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Introduce a new indexer which uses an MTBL sorter

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This commit is contained in:
Clément Renault 2020-08-04 15:19:21 +02:00
parent 3f21760d56
commit bd4b18541c
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GPG Key ID: 92ADA4E935E71FA4
4 changed files with 259 additions and 269 deletions
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2
.gitignore vendored
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@ -1 +1,3 @@
/target
*.csv
*.mmdb

27
Cargo.lock generated
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@ -21,6 +21,14 @@ version = "1.0.31"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "85bb70cc08ec97ca5450e6eba421deeea5f172c0fc61f78b5357b2a8e8be195f"
[[package]]
name = "arc-cache"
version = "0.2.4"
source = "git+https://github.com/Kerollmops/rust-arc-cache.git?rev=56530f2#56530f2d219823f8f88dc03851f8fe057bd72564"
dependencies = [
"xlru-cache",
]
[[package]]
name = "arc-swap"
version = "0.4.6"
@ -892,6 +900,12 @@ version = "0.2.70"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3baa92041a6fec78c687fa0cc2b3fae8884f743d672cf551bed1d6dac6988d0f"
[[package]]
name = "linked-hash-map"
version = "0.5.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8dd5a6d5999d9907cda8ed67bbd137d3af8085216c2ac62de5be860bd41f304a"
[[package]]
name = "lmdb-rkv-sys"
version = "0.11.0"
@ -963,6 +977,7 @@ name = "milli"
version = "0.1.0"
dependencies = [
"anyhow",
"arc-cache",
"askama",
"askama_warp",
"bitpacking",
@ -1200,12 +1215,14 @@ checksum = "2839e79665f131bdb5782e51f2c6c9599c133c6098982a54c794358bf432529c"
[[package]]
name = "oxidized-mtbl"
version = "0.1.0"
source = "git+https://github.com/Kerollmops/oxidized-mtbl.git?rev=9451be8#9451be8829562f7d1f8d34aa3ecb81c5106a0623"
source = "git+https://github.com/Kerollmops/oxidized-mtbl.git?rev=6b8a3a8#6b8a3a83a8b83bfdba38f7ea67bfa5868e668741"
dependencies = [
"byteorder",
"crc32c",
"flate2",
"memmap",
"snap",
"tempfile",
"zstd",
]
@ -2340,6 +2357,14 @@ dependencies = [
"winapi-build",
]
[[package]]
name = "xlru-cache"
version = "0.1.2"
source = "git+https://github.com/Kerollmops/rust-xlru-cache.git?rev=3c90f49#3c90f49e11758ee0cc4ff145b2606ba143188b77"
dependencies = [
"linked-hash-map",
]
[[package]]
name = "zerocopy"
version = "0.3.0"

3
Cargo.toml
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@ -18,7 +18,8 @@ jemallocator = "0.3.2"
levenshtein_automata = { version = "0.2.0", features = ["fst_automaton"] }
memmap = "0.7.0"
once_cell = "1.4.0"
oxidized-mtbl = { git = "https://github.com/Kerollmops/oxidized-mtbl.git", rev = "9451be8" }
oxidized-mtbl = { git = "https://github.com/Kerollmops/oxidized-mtbl.git", rev = "6b8a3a8" }
arc-cache = { git = "https://github.com/Kerollmops/rust-arc-cache.git", rev = "56530f2" }
rayon = "1.3.1"
roaring = { git = "https://github.com/Kerollmops/roaring-rs.git", branch = "mem-usage" }
slice-group-by = "0.2.6"

496
src/bin/indexer.rs
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@ -1,24 +1,26 @@
use std::collections::hash_map::Entry;
use std::collections::{HashMap, BTreeSet};
use std::collections::HashMap;
use std::convert::{TryFrom, TryInto};
use std::fs::File;
use std::mem;
use std::iter::FromIterator;
use std::path::PathBuf;
use std::time::Instant;
use anyhow::Context;
use arc_cache::ArcCache;
use cow_utils::CowUtils;
use fst::{Streamer, IntoStreamer};
use heed::EnvOpenOptions;
use heed::types::*;
use log::debug;
use oxidized_mtbl::{Reader, ReaderOptions, Writer, Merger, MergerOptions};
use memmap::Mmap;
use oxidized_mtbl::{Reader, Writer, Merger, Sorter, CompressionType};
use rayon::prelude::*;
use roaring::RoaringBitmap;
use slice_group_by::StrGroupBy;
use structopt::StructOpt;
use milli::{FastMap4, SmallVec32, Index, DocumentId, Position};
use milli::{SmallVec32, Index, DocumentId, Position};
const LMDB_MAX_KEY_LENGTH: usize = 512;
const ONE_MILLION: usize = 1_000_000;
@ -26,6 +28,9 @@ const ONE_MILLION: usize = 1_000_000;
const MAX_POSITION: usize = 1000;
const MAX_ATTRIBUTES: usize = u32::max_value() as usize / MAX_POSITION;
const HEADERS_KEY: &[u8] = b"\0headers";
const WORDS_FST_KEY: &[u8] = b"\x06words-fst";
#[cfg(target_os = "linux")]
#[global_allocator]
static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
@ -47,14 +52,6 @@ struct Opt {
#[structopt(short, long)]
jobs: Option<usize>,
/// Maximum number of bytes to allocate, will be divided by the number of
/// cores used. It is recommended to set a maximum of half of the available memory
/// as the current measurement method is really bad.
