530 lines
19 KiB
Rust
530 lines
19 KiB
Rust
use {
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crate::{
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bucket_item::BucketItem,
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bucket_map::BucketMapError,
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bucket_stats::BucketMapStats,
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bucket_storage::{BucketStorage, Uid, DEFAULT_CAPACITY_POW2},
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index_entry::IndexEntry,
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MaxSearch, RefCount,
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},
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rand::{thread_rng, Rng},
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solana_measure::measure::Measure,
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solana_sdk::pubkey::Pubkey,
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std::{
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collections::hash_map::DefaultHasher,
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hash::{Hash, Hasher},
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marker::PhantomData,
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ops::RangeBounds,
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path::PathBuf,
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sync::{
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atomic::{AtomicU64, AtomicUsize, Ordering},
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Arc, Mutex,
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},
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},
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};
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#[derive(Default)]
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pub struct ReallocatedItems {
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// Some if the index was reallocated
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// u64 is random associated with the new index
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pub index: Option<(u64, BucketStorage)>,
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// Some for a data bucket reallocation
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// u64 is data bucket index
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pub data: Option<(u64, BucketStorage)>,
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}
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#[derive(Default)]
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pub struct Reallocated {
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/// > 0 if reallocations are encoded
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pub active_reallocations: AtomicUsize,
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/// actual reallocated bucket
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/// mutex because bucket grow code runs with a read lock
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pub items: Mutex<ReallocatedItems>,
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}
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impl Reallocated {
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/// specify that a reallocation has occurred
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pub fn add_reallocation(&self) {
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assert_eq!(
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0,
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self.active_reallocations.fetch_add(1, Ordering::Relaxed),
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"Only 1 reallocation can occur at a time"
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);
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}
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/// Return true IFF a reallocation has occurred.
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/// Calling this takes conceptual ownership of the reallocation encoded in the struct.
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pub fn get_reallocated(&self) -> bool {
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self.active_reallocations
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.compare_exchange(1, 0, Ordering::Acquire, Ordering::Relaxed)
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.is_ok()
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}
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}
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// >= 2 instances of BucketStorage per 'bucket' in the bucket map. 1 for index, >= 1 for data
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pub struct Bucket<T> {
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drives: Arc<Vec<PathBuf>>,
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//index
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pub index: BucketStorage,
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//random offset for the index
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random: u64,
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//storage buckets to store SlotSlice up to a power of 2 in len
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pub data: Vec<BucketStorage>,
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_phantom: PhantomData<T>,
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stats: Arc<BucketMapStats>,
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pub reallocated: Reallocated,
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}
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impl<T: Clone + Copy> Bucket<T> {
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pub fn new(
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drives: Arc<Vec<PathBuf>>,
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max_search: MaxSearch,
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stats: Arc<BucketMapStats>,
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count: Arc<AtomicU64>,
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) -> Self {
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let index = BucketStorage::new(
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Arc::clone(&drives),
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1,
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std::mem::size_of::<IndexEntry>() as u64,
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max_search,
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Arc::clone(&stats.index),
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count,
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);
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Self {
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random: thread_rng().gen(),
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drives,
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index,
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data: vec![],
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_phantom: PhantomData::default(),
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stats,
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reallocated: Reallocated::default(),
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}
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}
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pub fn keys(&self) -> Vec<Pubkey> {
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let mut rv = vec![];
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for i in 0..self.index.capacity() {
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if self.index.is_free(i) {
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continue;
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}
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let ix: &IndexEntry = self.index.get(i);
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rv.push(ix.key);
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}
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rv
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}
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pub fn items_in_range<R>(&self, range: &Option<&R>) -> Vec<BucketItem<T>>
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where
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R: RangeBounds<Pubkey>,
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{
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let mut result = Vec::with_capacity(self.index.count.load(Ordering::Relaxed) as usize);
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for i in 0..self.index.capacity() {
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let ii = i % self.index.capacity();
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if self.index.is_free(ii) {
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continue;
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}
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let ix: &IndexEntry = self.index.get(ii);
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let key = ix.key;
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if range.map(|r| r.contains(&key)).unwrap_or(true) {
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let val = ix.read_value(self);
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result.push(BucketItem {
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pubkey: key,
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ref_count: ix.ref_count(),
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slot_list: val.map(|(v, _ref_count)| v.to_vec()).unwrap_or_default(),
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});
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}
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}
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result
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}
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pub fn find_entry(&self, key: &Pubkey) -> Option<(&IndexEntry, u64)> {
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Self::bucket_find_entry(&self.index, key, self.random)
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}
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fn find_entry_mut<'a>(
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&'a self,
