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First basic version using MTBL again

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Kerollmops 2020-07-07 11:32:33 +02:00
parent 45d0d7c3d4
commit 7178b6c2c4
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GPG Key ID: 92ADA4E935E71FA4
5 changed files with 364 additions and 865 deletions
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117
Cargo.lock generated
View File

@ -1,5 +1,11 @@
# This file is automatically @generated by Cargo. # This file is automatically @generated by Cargo.
# It is not intended for manual editing. # It is not intended for manual editing.
[[package]]
name = "adler"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ccc9a9dd069569f212bc4330af9f17c4afb5e8ce185e83dbb14f1349dda18b10"
[[package]] [[package]]
name = "anyhow" name = "anyhow"
version = "1.0.31" version = "1.0.31"
@ -153,6 +159,9 @@ name = "cc"
version = "1.0.54" version = "1.0.54"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7bbb73db36c1246e9034e307d0fba23f9a2e251faa47ade70c1bd252220c8311" checksum = "7bbb73db36c1246e9034e307d0fba23f9a2e251faa47ade70c1bd252220c8311"
dependencies = [
"jobserver",
]
[[package]] [[package]]
name = "cfg-if" name = "cfg-if"
@ -186,6 +195,21 @@ version = "0.1.2"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "79bb3adfaf5f75d24b01aee375f7555907840fa2800e5ec8fa3b9e2031830173" checksum = "79bb3adfaf5f75d24b01aee375f7555907840fa2800e5ec8fa3b9e2031830173"
[[package]]
name = "crc32c"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "77ba37ef26c12988c1cee882d522d65e1d5d2ad8c3864665b88ee92767ed84c5"
[[package]]
name = "crc32fast"
version = "1.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ba125de2af0df55319f41944744ad91c71113bf74a4646efff39afe1f6842db1"
dependencies = [
"cfg-if",
]
[[package]] [[package]]
name = "criterion" name = "criterion"
version = "0.3.2" version = "0.3.2"
@ -323,6 +347,18 @@ version = "0.1.2"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed" checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
[[package]]
name = "flate2"
version = "1.0.16"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "68c90b0fc46cf89d227cc78b40e494ff81287a92dd07631e5af0d06fe3cf885e"
dependencies = [
"cfg-if",
"crc32fast",
"libc",
"miniz_oxide",
]
[[package]] [[package]]
name = "fnv" name = "fnv"
version = "1.0.7" version = "1.0.7"
@ -487,6 +523,12 @@ dependencies = [
"wasi", "wasi",
] ]
[[package]]
name = "glob"
version = "0.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
[[package]] [[package]]
name = "h2" name = "h2"
version = "0.2.5" version = "0.2.5"
@ -710,6 +752,15 @@ dependencies = [
"libc", "libc",
] ]
[[package]]
name = "jobserver"
version = "0.1.21"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5c71313ebb9439f74b00d9d2dcec36440beaf57a6aa0623068441dd7cd81a7f2"
dependencies = [
"libc",
]
[[package]] [[package]]
name = "js-sys" name = "js-sys"
version = "0.3.40" version = "0.3.40"
@ -750,12 +801,6 @@ version = "0.2.70"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3baa92041a6fec78c687fa0cc2b3fae8884f743d672cf551bed1d6dac6988d0f" checksum = "3baa92041a6fec78c687fa0cc2b3fae8884f743d672cf551bed1d6dac6988d0f"
[[package]]
name = "linked-hash-map"
version = "0.5.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8dd5a6d5999d9907cda8ed67bbd137d3af8085216c2ac62de5be860bd41f304a"
[[package]] [[package]]
name = "lmdb-rkv-sys" name = "lmdb-rkv-sys"
version = "0.11.0" version = "0.11.0"
@ -814,9 +859,9 @@ dependencies = [
"itertools", "itertools",
"jemallocator", "jemallocator",
"levenshtein_automata", "levenshtein_automata",
"linked-hash-map",
"memmap", "memmap",
"once_cell", "once_cell",
"oxidized-mtbl",
"rayon", "rayon",
"roaring", "roaring",
"serde", "serde",
@ -891,6 +936,15 @@ dependencies = [
"unicase 2.6.0", "unicase 2.6.0",
] ]
[[package]]
name = "miniz_oxide"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "be0f75932c1f6cfae3c04000e40114adf955636e19040f9c0a2c380702aa1c7f"
dependencies = [
"adler",
]
[[package]] [[package]]
name = "mio" name = "mio"
version = "0.6.22" version = "0.6.22"
@ -1021,6 +1075,18 @@ version = "0.2.3"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2839e79665f131bdb5782e51f2c6c9599c133c6098982a54c794358bf432529c" checksum = "2839e79665f131bdb5782e51f2c6c9599c133c6098982a54c794358bf432529c"
[[package]]
name = "oxidized-mtbl"
version = "0.1.0"
source = "git+https://github.com/Kerollmops/oxidized-mtbl.git?rev=9451be8#9451be8829562f7d1f8d34aa3ecb81c5106a0623"
dependencies = [
"byteorder",