///
/// The minumum amount of memory used will be 50MB anyway.
#[structopt(long, default_value = "4294967296")]
max_memory_usage: usize,
/// Verbose mode (-v, -vv, -vvv, etc.)
#[structopt(short, long, parse(from_occurrences))]
verbose: usize,
@ -63,285 +60,178 @@ struct Opt {
csv_file: Option<PathBuf>,
}
struct Indexed {
fst: fst::Set<Vec<u8>>,
word_positions: FastMap4<SmallVec32<u8>, RoaringBitmap>,
word_position_docids: FastMap4<(SmallVec32<u8>, Position), RoaringBitmap>,
headers: Vec<u8>,
documents: Vec<(DocumentId, Vec<u8>)>,
type MergeFn = fn(&[u8], &[Vec<u8>]) -> Result<Vec<u8>, ()>;
struct Store {
word_positions: ArcCache<SmallVec32<u8>, RoaringBitmap>,
word_position_docids: ArcCache<(SmallVec32<u8>, Position), RoaringBitmap>,
sorter: Sorter<MergeFn>,
}
impl Indexed {
fn new(
word_positions: FastMap4<SmallVec32<u8>, RoaringBitmap>,
word_position_docids: FastMap4<(SmallVec32<u8>, Position), RoaringBitmap>,
headers: Vec<u8>,
documents: Vec<(DocumentId, Vec<u8>)>,
) -> anyhow::Result<Indexed>
{
// We store the words from the postings.
let new_words: BTreeSet<_> = word_position_docids.iter().map(|((w, _), _)| w).collect();
let fst = fst::Set::from_iter(new_words)?;
Ok(Indexed { fst, headers, word_positions, word_position_docids, documents })
impl Store {
fn new() -> Store {
let sorter = Sorter::builder(merge as MergeFn)
.chunk_compression_type(CompressionType::Snappy)
.build();
Store {
word_positions: ArcCache::new(65_535),
word_position_docids: ArcCache::new(65_535),
sorter,
}
}
}
#[derive(Default)]
struct MtblKvStore(Option<File>);
// Save the positions where this word has been seen.
pub fn insert_word_position(&mut self, word: &str, position: Position) -> anyhow::Result<()> {
let word = SmallVec32::from(word.as_bytes());
let position = RoaringBitmap::from_iter(Some(position));
let (_, lrus) = self.word_positions.insert(word, position, |old, new| old.union_with(&new));
Self::write_word_positions(&mut self.sorter, lrus)
}
impl MtblKvStore {
fn from_indexed(mut indexed: Indexed) -> anyhow::Result<MtblKvStore> {
debug!("Creating an MTBL store from an Indexed...");
// Save the documents ids under the position and word we have seen it.
pub fn insert_word_position_docid(&mut self, word: &str, position: Position, id: DocumentId) -> anyhow::Result<()> {
let word = SmallVec32::from(word.as_bytes());
let ids = RoaringBitmap::from_iter(Some(id));
let (_, lrus) = self.word_position_docids.insert((word, position), ids, |old, new| old.union_with(&new));
Self::write_word_position_docids(&mut self.sorter, lrus)
}
let outfile = tempfile::tempfile()?;
let mut out = Writer::new(outfile, None)?;
pub fn write_headers(&mut self, headers: &[u8]) -> anyhow::Result<()> {
Ok(self.sorter.insert(HEADERS_KEY, headers)?)