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key: &Pubkey,
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) -> Result<(bool, &'a mut IndexEntry, u64), BucketMapError> {
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let ix = Self::bucket_index_ix(&self.index, key, self.random);
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let mut first_free = None;
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let mut m = Measure::start("bucket_find_entry_mut");
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for i in ix..ix + self.index.max_search() {
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let ii = i % self.index.capacity();
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if self.index.is_free(ii) {
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if first_free.is_none() {
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first_free = Some(ii);
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}
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continue;
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}
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let elem: &mut IndexEntry = self.index.get_mut(ii);
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if elem.key == *key {
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m.stop();
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self.stats
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.index
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.find_entry_mut_us
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.fetch_add(m.as_us(), Ordering::Relaxed);
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return Ok((true, elem, ii));
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}
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}
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m.stop();
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self.stats
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.index
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.find_entry_mut_us
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.fetch_add(m.as_us(), Ordering::Relaxed);
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match first_free {
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Some(ii) => {
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let elem: &mut IndexEntry = self.index.get_mut(ii);
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Ok((false, elem, ii))
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}
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None => Err(self.index_no_space()),
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}
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}
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fn bucket_find_entry<'a>(
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index: &'a BucketStorage,
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key: &Pubkey,
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random: u64,
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) -> Option<(&'a IndexEntry, u64)> {
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let ix = Self::bucket_index_ix(index, key, random);
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for i in ix..ix + index.max_search() {
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let ii = i % index.capacity();
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if index.is_free(ii) {
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continue;
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}
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let elem: &IndexEntry = index.get(ii);
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if elem.key == *key {
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return Some((elem, ii));
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}
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}
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None
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}
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fn bucket_create_key(
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index: &mut BucketStorage,
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key: &Pubkey,
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elem_uid: Uid,
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random: u64,
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is_resizing: bool,
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) -> Result<u64, BucketMapError> {
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let mut m = Measure::start("bucket_create_key");
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let ix = Self::bucket_index_ix(index, key, random);
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for i in ix..ix + index.max_search() {
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let ii = i % index.capacity();
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if !index.is_free(ii) {
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continue;
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}
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index.allocate(ii, elem_uid, is_resizing).unwrap();
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let elem: &mut IndexEntry = index.get_mut(ii);
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// These fields will be overwritten after allocation by callers.
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// Since this part of the mmapped file could have previously been used by someone else, there can be garbage here.
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elem.init(key);
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//debug!( "INDEX ALLOC {:?} {} {} {}", key, ii, index.capacity, elem_uid );
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m.stop();
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index
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.stats
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.find_entry_mut_us
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.fetch_add(m.as_us(), Ordering::Relaxed);
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return Ok(ii);
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}
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m.stop();
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index
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.stats
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.find_entry_mut_us
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.fetch_add(m.as_us(), Ordering::Relaxed);
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Err(BucketMapError::IndexNoSpace(index.capacity_pow2))
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}
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pub fn addref(&mut self, key: &Pubkey) -> Option<RefCount> {
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if let Ok((found, elem, _)) = self.find_entry_mut(key) {
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if found {
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elem.ref_count += 1;
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return Some(elem.ref_count);
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}
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}
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None
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}
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pub fn unref(&mut self, key: &Pubkey) -> Option<RefCount> {
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if let Ok((found, elem, _)) = self.find_entry_mut(key) {
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if found {
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elem.ref_count -= 1;
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return Some(elem.ref_count);
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}
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}
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None
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}
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pub fn read_value(&self, key: &Pubkey) -> Option<(&[T], RefCount)> {
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//debug!("READ_VALUE: {:?}", key);
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let (elem, _) = self.find_entry(key)?;
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elem.read_value(self)
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}
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fn index_no_space(&self) -> BucketMapError {
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BucketMapError::IndexNoSpace(self.index.capacity_pow2)
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}
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pub fn try_write(
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&mut self,
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key: &Pubkey,
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data: &[T],
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ref_count: RefCount,
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) -> Result<(), BucketMapError> {
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let best_fit_bucket = IndexEntry::data_bucket_from_num_slots(data.len() as u64);
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if self.data.get(best_fit_bucket as usize).is_none() {
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// fail early if the data bucket we need doesn't exist - we don't want the index entry partially allocated
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return Err(BucketMapError::DataNoSpace((best_fit_bucket, 0)));
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}
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let (found, elem, elem_ix) = self.find_entry_mut(key)?;
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if !found {
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let is_resizing = false;
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let elem_uid = IndexEntry::key_uid(key);
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self.index.allocate(elem_ix, elem_uid, is_resizing).unwrap();
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// These fields will be overwritten after allocation by callers.