"crc32c",
"flate2",
"snap",
"zstd",
]
[[package]] [[package]]
name = "page_size" name = "page_size"
version = "0.4.2" version = "0.4.2"
@ -1577,6 +1643,12 @@ version = "1.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c7cb5678e1615754284ec264d9bb5b4c27d2018577fd90ac0ceb578591ed5ee4" checksum = "c7cb5678e1615754284ec264d9bb5b4c27d2018577fd90ac0ceb578591ed5ee4"
[[package]]
name = "snap"
version = "1.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "da73c8f77aebc0e40c300b93f0a5f1bece7a248a36eee287d4e095f35c7b7d6e"
[[package]] [[package]]
name = "socket2" name = "socket2"
version = "0.3.12" version = "0.3.12"
@ -2077,3 +2149,34 @@ dependencies = [
"syn", "syn",
"synstructure", "synstructure",
] ]
[[package]]
name = "zstd"
version = "0.5.3+zstd.1.4.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "01b32eaf771efa709e8308605bbf9319bf485dc1503179ec0469b611937c0cd8"
dependencies = [
"zstd-safe",
]
[[package]]
name = "zstd-safe"
version = "2.0.5+zstd.1.4.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1cfb642e0d27f64729a639c52db457e0ae906e7bc6f5fe8f5c453230400f1055"
dependencies = [
"libc",
"zstd-sys",
]
[[package]]
name = "zstd-sys"
version = "1.4.17+zstd.1.4.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b89249644df056b522696b1bb9e7c18c87e8ffa3e2f0dc3b0155875d6498f01b"
dependencies = [
"cc",
"glob",
"itertools",
"libc",
]

2
Cargo.toml
View File

@ -16,9 +16,9 @@ fxhash = "0.2.1"
heed = { version = "0.8.1", default-features = false, features = ["lmdb"] } heed = { version = "0.8.1", default-features = false, features = ["lmdb"] }
jemallocator = "0.3.2" jemallocator = "0.3.2"
levenshtein_automata = { version = "0.2.0", features = ["fst_automaton"] } levenshtein_automata = { version = "0.2.0", features = ["fst_automaton"] }
linked-hash-map = "0.5.3"
memmap = "0.7.0" memmap = "0.7.0"
once_cell = "1.4.0" once_cell = "1.4.0"
oxidized-mtbl = { git = "https://github.com/Kerollmops/oxidized-mtbl.git", rev = "9451be8" }
rayon = "1.3.1" rayon = "1.3.1"
roaring = { git = "https://github.com/Kerollmops/roaring-rs.git", branch = "deserialize-from-slice" } roaring = { git = "https://github.com/Kerollmops/roaring-rs.git", branch = "deserialize-from-slice" }
slice-group-by = "0.2.6" slice-group-by = "0.2.6"

619
src/bin/indexer.rs
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@ -1,26 +1,25 @@
use std::collections::hash_map::Entry; use std::collections::hash_map::Entry;
use std::collections::{HashMap, BTreeSet}; use std::collections::{HashMap, BTreeSet, BTreeMap};
use std::convert::{TryFrom, TryInto}; use std::convert::{TryFrom, TryInto};
use std::hash::{Hash, BuildHasher}; use std::fs::File;
use std::io; use std::path::PathBuf;
use std::iter::FromIterator;
use std::path::{Path, PathBuf};
use std::time::Instant; use std::time::Instant;
use anyhow::{ensure, Context}; use anyhow::Context;
use fst::{Streamer, set::OpBuilder}; use cow_utils::CowUtils;
use fst::{Streamer, IntoStreamer};
use heed::EnvOpenOptions;
use heed::types::*; use heed::types::*;
use heed::{Env, EnvOpenOptions}; use oxidized_mtbl::{Reader, ReaderOptions, Writer, Merger, MergerOptions};
use rayon::prelude::*;
use roaring::RoaringBitmap; use roaring::RoaringBitmap;
use slice_group_by::StrGroupBy; use slice_group_by::StrGroupBy;
use structopt::StructOpt; use structopt::StructOpt;
use tempfile::TempDir;
use mega_mini_indexer::cache::ArcCache; use mega_mini_indexer::{FastMap4, SmallVec32, Index, DocumentId, AttributeId};
use mega_mini_indexer::{BEU32, Index, DocumentId, FastMap4};
const LMDB_MAX_KEY_LENGTH: usize = 512;
const ONE_MILLION: usize = 1_000_000;
const ONE_MILLION: u32 = 1_000_000;
const MAX_POSITION: usize = 1000; const MAX_POSITION: usize = 1000;
const MAX_ATTRIBUTES: usize = u32::max_value() as usize / MAX_POSITION; const MAX_ATTRIBUTES: usize = u32::max_value() as usize / MAX_POSITION;
@ -41,64 +40,173 @@ struct Opt {
#[structopt(long = "db", parse(from_os_str))] #[structopt(long = "db", parse(from_os_str))]
database: PathBuf, database: PathBuf,
/// The number of words that can fit in cache, the bigger this number is the less
/// the indexer will touch the databases on disk but the more it uses memory.
#[structopt(long, default_value = "100000")]
arc_cache_size: usize,
/// Number of parallel jobs, defaults to # of CPUs. /// Number of parallel jobs, defaults to # of CPUs.
#[structopt(short, long)] #[structopt(short, long)]
jobs: Option<usize>, jobs: Option<usize>,
/// CSV file to index. /// CSV file to index, if unspecified the CSV is read from standard input.