}
out.add(b"\0headers", indexed.headers)?;
out.add(b"\0words-fst", indexed.fst.as_fst().as_bytes())?;
pub fn write_document(&mut self, id: DocumentId, content: &[u8]) -> anyhow::Result<()> {
let id = id.to_be_bytes();
let mut key = Vec::with_capacity(1 + id.len());
// postings ids keys are all prefixed by a '5'
key.push(5);
key.extend_from_slice(&id);
Ok(self.sorter.insert(&key, content)?)
}
fn write_word_positions<I>(sorter: &mut Sorter<MergeFn>, iter: I) -> anyhow::Result<()>
where I: IntoIterator<Item=(SmallVec32<u8>, RoaringBitmap)>
{
// postings ids keys are all prefixed by a '1'
let mut key = vec![0];
let mut key = vec![1];
let mut buffer = Vec::new();
// We must write the postings attrs
key[0] = 1;
// We must write the postings ids in order for mtbl therefore
// we iterate over the fst to read the words in order
let mut stream = indexed.fst.stream();
while let Some(word) = stream.next() {
if let Some(positions) = indexed.word_positions.get(word) {
key.truncate(1);
key.extend_from_slice(word);
// We serialize the positions into a buffer
buffer.clear();
positions.serialize_into(&mut buffer)?;
// that we write under the generated key into MTBL
out.add(&key, &buffer).unwrap();
}
}
// We must write the postings ids
key[0] = 3;
// We must write the postings ids in order for mtbl therefore
// we iterate over the fst to read the words in order
let mut stream = indexed.fst.stream();
while let Some(word) = stream.next() {
for (word, positions) in iter {
key.truncate(1);
key.extend_from_slice(word);
if let Some(positions) = indexed.word_positions.remove(word) {
// We iterate over all the attributes containing the documents ids
for pos in positions {
let ids = indexed.word_position_docids.remove(&(SmallVec32::from(word), pos)).unwrap();
// we postfix the word by the positions it appears in
let position_bytes = pos.to_be_bytes();
key.extend_from_slice(&position_bytes);
// We serialize the document ids into a buffer
buffer.clear();
ids.serialize_into(&mut buffer)?;
// that we write under the generated key into MTBL
out.add(&key, &buffer).unwrap();
// And cleanup the position afterward
key.truncate(key.len() - position_bytes.len());
}
}
key.extend_from_slice(&word);
// We serialize the positions into a buffer
buffer.clear();
positions.serialize_into(&mut buffer)?;
// that we write under the generated key into MTBL
sorter.insert(&key, &buffer)?;
}
// postings ids keys are all prefixed
key[0] = 5;
indexed.documents.sort_unstable_by_key(|(id, _)| *id);
for (id, content) in indexed.documents {
key.truncate(1);
key.extend_from_slice(&id.to_be_bytes());
out.add(&key, content).unwrap();
}
let out = out.into_inner()?;
debug!("MTBL store created!");
Ok(MtblKvStore(Some(out)))
}
fn merge(key: &[u8], values: &[Vec<u8>]) -> Option<Vec<u8>> {
if key == b"\0words-fst" {
let fsts: Vec<_> = values.iter().map(|v| fst::Set::new(v).unwrap()).collect();
// Union of the two FSTs
let mut op = fst::set::OpBuilder::new();
fsts.iter().for_each(|fst| op.push(fst.into_stream()));
let op = op.r#union();
let mut build = fst::SetBuilder::memory();
build.extend_stream(op.into_stream()).unwrap();
Some(build.into_inner().unwrap())
}
else if key == b"\0headers" {
assert!(values.windows(2).all(|vs| vs[0] == vs[1]));
Some(values[0].to_vec())
}
// We either merge postings attrs, prefix postings or postings ids.
