len());
let mut docid_word_positions_stores = Vec::with_capacity(readers.len());
let mut words_pairs_proximities_docids_stores = Vec::with_capacity(readers.len());
let mut documents_stores = Vec::with_capacity(readers.len());
let mut main_readers = Vec::with_capacity(readers.len());
let mut word_docids_readers = Vec::with_capacity(readers.len());
let mut docid_word_positions_readers = Vec::with_capacity(readers.len());
let mut words_pairs_proximities_docids_readers = Vec::with_capacity(readers.len());
let mut documents_readers = Vec::with_capacity(readers.len());
readers.into_iter().for_each(|readers| {
main_stores.push(readers.main);
word_docids_stores.push(readers.word_docids);
docid_word_positions_stores.push(readers.docid_word_positions);
words_pairs_proximities_docids_stores.push(readers.words_pairs_proximities_docids);
documents_stores.push(readers.documents);
main_readers.push(readers.main);
word_docids_readers.push(readers.word_docids);
docid_word_positions_readers.push(readers.docid_word_positions);
words_pairs_proximities_docids_readers.push(readers.words_pairs_proximities_docids);
documents_readers.push(readers.documents);
});
let merge_readers = |readers, merge| {
let mut writer = tempfile().map(|f| {
create_writer(chunk_compression_type, chunk_compression_level, f)
})?;
let merger = merge_readers(readers, merge);
merger.write_into(&mut writer)?;
writer_into_reader(writer)
};
debug!("Merging the main, word docids and words pairs proximity docids in parallel...");
let (main, (word_docids, words_pairs_proximities_docids)) = rayon::join(move || {
merge_readers(main_readers, main_merge)
}, || rayon::join(|| {
merge_readers(word_docids_readers, word_docids_merge)
}, || {
merge_readers(words_pairs_proximities_docids_readers, words_pairs_proximities_docids_merge)
}));
let main = main?;
let word_docids = word_docids?;
let words_pairs_proximities_docids = words_pairs_proximities_docids?;
let mut wtxn = env.write_txn()?;
debug!("Writing the main elements into LMDB on disk...");
merge_into_lmdb_database(&mut wtxn, index.main, main_stores, main_merge)?;
write_into_lmdb_database(&mut wtxn, index.main, main)?;
debug!("Writing the words docids into LMDB on disk...");
let db = *index.word_docids.as_polymorph();
merge_into_lmdb_database(&mut wtxn, db, word_docids_stores, word_docids_merge)?;
write_into_lmdb_database(&mut wtxn, db, word_docids)?;
debug!("Writing the docid word positions into LMDB on disk...");
let db = *index.docid_word_positions.as_polymorph();
merge_into_lmdb_database(&mut wtxn, db, docid_word_positions_stores, docid_word_positions_merge)?;
merge_into_lmdb_database(&mut wtxn, db, docid_word_positions_readers, docid_word_positions_merge)?;
debug!("Writing the words pairs proximities docids into LMDB on disk...");
let db = *index.word_pair_proximity_docids.as_polymorph();
merge_into_lmdb_database(&mut wtxn, db, words_pairs_proximities_docids_stores, words_pairs_proximities_docids_merge)?;
write_into_lmdb_database(&mut wtxn, db, words_pairs_proximities_docids)?;
debug!("Writing the documents into LMDB on disk...");
let db = *index.documents.as_polymorph();
merge_into_lmdb_database(&mut wtxn, db, documents_stores, documents_merge)?;
merge_into_lmdb_database(&mut wtxn, db, documents_readers, documents_merge)?;
debug!("Retrieving the number of documents...");
let count = index.number_of_documents(&wtxn)?;