csv_file: PathBuf, csv_file: Option<PathBuf>,
} }
fn put_evicted_into_heed<I>(wtxn: &mut heed::RwTxn, index: &Index, iter: I) -> anyhow::Result<()> struct Indexed {
where fst: fst::Set<Vec<u8>>,
I: IntoIterator<Item = (String, (RoaringBitmap, FastMap4<u32, RoaringBitmap>))> postings_attrs: FastMap4<SmallVec32<u8>, RoaringBitmap>,
postings_ids: FastMap4<SmallVec32<u8>, FastMap4<AttributeId, RoaringBitmap>>,
headers: Vec<u8>,
documents: Vec<(DocumentId, Vec<u8>)>,
}
#[derive(Default)]
struct MtblKvStore(Option<File>);
impl MtblKvStore {
fn from_indexed(mut indexed: Indexed) -> anyhow::Result<MtblKvStore> {
eprintln!("Creating an MTBL store from an Indexed...");
let outfile = tempfile::tempfile()?;
let mut out = Writer::new(outfile, None)?;
out.add(b"\0headers", indexed.headers)?;
out.add(b"\0words-fst", indexed.fst.as_fst().as_bytes())?;
// postings ids keys are all prefixed by a '1'
let mut key = vec![0];
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(attrs) = indexed.postings_attrs.remove(word) {
key.truncate(1);
key.extend_from_slice(word);
// We serialize the attrs ids into a buffer
buffer.clear();
attrs.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() {
key.truncate(1);
key.extend_from_slice(word);
if let Some(attrs) = indexed.postings_ids.remove(word) {
let attrs: BTreeMap<_, _> = attrs.into_iter().collect();
// We iterate over all the attributes containing the documents ids
for (attr, ids) in attrs {
// we postfix the word by the attribute id
key.extend_from_slice(&attr.to_be_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 attribute id afterward (u32 = 4 * u8)
key.truncate(key.len() - 4);
}
}
}
// postings ids keys are all prefixed by a '4'
key[0] = 5;
indexed.documents.sort_unstable();
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()?;
eprintln!("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<()>
{ {
for (word, (positions, positions_docids)) in iter { eprintln!("Merging {} MTBL stores...", stores.len());
index.word_positions.put(wtxn, &word, &positions)?;
for (position, docids) in positions_docids { let mmaps: Vec<_> = stores.iter().flat_map(|m| {
let mut key = word.as_bytes().to_vec(); m.0.as_ref().map(|f| unsafe { memmap::Mmap::map(f).unwrap() })
key.extend_from_slice(&position.to_be_bytes()); }).collect();
index.word_position_docids.put(wtxn, &key, &docids)?;
} 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)?;
} }
eprintln!("MTBL stores merged!");
Ok(()) Ok(())
} }
fn merge_hashmaps<K, V, S, F>(mut a: HashMap<K, V, S>, mut b: HashMap<K, V, S>, mut merge: F) -> HashMap<K, V, S>
where
K: Hash + Eq,
S: BuildHasher,
F: FnMut(&K, &mut V, V)
{
for (k, v) in a.iter_mut() {
if let Some(vb) = b.remove(k) {
(merge)(k, v, vb)
}
} }
a.extend(b); fn index_csv(
mut rdr: csv::Reader<File>,
a
}
fn index_csv<R: io::Read>(
wtxn: &mut heed::RwTxn,
mut rdr: csv::Reader<R>,
index: &Index,
arc_cache_size: usize,
num_threads: usize,
thread_index: usize, thread_index: usize,
) -> anyhow::Result<()> num_threads: usize,
) -> anyhow::Result<Vec<MtblKvStore>>
{ {
eprintln!("Indexing into LMDB..."); eprintln!("{:?}: Indexing into an Indexed...", thread_index);
let mut words_cache = ArcCache::<_, (RoaringBitmap, FastMap4<_, RoaringBitmap>)>::new(arc_cache_size); let mut document = csv::StringRecord::new();
let mut postings_attrs = FastMap4::default();
let mut postings_ids = FastMap4::default();
let mut documents = Vec::new();
// Write the headers into a Vec of bytes. // Write the headers into a Vec of bytes.
let headers = rdr.headers()?; let headers = rdr.headers()?;
@ -106,92 +214,102 @@ fn index_csv<R: io::Read>(
writer.write_byte_record(headers.as_byte_record())?; writer.write_byte_record(headers.as_byte_record())?;
let headers = writer.into_inner()?; let headers = writer.into_inner()?;
let mut document_id = 0usize; let mut document_id: usize = 0;
let mut before = Instant::now();
let mut document = csv::StringRecord::new();
while rdr.read_record(&mut document)? { while rdr.read_record(&mut document)? {
document_id = document_id + 1; document_id = document_id + 1;
let document_id = DocumentId::try_from(document_id).context("Generated id is too big")?;
if thread_index == 0 && document_id % ONE_MILLION == 0 { // We skip documents that must not be indexed by this thread
eprintln!("Document {}m just processed ({:.02?} elapsed).", document_id / ONE_MILLION, before.elapsed()); if document_id % num_threads != thread_index { continue }
before = Instant::now();
let document_id = DocumentId::try_from(document_id).context("generated id is too big")?;
if document_id % (ONE_MILLION as u32) == 0 {
eprintln!("We have seen {}m documents so far.", document_id / ONE_MILLION as u32);
} }
for (attr, content) in document.iter().enumerate().take(MAX_ATTRIBUTES) { for (attr, content) in document.iter().enumerate().take(MAX_ATTRIBUTES) {
for (pos, word) in simple_alphanumeric_tokens(&content).enumerate().take(MAX_POSITION) { for (pos, word) in simple_alphanumeric_tokens(&content).enumerate().take(MAX_POSITION) {
if !word.is_empty() && word.len() < 500 { // LMDB limits if !word.is_empty() && word.len() < LMDB_MAX_KEY_LENGTH {
let word = word.to_lowercase(); // TODO cow_to_lowercase let word = word.cow_to_lowercase();
let position = (attr * 1000 + pos) as u32; let position = (attr * MAX_POSITION + pos) as u32;
// If this indexing process is not concerned by this word, then ignore it. // We save the positions where this word has been seen.
if fxhash::hash32(&word) as usize % num_threads != thread_index { continue; } postings_attrs.entry(SmallVec32::from(word.as_bytes()))
.or_insert_with(RoaringBitmap::new).insert(position);
match words_cache.get_mut(&word) { // We save the documents ids under the position and word we have seen it.
(Some(entry), evicted) => { postings_ids.entry(SmallVec32::from(word.as_bytes()))
let (ids, positions) = entry; .or_insert_with(FastMap4::default).entry(position) // positions
ids.insert(position); .or_insert_with(RoaringBitmap::new).insert(document_id); // document ids
positions.entry(position).or_default().insert(document_id);
put_evicted_into_heed(wtxn, index, evicted)?;
},
(None, _evicted) => {
let mut key = word.as_bytes().to_vec();
key.extend_from_slice(&position.to_be_bytes());
let mut words_positions = index.word_positions.get(wtxn, &word)?.unwrap_or_default();
let mut words_position_docids = index.word_position_docids.get(wtxn, &key)?.unwrap_or_default();
words_positions.insert(position);
words_position_docids.insert(document_id);
let mut map = FastMap4::default();
map.insert(position, words_position_docids);
let value = (words_positions, map);
let evicted = words_cache.insert(word.clone(), value, |(pa, pda), (pb, pdb)| {
(pa | pb, merge_hashmaps(pda, pdb, |_, a, b| RoaringBitmap::union_with(a, &b)))
});
put_evicted_into_heed(wtxn, index, evicted)?;
}
}
} }
} }
} }
if document_id as usize % num_threads == thread_index {
// We write the document in the database. // We write the document in the database.