else if key[0] == 1 || key[0] == 2 || key[0] == 3 || key[0] == 4 {
let mut first = RoaringBitmap::deserialize_from(values[0].as_slice()).unwrap();
for value in &values[1..] {
let bitmap = RoaringBitmap::deserialize_from(value.as_slice()).unwrap();
first.union_with(&bitmap);
}
let mut vec = Vec::new();
first.serialize_into(&mut vec).unwrap();
Some(vec)
}
else if key[0] == 5 {
assert!(values.windows(2).all(|vs| vs[0] == vs[1]));
Some(values[0].to_vec())
}
else {
panic!("wut? {:?}", key)
}
}
fn from_many<F>(stores: Vec<MtblKvStore>, mut f: F) -> anyhow::Result<()>
where F: FnMut(&[u8], &[u8]) -> anyhow::Result<()>
{
debug!("Merging {} MTBL stores...", stores.len());
let before = Instant::now();
let mmaps: Vec<_> = stores.iter().flat_map(|m| {
m.0.as_ref().map(|f| unsafe { memmap::Mmap::map(f).unwrap() })
}).collect();
let sources = mmaps.iter().map(|mmap| {
Reader::new(&mmap, ReaderOptions::default()).unwrap()
}).collect();
let opt = MergerOptions { merge: MtblKvStore::merge };
let mut merger = Merger::new(sources, opt);
let mut iter = merger.iter();
while let Some((k, v)) = iter.next() {
(f)(k, v)?;
}
debug!("MTBL stores merged in {:.02?}!", before.elapsed());
Ok(())
}
}
fn mem_usage(
word_positions: &FastMap4<SmallVec32<u8>, RoaringBitmap>,
word_position_docids: &FastMap4<(SmallVec32<u8>, Position), RoaringBitmap>,
documents: &Vec<(u32, Vec<u8>)>,
) -> usize
{
use std::mem::size_of;
fn write_word_position_docids<I>(sorter: &mut Sorter<MergeFn>, iter: I) -> anyhow::Result<()>
where I: IntoIterator<Item=((SmallVec32<u8>, Position), RoaringBitmap)>
{
// postings positions ids keys are all prefixed by a '3'
let mut key = vec![3];
let mut buffer = Vec::new();
let documents =
documents.iter().map(|(_, d)| d.capacity()).sum::<usize>()
+ documents.capacity() * size_of::<(Position, Vec<u8>)>();
let word_positions =
word_positions.iter().map(|(k, r)| {
(if k.spilled() { k.capacity() } else { 0 }) + r.mem_usage()
}).sum::<usize>()
+ word_positions.capacity() * size_of::<(SmallVec32<u8>, RoaringBitmap)>();
let word_position_docids =
word_position_docids.iter().map(|((k, _), r)| {
(if k.spilled() { k.capacity() } else { 0 }) + r.mem_usage()
}).sum::<usize>()
+ word_position_docids.capacity() * size_of::<((SmallVec32<u8>, Position), RoaringBitmap)>();
documents + word_positions + word_position_docids
}
fn index_csv(
mut rdr: csv::Reader<File>,
thread_index: usize,
num_threads: usize,
max_mem_usage: usize,
) -> anyhow::Result<Vec<MtblKvStore>>
{
debug!("{:?}: Indexing into an Indexed...", thread_index);
let mut stores = Vec::new();
let mut word_positions = FastMap4::default();
let mut word_position_docids = FastMap4::default();
let mut documents = Vec::new();
// Write the headers into a Vec of bytes.
let headers = rdr.headers()?;
let mut writer = csv::WriterBuilder::new().has_headers(false).from_writer(Vec::new());
writer.write_byte_record(headers.as_byte_record())?;
let headers = writer.into_inner()?;
let mut document_id: usize = 0;
let mut document = csv::StringRecord::new();
while rdr.read_record(&mut document)? {
document_id = document_id + 1;
// We skip documents that must not be indexed by this thread
if document_id % num_threads != thread_index { continue }
let document_id = DocumentId::try_from(document_id).context("generated id is too big")?;
if document_id % (ONE_MILLION as u32) == 0 {
debug!("We have seen {}m documents so far.", document_id / ONE_MILLION as u32);
for ((word, pos), ids) in iter {
key.truncate(1);
key.extend_from_slice(&word);
// we postfix the word by the positions it appears in
let position_bytes = pos.to_be_bytes();
key.extend_from_slice(&position_bytes);
// We serialize the document ids into a buffer
buffer.clear();
ids.serialize_into(&mut buffer)?;
// that we write under the generated key into MTBL
sorter.insert(&key, &buffer)?;
// And cleanup the position afterward
key.truncate(key.len() - position_bytes.len());
}
for (attr, content) in document.iter().enumerate().take(MAX_ATTRIBUTES) {
for (pos, word) in simple_alphanumeric_tokens(&content).enumerate().take(MAX_POSITION) {
if !word.is_empty() && word.len() < LMDB_MAX_KEY_LENGTH {
let word = word.cow_to_lowercase();
let position = (attr * MAX_POSITION + pos) as u32;
// We save the positions where this word has been seen.