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// Since this part of the mmapped file could have previously been used by someone else, there can be garbage here.
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elem.init(key);
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}
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elem.ref_count = ref_count;
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let elem_uid = self.index.uid_unchecked(elem_ix);
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let bucket_ix = elem.data_bucket_ix();
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let current_bucket = &self.data[bucket_ix as usize];
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let num_slots = data.len() as u64;
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if best_fit_bucket == bucket_ix && elem.num_slots > 0 {
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// in place update
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let elem_loc = elem.data_loc(current_bucket);
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let slice: &mut [T] = current_bucket.get_mut_cell_slice(elem_loc, data.len() as u64);
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assert_eq!(current_bucket.uid(elem_loc), Some(elem_uid));
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elem.num_slots = num_slots;
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slice.copy_from_slice(data);
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Ok(())
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} else {
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// need to move the allocation to a best fit spot
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let best_bucket = &self.data[best_fit_bucket as usize];
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let cap_power = best_bucket.capacity_pow2;
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let cap = best_bucket.capacity();
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let pos = thread_rng().gen_range(0, cap);
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for i in pos..pos + self.index.max_search() {
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let ix = i % cap;
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if best_bucket.is_free(ix) {
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let elem_loc = elem.data_loc(current_bucket);
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let old_slots = elem.num_slots;
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elem.set_storage_offset(ix);
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elem.set_storage_capacity_when_created_pow2(best_bucket.capacity_pow2);
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elem.num_slots = num_slots;
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if old_slots > 0 {
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let current_bucket = &mut self.data[bucket_ix as usize];
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current_bucket.free(elem_loc, elem_uid);
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}
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//debug!( "DATA ALLOC {:?} {} {} {}", key, elem.data_location, best_bucket.capacity, elem_uid );
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if num_slots > 0 {
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let best_bucket = &mut self.data[best_fit_bucket as usize];
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best_bucket.allocate(ix, elem_uid, false).unwrap();
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let slice = best_bucket.get_mut_cell_slice(ix, num_slots);
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slice.copy_from_slice(data);
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}
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return Ok(());
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}
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}
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Err(BucketMapError::DataNoSpace((best_fit_bucket, cap_power)))
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}
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}
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pub fn delete_key(&mut self, key: &Pubkey) {
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if let Some((elem, elem_ix)) = self.find_entry(key) {
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let elem_uid = self.index.uid_unchecked(elem_ix);
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if elem.num_slots > 0 {
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let ix = elem.data_bucket_ix() as usize;
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let data_bucket = &self.data[ix];
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let loc = elem.data_loc(data_bucket);
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let data_bucket = &mut self.data[ix];
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//debug!( "DATA FREE {:?} {} {} {}", key, elem.data_location, data_bucket.capacity, elem_uid );
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data_bucket.free(loc, elem_uid);
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}
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//debug!("INDEX FREE {:?} {}", key, elem_uid);
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self.index.free(elem_ix, elem_uid);
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}
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}
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pub fn grow_index(&self, current_capacity_pow2: u8) {
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if self.index.capacity_pow2 == current_capacity_pow2 {
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let mut m = Measure::start("grow_index");
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//debug!("GROW_INDEX: {}", current_capacity_pow2);
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let increment = 1;
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for i in increment.. {
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//increasing the capacity by ^4 reduces the
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//likelyhood of a re-index collision of 2^(max_search)^2
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//1 in 2^32
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let mut index = BucketStorage::new_with_capacity(
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Arc::clone(&self.drives),
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1,
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std::mem::size_of::<IndexEntry>() as u64,
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// *2 causes rapid growth of index buckets
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self.index.capacity_pow2 + i, // * 2,
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self.index.max_search,
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Arc::clone(&self.stats.index),
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Arc::clone(&self.index.count),
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);
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let random = thread_rng().gen();
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let mut valid = true;
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for ix in 0..self.index.capacity() {
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let uid = self.index.uid(ix);
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if let Some(uid) = uid {
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let elem: &IndexEntry = self.index.get(ix);
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let new_ix =
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Self::bucket_create_key(&mut index, &elem.key, uid, random, true);
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if new_ix.is_err() {
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valid = false;
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break;
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}
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let new_ix = new_ix.unwrap();
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let new_elem: &mut IndexEntry = index.get_mut(new_ix);
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*new_elem = *elem;
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/*
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let dbg_elem: IndexEntry = *new_elem;
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assert_eq!(
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Self::bucket_find_entry(&index, &elem.key, random).unwrap(),
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(&dbg_elem, new_ix)
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);
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*/
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}
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}
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if valid {
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let sz = index.capacity();
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{
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let mut max = self.stats.index.max_size.lock().unwrap();
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*max = std::cmp::max(*max, sz);
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}
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let mut items = self.reallocated.items.lock().unwrap();
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items.index = Some((random, index));
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self.reallocated.add_reallocation();
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break;
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}
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}
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m.stop();
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self.stats.index.resizes.fetch_add(1, Ordering::Relaxed);
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self.stats
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.index
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.resize_us
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.fetch_add(m.as_us(), Ordering::Relaxed);
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}
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}
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pub fn apply_grow_index(&mut self, random: u64, index: BucketStorage) {
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self.random = random;
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self.index = index;
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}
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fn elem_size() -> u64 {
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std::mem::size_of::<T>() as u64
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}
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pub fn apply_grow_data(&mut self, ix: usize, bucket: BucketStorage) {
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if self.data.get(ix).is_none() {
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for i in self.data.len()..ix {
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// insert empty data buckets
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self.data.push(BucketStorage::new(
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Arc::clone(&self.drives),
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1 << i,
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Self::elem_size(),
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self.index.max_search,
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Arc::clone(&self.stats.data),
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Arc::default(),
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))
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}
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self.data.push(bucket);
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} else {
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self.data[ix] = bucket;
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}
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}
|
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|
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/// grow a data bucket
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/// The application of the new bucket is deferred until the next write lock.