let mut writer = csv::WriterBuilder::new().has_headers(false).from_writer(Vec::new()); let mut writer = csv::WriterBuilder::new().has_headers(false).from_writer(Vec::new());
writer.write_byte_record(document.as_byte_record())?; writer.write_byte_record(document.as_byte_record())?;
let document = writer.into_inner()?; let document = writer.into_inner()?;
index.documents.put(wtxn, &BEU32::new(document_id), &document)?; documents.push((document_id, document));
} }
}
put_evicted_into_heed(wtxn, index, words_cache)?;
// We store the words from the postings. // We store the words from the postings.
let mut new_words = BTreeSet::default(); let mut new_words = BTreeSet::default();
let iter = index.word_positions.as_polymorph().iter::<_, Str, DecodeIgnore>(wtxn)?; for (word, _new_ids) in &postings_ids {
for result in iter { new_words.insert(word.clone());
let (word, ()) = result?;
new_words.insert(word);
} }
let new_words_fst = fst::Set::from_iter(new_words)?; let new_words_fst = fst::Set::from_iter(new_words.iter().map(SmallVec32::as_ref))?;
index.put_fst(wtxn, &new_words_fst)?; let indexed = Indexed { fst: new_words_fst, headers, postings_attrs, postings_ids, documents };
index.put_headers(wtxn, &headers)?; eprintln!("{:?}: Indexed created!", thread_index);
let before = Instant::now(); MtblKvStore::from_indexed(indexed).map(|x| vec![x])
compute_words_attributes_docids(wtxn, index)?; }
eprintln!("Computing the attributes documents ids took {:.02?}.", before.elapsed());
// 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" {
// Write the words fst
index.main.put::<_, Str, ByteSlice>(wtxn, "words-fst", val)?;
}
else if key == b"\0headers" {
// Write the headers
index.main.put::<_, Str, ByteSlice>(wtxn, "headers", val)?;
}
else if key.starts_with(&[1]) {
// Write the postings lists
index.word_positions.as_polymorph()
.put::<_, ByteSlice, ByteSlice>(wtxn, &key[1..], val)?;
}
else if key.starts_with(&[2]) {
// Write the prefix postings lists
index.prefix_word_positions.as_polymorph()
.put::<_, ByteSlice, ByteSlice>(wtxn, &key[1..], val)?;
}
else if key.starts_with(&[3]) {
// Write the postings lists
index.word_position_docids.as_polymorph()
.put::<_, ByteSlice, ByteSlice>(wtxn, &key[1..], val)?;
}
else if key.starts_with(&[4]) {
// Write the prefix postings lists
index.prefix_word_position_docids.as_polymorph()
.put::<_, ByteSlice, ByteSlice>(wtxn, &key[1..], val)?;
}
else if key.starts_with(&[5]) {
// Write the documents
index.documents.as_polymorph()
.put::<_, ByteSlice, ByteSlice>(wtxn, &key[1..], val)?;
}
Ok(()) Ok(())
} }
fn compute_words_attributes_docids(wtxn: &mut heed::RwTxn, index: &Index) -> anyhow::Result<()> { fn compute_words_attributes_docids(wtxn: &mut heed::RwTxn, index: &Index) -> anyhow::Result<()> {
let before = Instant::now();
eprintln!("Computing the attributes documents ids...");
let fst = match index.fst(&wtxn)? { let fst = match index.fst(&wtxn)? {
Some(fst) => fst.map_data(|s| s.to_vec())?, Some(fst) => fst.map_data(|s| s.to_vec())?,
None => return Ok(()), None => return Ok(()),
@ -209,7 +327,7 @@ fn compute_words_attributes_docids(wtxn: &mut heed::RwTxn, index: &Index) -> any
let key_pos = key_pos.try_into().map(u32::from_be_bytes)?; let key_pos = key_pos.try_into().map(u32::from_be_bytes)?;
// If the key corresponds to the word (minus the attribute) // If the key corresponds to the word (minus the attribute)
if key.len() == word.len() + 4 { if key.len() == word.len() + 4 {
let attribute = key_pos / 1000; let attribute = key_pos / MAX_POSITION as u32;
match word_attributes.entry(attribute) { match word_attributes.entry(attribute) {
Entry::Vacant(entry) => { entry.insert(docids); }, Entry::Vacant(entry) => { entry.insert(docids); },
Entry::Occupied(mut entry) => entry.get_mut().union_with(&docids), Entry::Occupied(mut entry) => entry.get_mut().union_with(&docids),
@ -226,249 +344,11 @@ fn compute_words_attributes_docids(wtxn: &mut heed::RwTxn, index: &Index) -> any
} }
} }
Ok(()) eprintln!("Computing the attributes documents ids took {:.02?}.", before.elapsed());
}
use std::collections::binary_heap::{BinaryHeap, PeekMut};
use std::cmp::{Ordering, Reverse};
// ------------ Value
struct Value<'t, KC, DC>
where
KC: heed::BytesDecode<'t>,
DC: heed::BytesDecode<'t>,
{
iter: heed::RoIter<'t, KC, DC>,
value: Option<heed::Result<(KC::DItem, DC::DItem)>>,
}
impl<'t, KC, DC> Value<'t, KC, DC>
where
KC: heed::BytesDecode<'t>,
DC: heed::BytesDecode<'t>,
{
fn new(mut iter: heed::RoIter<'t, KC, DC>) -> Option<Value<'t, KC, DC>> {
iter.next().map(|value| Value { iter, value: Some(value) })
}
fn peek_value(&mut self) -> Option<heed::Result<(KC::DItem, DC::DItem)>> {
std::mem::replace(&mut self.value, self.iter.next())
}
}
impl<'t, KC, DC> Ord for Value<'t, KC, DC>