word_positions.entry(SmallVec32::from(word.as_bytes()))
.or_insert_with(RoaringBitmap::new).insert(position);
// We save the documents ids under the position and word we have seen it.
word_position_docids.entry((SmallVec32::from(word.as_bytes()), position)) // word + position
.or_insert_with(RoaringBitmap::new).insert(document_id); // document ids
}
}
}
// We write the document in the database.
let mut writer = csv::WriterBuilder::new().has_headers(false).from_writer(Vec::new());
writer.write_byte_record(document.as_byte_record())?;
let document = writer.into_inner()?;
documents.push((document_id, document));
if documents.len() % 100_000 == 0 {
let usage = mem_usage(&word_positions, &word_position_docids, &documents);
if usage > max_mem_usage {
debug!("Whoops too much memory used ({}B).", usage);
let word_positions = mem::take(&mut word_positions);
let word_position_docids = mem::take(&mut word_position_docids);
let documents = mem::take(&mut documents);
let indexed = Indexed::new(word_positions, word_position_docids, headers.clone(), documents)?;
debug!("{:?}: Indexed created!", thread_index);
stores.push(MtblKvStore::from_indexed(indexed)?);
}
}
Ok(())
}
let indexed = Indexed::new(word_positions, word_position_docids, headers, documents)?;
debug!("{:?}: Indexed created!", thread_index);
stores.push(MtblKvStore::from_indexed(indexed)?);
pub fn finish(mut self) -> anyhow::Result<Reader<Mmap>> {
Self::write_word_positions(&mut self.sorter, self.word_positions)?;
Self::write_word_position_docids(&mut self.sorter, self.word_position_docids)?;
Ok(stores)
let mut wtr = tempfile::tempfile().map(Writer::new)?;
let mut builder = fst::SetBuilder::memory();
let mut iter = self.sorter.into_iter()?;
while let Some(result) = iter.next() {
let (key, val) = result?;
if let Some((&1, word)) = key.split_first() {
// This is a lexicographically ordered word position
// we use the key to construct the words fst.
builder.insert(word)?;
}
wtr.insert(key, val)?;
}
let fst = builder.into_set();
wtr.insert(WORDS_FST_KEY, fst.as_fst().as_bytes())?;
let file = wtr.into_inner()?;
let mmap = unsafe { Mmap::map(&file)? };
let reader = Reader::new(mmap)?;
Ok(reader)
}
}
fn merge(key: &[u8], values: &[Vec<u8>]) -> Result<Vec<u8>, ()> {
if key == WORDS_FST_KEY {
let fsts: Vec<_> = values.iter().map(|v| fst::Set::new(v).unwrap()).collect();
// Union of the two FSTs
let mut op = fst::set::OpBuilder::new();
fsts.iter().for_each(|fst| op.push(fst.into_stream()));
let op = op.r#union();
let mut build = fst::SetBuilder::memory();
build.extend_stream(op.into_stream()).unwrap();
Ok(build.into_inner().unwrap())
}
else if key == HEADERS_KEY {
assert!(values.windows(2).all(|vs| vs[0] == vs[1]));
Ok(values[0].to_vec())
}
// We either merge postings attrs, prefix postings or postings ids.