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pub fn grow_data(&self, data_index: u64, current_capacity_pow2: u8) {
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let new_bucket = BucketStorage::new_resized(
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&self.drives,
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self.index.max_search,
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self.data.get(data_index as usize),
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std::cmp::max(current_capacity_pow2 + 1, DEFAULT_CAPACITY_POW2),
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1 << data_index,
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Self::elem_size(),
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&self.stats.data,
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);
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self.reallocated.add_reallocation();
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let mut items = self.reallocated.items.lock().unwrap();
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items.data = Some((data_index, new_bucket));
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}
|
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fn bucket_index_ix(index: &BucketStorage, key: &Pubkey, random: u64) -> u64 {
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let uid = IndexEntry::key_uid(key);
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let mut s = DefaultHasher::new();
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uid.hash(&mut s);
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//the locally generated random will make it hard for an attacker
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//to deterministically cause all the pubkeys to land in the same
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//location in any bucket on all validators
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random.hash(&mut s);
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let ix = s.finish();
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ix % index.capacity()
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//debug!( "INDEX_IX: {:?} uid:{} loc: {} cap:{}", key, uid, location, index.capacity() );
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}
|
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|
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/// grow the appropriate piece. Note this takes an immutable ref.
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/// The actual grow is set into self.reallocated and applied later on a write lock
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pub fn grow(&self, err: BucketMapError) {
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match err {
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BucketMapError::DataNoSpace((data_index, current_capacity_pow2)) => {
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//debug!("GROWING SPACE {:?}", (data_index, current_capacity_pow2));
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self.grow_data(data_index, current_capacity_pow2);
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}
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BucketMapError::IndexNoSpace(current_capacity_pow2) => {
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//debug!("GROWING INDEX {}", sz);
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self.grow_index(current_capacity_pow2);
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}
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}
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}
|
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|
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/// if a bucket was resized previously with a read lock, then apply that resize now
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pub fn handle_delayed_grows(&mut self) {
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if self.reallocated.get_reallocated() {
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// swap out the bucket that was resized previously with a read lock
|
|
let mut items = std::mem::take(&mut *self.reallocated.items.lock().unwrap());
|
|
|
|
if let Some((random, bucket)) = items.index.take() {
|
|
self.apply_grow_index(random, bucket);
|
|
} else {
|
|
// data bucket
|
|
let (i, new_bucket) = items.data.take().unwrap();
|
|
self.apply_grow_data(i as usize, new_bucket);
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn insert(&mut self, key: &Pubkey, value: (&[T], RefCount)) {
|
|
let (new, refct) = value;
|
|
loop {
|
|
let rv = self.try_write(key, new, refct);
|
|
match rv {
|
|
Ok(_) => return,
|
|
Err(err) => {
|
|
self.grow(err);
|
|
self.handle_delayed_grows();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn update<F>(&mut self, key: &Pubkey, mut updatefn: F)
|
|
where
|
|
F: FnMut(Option<(&[T], RefCount)>) -> Option<(Vec<T>, RefCount)>,
|
|
{
|
|
let current = self.read_value(key);
|
|
let new = updatefn(current);
|
|
if new.is_none() {
|
|
self.delete_key(key);
|
|
return;
|
|
}
|
|
let (new, refct) = new.unwrap();
|
|
self.insert(key, (&new, refct));
|
|
}
|
|
}
|