where
KC: heed::BytesDecode<'t>,
DC: heed::BytesDecode<'t>,
KC::DItem: Ord,
{
fn cmp(&self, other: &Self) -> Ordering {
let a = self.value.as_ref().unwrap();
let b = other.value.as_ref().unwrap();
match (a, b) {
(Ok((a, _)), Ok((b, _))) => a.cmp(&b),
(Err(_), Err(_)) => Ordering::Equal,
(Err(_), _) => Ordering::Less,
(_, Err(_)) => Ordering::Greater,
}
}
}
impl<'t, KC, DC> Eq for Value<'t, KC, DC>
where
KC: heed::BytesDecode<'t>,
DC: heed::BytesDecode<'t>,
KC::DItem: Ord,
{ }
impl<'t, KC, DC> PartialEq for Value<'t, KC, DC>
where
KC: heed::BytesDecode<'t>,
DC: heed::BytesDecode<'t>,
KC::DItem: Ord,
{
fn eq(&self, other: &Self) -> bool {
self.cmp(other) == Ordering::Equal
}
}
impl<'t, KC, DC> PartialOrd for Value<'t, KC, DC>
where
KC: heed::BytesDecode<'t>,
DC: heed::BytesDecode<'t>,
KC::DItem: Ord,
{
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
// ------------
struct MergeIter<'t, KC, DC>
where
KC: heed::BytesDecode<'t>,
DC: heed::BytesDecode<'t>,
{
iters: BinaryHeap<Reverse<Value<'t, KC, DC>>>,
}
impl<'t, KC, DC> MergeIter<'t, KC, DC>
where
KC: heed::BytesDecode<'t>,
DC: heed::BytesDecode<'t>,
KC::DItem: Ord,
{
fn new(iters: Vec<heed::RoIter<'t, KC, DC>>) -> MergeIter<'t, KC, DC> {
let iters = iters.into_iter().filter_map(Value::new).map(Reverse).collect();
MergeIter { iters }
}
}
impl<'t, KC, DC> Iterator for MergeIter<'t, KC, DC>
where
KC: heed::BytesDecode<'t>,
DC: heed::BytesDecode<'t>,
KC::DItem: Ord,
{
type Item = heed::Result<(KC::DItem, DC::DItem)>;
fn next(&mut self) -> Option<Self::Item> {
let mut peek = self.iters.peek_mut()?;
let result = peek.0.peek_value().unwrap();
if peek.0.value.is_none() {
PeekMut::pop(peek);
}
Some(result)
}
}
fn merge_databases(
others: Vec<(TempDir, Env, Index)>,
wtxn: &mut heed::RwTxn,
index: &Index,
) -> anyhow::Result<()>
{
eprintln!("Merging the temporary databases...");
let rtxns: Result<Vec<_>, _> = others.iter().map(|(_, env, _)| env.read_txn()).collect();
let rtxns = rtxns?;
// merge the word positions
let sources: Result<Vec<_>, _> = others.iter().zip(&rtxns).map(|((.., i), t)| i.word_positions.iter(t)).collect();
let sources = sources?;
let mut dest = index.word_positions.iter_mut(wtxn)?;
let before = Instant::now();
for result in MergeIter::new(sources) {
let (k, v) = result?;
dest.append(&k, &v)?;
}
eprintln!("Merging the word_positions database took {:.02?}.", before.elapsed());
drop(dest);
// merge the word position documents ids
let sources: Result<Vec<_>, _> = others.iter().zip(&rtxns).map(|((.., i), t)| i.word_position_docids.iter(t)).collect();
let sources = sources?;
let mut dest = index.word_position_docids.iter_mut(wtxn)?;
let before = Instant::now();
for result in MergeIter::new(sources) {
let (k, v) = result?;
dest.append(&k, &v)?;
}
eprintln!("Merging the word_position_docids database took {:.02?}.", before.elapsed());
drop(dest);
// merge the word attribute documents ids
let sources: Result<Vec<_>, _> = others.iter().zip(&rtxns).map(|((.., i), t)| i.word_attribute_docids.iter(t)).collect();
let sources = sources?;
let mut dest = index.word_attribute_docids.iter_mut(wtxn)?;
let before = Instant::now();
let mut current = None as Option<(&[u8], RoaringBitmap)>;
for result in MergeIter::new(sources) {
let (k, v) = result?;
match current.as_mut() {
Some((ck, cv)) if ck == &k => cv.union_with(&v),
Some((ck, cv)) => {
dest.append(&ck, &cv)?;
current = Some((k, v));
},
None => current = Some((k, v)),
};
}
if let Some((ck, cv)) = current.take() {
dest.append(&ck, &cv)?;
}
eprintln!("Merging the word_attribute_docids database took {:.02?}.", before.elapsed());
drop(dest);
// merge the documents
let sources: Result<Vec<_>, _> = others.iter().zip(&rtxns).map(|((.., i), t)| {
i.documents.as_polymorph().iter::<_, ByteSlice, ByteSlice>(t)
}).collect();
let sources = sources?;
let mut dest = index.documents.as_polymorph().iter_mut::<_, ByteSlice, ByteSlice>(wtxn)?;
let before = Instant::now();
for result in MergeIter::new(sources) {
let (k, v) = result?;
dest.append(&k, &v)?;
}
eprintln!("Merging the documents database took {:.02?}.", before.elapsed());
drop(dest);
let mut fsts = Vec::new();
for ((_dir, _env, oindex), rtxn) in others.into_iter().zip(&rtxns) {
// merge and check the headers are equal
let headers = oindex.headers(&rtxn)?.context("A database is missing the headers")?;
match index.headers(wtxn)? {
Some(h) => ensure!(h == headers, "headers are not equal"),
None => index.put_headers(wtxn, &headers)?,
};
// retrieve the FSTs to merge them together in one run.
let fst = oindex.fst(&rtxn)?.context("A database is missing its FST")?;
let fst = fst.map_data(|s| s.to_vec())?;
fsts.push(fst);
}
let before = Instant::now();
// Merge all the FSTs to create a final one and write it in the final database.