else if key[0] == 1 || key[0] == 2 || key[0] == 3 || key[0] == 4 {
let mut first = RoaringBitmap::deserialize_from(values[0].as_slice()).unwrap();
for value in &values[1..] {
let bitmap = RoaringBitmap::deserialize_from(value.as_slice()).unwrap();
first.union_with(&bitmap);
}
let mut vec = Vec::new();
first.serialize_into(&mut vec).unwrap();
Ok(vec)
}
else if key[0] == 5 {
assert!(values.windows(2).all(|vs| vs[0] == vs[1]));
Ok(values[0].to_vec())
}
else {
panic!("wut? {:?}", key)
}
}
// TODO merge with the previous values
fn writer(wtxn: &mut heed::RwTxn, index: &Index, key: &[u8], val: &[u8]) -> anyhow::Result<()> {
if key == b"\0words-fst" {
fn lmdb_writer(wtxn: &mut heed::RwTxn, index: &Index, key: &[u8], val: &[u8]) -> anyhow::Result<()> {
if key == WORDS_FST_KEY {
// Write the words fst
index.main.put::<_, Str, ByteSlice>(wtxn, "words-fst", val)?;
}
else if key == b"\0headers" {
else if key == HEADERS_KEY {
// Write the headers
index.main.put::<_, Str, ByteSlice>(wtxn, "headers", val)?;
}
@ -374,6 +264,81 @@ fn writer(wtxn: &mut heed::RwTxn, index: &Index, key: &[u8], val: &[u8]) -> anyh
Ok(())
}
fn merge_into_lmdb<F>(sources: Vec<Reader<Mmap>>, mut f: F) -> anyhow::Result<()>
where F: FnMut(&[u8], &[u8]) -> anyhow::Result<()>
{
debug!("Merging {} MTBL stores...", sources.len());
let before = Instant::now();
let mut builder = Merger::builder(merge);
builder.extend(sources);
let merger = builder.build();
let mut iter = merger.into_merge_iter()?;
while let Some(result) = iter.next() {
let (k, v) = result?;
(f)(&k, &v)?;
}
debug!("MTBL stores merged in {:.02?}!", before.elapsed());
Ok(())
}
fn index_csv(
mut rdr: csv::Reader<File>,
thread_index: usize,
num_threads: usize,
) -> anyhow::Result<Reader<Mmap>>
{
debug!("{:?}: Indexing into an Indexed...", thread_index);
let mut store = Store::new();
// Write the headers into a Vec of bytes and then into the store.
let headers = rdr.headers()?;
let mut writer = csv::WriterBuilder::new().has_headers(false).from_writer(Vec::new());
writer.write_byte_record(headers.as_byte_record())?;
let headers = writer.into_inner()?;
store.write_headers(&headers)?;
let mut document_id: usize = 0;
let mut document = csv::StringRecord::new();
while rdr.read_record(&mut document)? {
document_id = document_id + 1;
// We skip documents that must not be indexed by this thread
if document_id % num_threads != thread_index { continue }
let document_id = DocumentId::try_from(document_id).context("generated id is too big")?;
if document_id % (ONE_MILLION as u32) == 0 {
debug!("We have seen {}m documents so far.", document_id / ONE_MILLION as u32);
}
for (attr, content) in document.iter().enumerate().take(MAX_ATTRIBUTES) {
for (pos, word) in simple_alphanumeric_tokens(&content).enumerate().take(MAX_POSITION) {
if !word.is_empty() && word.len() < LMDB_MAX_KEY_LENGTH {
let word = word.cow_to_lowercase();
let position = (attr * MAX_POSITION + pos) as u32;
store.insert_word_position(&word, position)?;
store.insert_word_position_docid(&word, position, document_id)?;
}
}
}
// We write the document in the database.
let mut writer = csv::WriterBuilder::new().has_headers(false).from_writer(Vec::new());
writer.write_byte_record(document.as_byte_record())?;
let document = writer.into_inner()?;
store.write_document(document_id, &document)?;
}
let reader = store.finish()?;
debug!("{:?}: Store created!", thread_index);
Ok(reader)
}
// TODO do that in the threads.
fn compute_words_attributes_docids(wtxn: &mut heed::RwTxn, index: &Index) -> anyhow::Result<()> {
let before = Instant::now();
@ -441,7 +406,6 @@ fn main() -> anyhow::Result<()> {
let index = Index::new(&env)?;
let num_threads = rayon::current_num_threads();
let max_memory_usage = (opt.max_memory_usage / num_threads).max(50 * 1024 * 1024); // 50MB
// We duplicate the file # jobs times.
let file = opt.csv_file.unwrap();
@ -450,15 +414,13 @@ fn main() -> anyhow::Result<()> {
let stores: Vec<_> = csv_readers
.into_par_iter()
.enumerate()
.map(|(i, rdr)| index_csv(rdr, i, num_threads, max_memory_usage))
.map(|(i, rdr)| index_csv(rdr, i, num_threads))
.collect::<Result<_, _>>()?;
let stores: Vec<_> = stores.into_iter().flatten().collect();
debug!("We are writing into LMDB...");
let mut wtxn = env.write_txn()?;
MtblKvStore::from_many(stores, |k, v| writer(&mut wtxn, &index, k, v))?;
merge_into_lmdb(stores, |k, v| lmdb_writer(&mut wtxn, &index, k, v))?;
compute_words_attributes_docids(&mut wtxn, &index)?;
let count = index.documents.len(&wtxn)?;