if let Some(fst) = index.fst(wtxn)? {
let fst = fst.map_data(|s| s.to_vec())?;
fsts.push(fst);
}
let builder = OpBuilder::from_iter(&fsts);
let op = builder.r#union();
let mut builder = fst::set::SetBuilder::memory();
builder.extend_stream(op)?;
let fst = builder.into_set();
index.put_fst(wtxn, &fst)?;
eprintln!("Merging the FSTs took {:.02?}.", before.elapsed());
Ok(()) Ok(())
} }
fn open_env_index(path: impl AsRef<Path>) -> anyhow::Result<(Env, Index)> {
let env = EnvOpenOptions::new()
.map_size(100 * 1024 * 1024 * 1024) // 100 GB
.max_readers(10)
.max_dbs(10)
.open(path)?;
let index = Index::new(&env)?;
Ok((env, index))
}
fn main() -> anyhow::Result<()> { fn main() -> anyhow::Result<()> {
let opt = Opt::from_args(); let opt = Opt::from_args();
@ -477,32 +357,35 @@ fn main() -> anyhow::Result<()> {
} }
std::fs::create_dir_all(&opt.database)?; std::fs::create_dir_all(&opt.database)?;
let (env, index) = open_env_index(&opt.database)?; let env = EnvOpenOptions::new()
.map_size(100 * 1024 * 1024 * 1024) // 100 GB
.max_readers(10)
.max_dbs(10)
.open(opt.database)?;
let index = Index::new(&env)?;
// We duplicate the file # CPU times
let num_threads = rayon::current_num_threads(); let num_threads = rayon::current_num_threads();
let file = opt.csv_file.unwrap();
let csv_readers: Vec<_> = (0..num_threads).map(|_| csv::Reader::from_path(&file)).collect::<Result<_, _>>()?;
let result: anyhow::Result<_> = let stores: Vec<_> = csv_readers
(0..num_threads).into_par_iter().map(|i| { .into_iter()
let dir = tempfile::tempdir()?; .enumerate()
let (env, index) = open_env_index(&dir)?; .map(|(i, rdr)| index_csv(rdr, i, num_threads))
.collect::<Result<_, _>>()?;
let stores: Vec<_> = stores.into_iter().flatten().collect();
eprintln!("We are writing into LMDB...");
let mut wtxn = env.write_txn()?; let mut wtxn = env.write_txn()?;
let rdr = csv::Reader::from_path(&opt.csv_file)?;
index_csv(&mut wtxn, rdr, &index, opt.arc_cache_size, num_threads, i)?;
wtxn.commit()?; MtblKvStore::from_many(stores, |k, v| writer(&mut wtxn, &index, k, v))?;
compute_words_attributes_docids(&mut wtxn, &index)?;
Ok((dir, env, index))
})
.collect();
let mut wtxn = env.write_txn()?;
let parts = result?;
merge_databases(parts, &mut wtxn, &index)?;
let count = index.documents.len(&wtxn)?; let count = index.documents.len(&wtxn)?;
wtxn.commit()?; wtxn.commit()?;
eprintln!("Wrote {} documents into LMDB", count); eprintln!("Wrote {} documents into LMDB", count);
Ok(()) Ok(())

486
src/cache.rs
View File

@ -1,486 +0,0 @@
// MIT License
// Copyright (c) 2016 Jerome Froelich
use std::borrow::Borrow;
use std::fmt;
use std::hash::{Hash, Hasher};
use std::mem;
use std::ptr;
use std::usize;
use std::collections::HashMap;
use crate::FastMap8;
// Struct used to hold a reference to a key
#[doc(hidden)]
pub struct KeyRef<K> {
k: *const K,
}
impl<K: Hash> Hash for KeyRef<K> {
fn hash<H: Hasher>(&self, state: &mut H) {
unsafe { (*self.k).hash(state) }
}
}
impl<K: PartialEq> PartialEq for KeyRef<K> {
fn eq(&self, other: &KeyRef<K>) -> bool {
unsafe { (*self.k).eq(&*other.k) }
}
}
impl<K: Eq> Eq for KeyRef<K> {}
impl<K> Borrow<K> for KeyRef<K> {
fn borrow(&self) -> &K {
unsafe { &*self.k }
}
}
// Struct used to hold a key value pair. Also contains references to previous and next entries
// so we can maintain the entries in a linked list ordered by their use.
struct LruEntry<K, V> {
key: mem::MaybeUninit<K>,
val: mem::MaybeUninit<V>,
prev: *mut LruEntry<K, V>,
next: *mut LruEntry<K, V>,
}
impl<K, V> LruEntry<K, V> {
fn new(key: K, val: V) -> Self {
LruEntry {
key: mem::MaybeUninit::new(key),
val: mem::MaybeUninit::new(val),
prev: ptr::null_mut(),
next: ptr::null_mut(),
}
}
fn new_sigil() -> Self {
LruEntry {
key: mem::MaybeUninit::uninit(),
val: mem::MaybeUninit::uninit(),
prev: ptr::null_mut(),
next: ptr::null_mut(),
}
}
}
/// An LRU Cache.
pub struct LruCache<K, V> {
map: FastMap8<KeyRef<K>, Box<LruEntry<K, V>>>,
cap: usize,
// head and tail are sigil nodes to faciliate inserting entries
head: *mut LruEntry<K, V>,
tail: *mut LruEntry<K, V>,
}
impl<K: Hash + Eq, V> LruCache<K, V> {
/// Creates a new LRU Cache that holds at most `cap` items.
pub fn new(cap: usize) -> LruCache<K, V> {
let mut map = FastMap8::default();
map.reserve(cap);
LruCache::construct(cap, map)
}
/// Creates a new LRU Cache that never automatically evicts items.
pub fn unbounded() -> LruCache<K, V> {
LruCache::construct(usize::MAX, HashMap::default())
}
}
impl<K: Hash + Eq, V> LruCache<K, V> {
/// Creates a new LRU Cache with the given capacity.
fn construct(cap: usize, map: FastMap8<KeyRef<K>, Box<LruEntry<K, V>>>) -> LruCache<K, V> {
// NB: The compiler warns that cache does not need to be marked as mutable if we
// declare it as such since we only mutate it inside the unsafe block.
let cache = LruCache {
map,
cap,
head: Box::into_raw(Box::new(LruEntry::new_sigil())),
tail: Box::into_raw(Box::new(LruEntry::new_sigil())),
};
unsafe {
(*cache.head).next = cache.tail;
(*cache.tail).prev = cache.head;
}
cache
}
/// Puts a key-value pair into cache. If the capacity is reached the evicted entry is returned.
pub fn insert(&mut self, k: K, mut v: V) -> Option<(K, V)> {
let node_ptr = self.map.get_mut(&KeyRef { k: &k }).map(|node| {
let node_ptr: *mut LruEntry<K, V> = &mut **node;
node_ptr
});
match node_ptr {
Some(node_ptr) => {
// if the key is already in the cache just update its value and move it to the
// front of the list
unsafe { mem::swap(&mut v, &mut (*(*node_ptr).val.as_mut_ptr()) as &mut V) }
self.detach(node_ptr);
self.attach(node_ptr);
None
}
None => {
let (mut node, old_entry) = if self.len() == self.cap() {
// if the cache is full, remove the last entry so we can use it for the new key
let old_key = KeyRef {
k: unsafe { &(*(*(*self.tail).prev).key.as_ptr()) },
};
let mut old_node = self.map.remove(&old_key).unwrap();
// extract the node's current key and val so we can overwrite them
let old_entry = unsafe { (old_node.key.assume_init(), old_node.val.assume_init()) };
old_node.key = mem::MaybeUninit::new(k);
old_node.val = mem::MaybeUninit::new(v);
let node_ptr: *mut LruEntry<K, V> = &mut *old_node;
self.detach(node_ptr);
(old_node, Some(old_entry))
} else {
// if the cache is not full allocate a new LruEntry
(Box::new(LruEntry::new(k, v)), None)
};
let node_ptr: *mut LruEntry<K, V> = &mut *node;
self.attach(node_ptr);
let keyref = unsafe { (*node_ptr).key.as_ptr() };
self.map.insert(KeyRef { k: keyref }, node);
old_entry
}
}
}
/// Returns a mutable reference to the value of the key in the cache or `None` if it
/// is not present in the cache. Moves the key to the head of the LRU list if it exists.
pub fn get_mut<'a, Q>(&'a mut self, k: &Q) -> Option<&'a mut V>
where
KeyRef<K>: Borrow<Q>,
Q: Hash + Eq + ?Sized,
{
if let Some(node) = self.map.get_mut(k) {
let node_ptr: *mut LruEntry<K, V> = &mut **node;
self.detach(node_ptr);
self.attach(node_ptr);
Some(unsafe { &mut (*(*node_ptr).val.as_mut_ptr()) as &mut V })
} else {
None
}
}
/// Returns a bool indicating whether the given key is in the cache. Does not update the
/// LRU list.
pub fn contains_key<Q>(&self, k: &Q) -> bool
where
KeyRef<K>: Borrow<Q>,
Q: Hash + Eq + ?Sized,
{
self.map.contains_key(k)
}
/// Removes and returns the value corresponding to the key from the cache or
/// `None` if it does not exist.
pub fn remove<Q>(&mut self, k: &Q) -> Option<V>
where
KeyRef<K>: Borrow<Q>,
Q: Hash + Eq + ?Sized,
{
match self.map.remove(&k) {
None => None,
Some(mut old_node) => {
let node_ptr: *mut LruEntry<K, V> = &mut *old_node;
self.detach(node_ptr);
unsafe { Some(old_node.val.assume_init()) }
}
}
}
/// Removes and returns the key and value corresponding to the least recently
/// used item or `None` if the cache is empty.
pub fn remove_lru(&mut self) -> Option<(K, V)> {
let node = self.remove_last()?;
// N.B.: Can't destructure directly because of https://github.com/rust-lang/rust/issues/28536
let node = *node;
let LruEntry { key, val, .. } = node;
unsafe { Some((key.assume_init(), val.assume_init())) }
}
/// Returns the number of key-value pairs that are currently in the the cache.
pub fn len(&self) -> usize {
self.map.len()
}
/// Returns a bool indicating whether the cache is empty or not.
pub fn is_empty(&self) -> bool {
self.map.len() == 0
}
/// Returns the maximum number of key-value pairs the cache can hold.
pub fn cap(&self) -> usize {
self.cap
}
/// Resizes the cache. If the new capacity is smaller than the size of the current
/// cache any entries past the new capacity are discarded.
pub fn resize(&mut self, cap: usize) {
// return early if capacity doesn't change
if cap == self.cap {
return;
}
while self.map.len() > cap {
self.remove_last();
}
self.map.shrink_to_fit();
self.cap = cap;
}
/// Clears the contents of the cache.
pub fn clear(&mut self) {
loop {
match self.remove_last() {
Some(_) => (),
None => break,
}
}
}
fn remove_last(&mut self) -> Option<Box<LruEntry<K, V>>> {
let prev;
unsafe { prev = (*self.tail).prev }
if prev != self.head {
let old_key = KeyRef {
k: unsafe { &(*(*(*self.tail).prev).key.as_ptr()) },
};
let mut old_node = self.map.remove(&old_key).unwrap();
let node_ptr: *mut LruEntry<K, V> = &mut *old_node;
self.detach(node_ptr);
Some(old_node)
} else {
None
}
}
fn detach(&mut self, node: *mut LruEntry<K, V>) {
unsafe {
(*(*node).prev).next = (*node).next;
(*(*node).next).prev = (*node).prev;
}
}
fn attach(&mut self, node: *mut LruEntry<K, V>) {
unsafe {
(*node).next = (*self.head).next;
(*node).prev = self.head;
(*self.head).next = node;
(*(*node).next).prev = node;
}
}
}
impl<K, V> Drop for LruCache<K, V> {
fn drop(&mut self) {
self.map.values_mut().for_each(|e| unsafe {
ptr::drop_in_place(e.key.as_mut_ptr());
ptr::drop_in_place(e.val.as_mut_ptr());
});
// We rebox the head/tail, and because these are maybe-uninit
// they do not have the absent k/v dropped.
unsafe {
let _head = *Box::from_raw(self.head);
let _tail = *Box::from_raw(self.tail);
}
}
}
impl<K, V> IntoIterator for LruCache<K, V> {
type Item = (K, V);
type IntoIter = IntoIter<K, V>;
fn into_iter(mut self) -> IntoIter<K, V> {
let map = mem::replace(&mut self.map, FastMap8::default());
IntoIter { iter: map.into_iter() }
}
}
// The compiler does not automatically derive Send and Sync for LruCache because it contains
// raw pointers. The raw pointers are safely encapsulated by LruCache though so we can
// implement Send and Sync for it below.
unsafe impl<K: Send, V: Send> Send for LruCache<K, V> {}
unsafe impl<K: Sync, V: Sync> Sync for LruCache<K, V> {}
impl<K: Hash + Eq, V> fmt::Debug for LruCache<K, V> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("LruCache")
.field("len", &self.len())
.field("cap", &self.cap())
.finish()
}
}
/// An iterator over the entries of a `LruCache`.
pub struct IntoIter<K, V> {
iter: std::collections::hash_map::IntoIter<KeyRef<K>, Box<LruEntry<K, V>>>,
}
impl<K, V> Iterator for IntoIter<K, V> {
type Item = (K, V);
fn next(&mut self) -> Option<(K, V)> {
match self.iter.next() {
Some((_, node)) => {
let LruEntry { key, val, .. } = *node;
unsafe { Some((key.assume_init(), val.assume_init())) }
},
None => None,
}
}
}
pub struct ArcCache<K, V>
where
K: Eq + Hash,
{
recent_set: LruCache<K, V>,
recent_evicted: LruCache<K, ()>,
frequent_set: LruCache<K, V>,
frequent_evicted: LruCache<K, ()>,
capacity: usize,
p: usize,
}
impl<K, V> ArcCache<K, V>
where
K: Eq + Hash + Clone,
{
pub fn new(capacity: usize) -> ArcCache<K, V> {
assert_ne!(capacity, 0, "cache length cannot be zero");
ArcCache {
recent_set: LruCache::new(capacity),
recent_evicted: LruCache::new(capacity),
frequent_set: LruCache::new(capacity),
frequent_evicted: LruCache::new(capacity),
capacity: capacity,
p: 0,
}
}
pub fn insert<F>(&mut self, key: K, value: V, mut merge: F) -> Vec<(K, V)>
where F: FnMut(V, V) -> V
{
let mut evicted = Vec::new();
if self.frequent_set.contains_key(&key) {
evicted.extend(self.frequent_set.insert(key, value));
return evicted;
}
if let Some(prev_value) = self.recent_set.remove(&key) {
let value = (merge)(prev_value, value);
evicted.extend(self.frequent_set.insert(key, value));
return evicted;
}
if self.frequent_evicted.contains_key(&key) {
let recent_evicted_len = self.recent_evicted.len();
let frequent_evicted_len = self.frequent_evicted.len();
let delta = if recent_evicted_len > frequent_evicted_len {
recent_evicted_len / frequent_evicted_len
} else {
1
};
if delta < self.p {
self.p -= delta;
} else {
self.p = 0
}
if self.recent_set.len() + self.frequent_set.len() >= self.capacity {
evicted.extend(self.replace(true));
}
self.frequent_evicted.remove(&key);
evicted.extend(self.frequent_set.insert(key, value));
return evicted;
}
if self.recent_evicted.contains_key(&key) {
let recent_evicted_len = self.recent_evicted.len();
let frequent_evicted_len = self.frequent_evicted.len();
let delta = if frequent_evicted_len > recent_evicted_len {
frequent_evicted_len / recent_evicted_len
} else {
1
};
if delta <= self.capacity - self.p {
self.p += delta;
} else {
self.p = self.capacity;
}
if self.recent_set.len() + self.frequent_set.len() >= self.capacity {
evicted.extend(self.replace(false));
}
self.recent_evicted.remove(&key);
evicted.extend(self.frequent_set.insert(key, value));
return evicted;
}
let mut evicted = Vec::with_capacity(2);
if self.recent_set.len() + self.frequent_set.len() >= self.capacity {
evicted.extend(self.replace(false));
}
if self.recent_evicted.len() > self.capacity - self.p {
self.recent_evicted.remove_lru();
}
if self.frequent_evicted.len() > self.p {
self.frequent_evicted.remove_lru();
}
evicted.extend(self.recent_set.insert(key, value));
evicted
}
pub fn get_mut(&mut self, key: &K) -> (Option<&mut V>, Option<(K, V)>)
where
K: Clone + Hash + Eq,
{
let evicted = match self.recent_set.remove(key) {
Some(value) => self.frequent_set.insert(key.clone(), value),
None => None,
};
(self.frequent_set.get_mut(key), evicted)
}
fn replace(&mut self, frequent_evicted_contains_key: bool) -> Option<(K, V)> {
let recent_set_len = self.recent_set.len();
if recent_set_len > 0
&& (recent_set_len > self.p
|| (recent_set_len == self.p && frequent_evicted_contains_key))
{
if let Some((old_key, old_val)) = self.recent_set.remove_lru() {
self.recent_evicted.insert(old_key.clone(), ());
return Some((old_key, old_val));
}
} else {
if let Some((old_key, old_val)) = self.frequent_set.remove_lru() {
self.frequent_evicted.insert(old_key.clone(), ());
return Some((old_key, old_val));
}
}
None
}
}
impl<K: Eq + Hash, V> IntoIterator for ArcCache<K, V>{
type Item = (K, V);
type IntoIter = std::iter::Chain<IntoIter<K, V>, IntoIter<K, V>>;
fn into_iter(self) -> Self::IntoIter {
self.recent_set.into_iter().chain(self.frequent_set)
}
}

1
src/lib.rs
View File

@ -2,7 +2,6 @@ mod best_proximity;
mod heed_codec; mod heed_codec;
mod iter_shortest_paths; mod iter_shortest_paths;
mod query_tokens; mod query_tokens;
pub mod cache;
use std::borrow::Cow; use std::borrow::Cow;
use std::collections::HashMap; use std::collections::HashMap;