File size: 6,074 Bytes
1e92f2d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 | use std::{
cmp::max,
path::PathBuf,
sync::Arc,
thread::{JoinHandle, available_parallelism, spawn},
};
use anyhow::Result;
use parking_lot::Mutex;
use turbo_persistence::{
ArcSlice, CompactConfig, KeyBase, StoreKey, TurboPersistence, ValueBuffer,
};
use crate::database::{
key_value_database::{KeySpace, KeyValueDatabase},
write_batch::{BaseWriteBatch, ConcurrentWriteBatch, WriteBatch, WriteBuffer},
};
const MB: u64 = 1024 * 1024;
const COMPACT_CONFIG: CompactConfig = CompactConfig {
min_merge_count: 3,
optimal_merge_count: 8,
max_merge_count: 64,
max_merge_bytes: 512 * MB,
min_merge_duplication_bytes: MB,
optimal_merge_duplication_bytes: 100 * MB,
max_merge_segment_count: 16,
};
pub struct TurboKeyValueDatabase {
db: Arc<TurboPersistence>,
compact_join_handle: Mutex<Option<JoinHandle<Result<()>>>>,
}
impl TurboKeyValueDatabase {
pub fn new(versioned_path: PathBuf) -> Result<Self> {
let db = Arc::new(TurboPersistence::open(versioned_path)?);
let mut this = Self {
db: db.clone(),
compact_join_handle: Mutex::new(None),
};
// start compaction in background if the database is not empty
if !db.is_empty() {
let handle = spawn(move || {
db.compact(&CompactConfig {
max_merge_segment_count: available_parallelism()
.map_or(4, |c| max(4, c.get() / 4)),
..COMPACT_CONFIG
})
});
this.compact_join_handle.get_mut().replace(handle);
}
Ok(this)
}
}
impl KeyValueDatabase for TurboKeyValueDatabase {
type ReadTransaction<'l>
= ()
where
Self: 'l;
fn is_empty(&self) -> bool {
self.db.is_empty()
}
fn begin_read_transaction(&self) -> Result<Self::ReadTransaction<'_>> {
Ok(())
}
type ValueBuffer<'l>
= ArcSlice<u8>
where
Self: 'l;
fn get<'l, 'db: 'l>(
&'l self,
_transaction: &'l Self::ReadTransaction<'db>,
key_space: KeySpace,
key: &[u8],
) -> Result<Option<Self::ValueBuffer<'l>>> {
self.db.get(key_space as usize, &key)
}
type ConcurrentWriteBatch<'l>
= TurboWriteBatch<'l>
where
Self: 'l;
fn write_batch(
&self,
) -> Result<WriteBatch<'_, Self::SerialWriteBatch<'_>, Self::ConcurrentWriteBatch<'_>>> {
// Wait for the compaction to finish
if let Some(join_handle) = self.compact_join_handle.lock().take() {
join_handle.join().unwrap()?;
}
// Start a new write batch
Ok(WriteBatch::concurrent(TurboWriteBatch {
batch: self.db.write_batch()?,
db: &self.db,
compact_join_handle: &self.compact_join_handle,
initial_write: self.db.is_empty(),
}))
}
fn prevent_writes(&self) {}
fn shutdown(&self) -> Result<()> {
// Wait for the compaction to finish
if let Some(join_handle) = self.compact_join_handle.lock().take() {
join_handle.join().unwrap()?;
}
// Shutdown the database
self.db.shutdown()
}
}
pub struct TurboWriteBatch<'a> {
batch: turbo_persistence::WriteBatch<WriteBuffer<'static>, 5>,
db: &'a Arc<TurboPersistence>,
compact_join_handle: &'a Mutex<Option<JoinHandle<Result<()>>>>,
initial_write: bool,
}
impl<'a> BaseWriteBatch<'a> for TurboWriteBatch<'a> {
type ValueBuffer<'l>
= ArcSlice<u8>
where
Self: 'l,
'a: 'l;
fn get<'l>(&'l self, key_space: KeySpace, key: &[u8]) -> Result<Option<Self::ValueBuffer<'l>>>
where
'a: 'l,
{
self.db.get(key_space as usize, &key)
}
fn commit(self) -> Result<()> {
// Commit the write batch
self.db.commit_write_batch(self.batch)?;
if !self.initial_write {
// Start a new compaction in the background
let db = self.db.clone();
let handle = spawn(move || {
db.compact(&CompactConfig {
max_merge_segment_count: available_parallelism()
.map_or(4, |c| max(4, c.get() / 2)),
..COMPACT_CONFIG
})
});
self.compact_join_handle.lock().replace(handle);
}
Ok(())
}
}
impl<'a> ConcurrentWriteBatch<'a> for TurboWriteBatch<'a> {
fn put(&self, key_space: KeySpace, key: WriteBuffer<'_>, value: WriteBuffer<'_>) -> Result<()> {
self.batch
.put(key_space as u32, key.into_static(), value.into())
}
fn delete(&self, key_space: KeySpace, key: WriteBuffer<'_>) -> Result<()> {
self.batch.delete(key_space as u32, key.into_static())
}
unsafe fn flush(&self, key_space: KeySpace) -> Result<()> {
unsafe { self.batch.flush(key_space as u32) }
}
}
impl KeyBase for WriteBuffer<'_> {
fn len(&self) -> usize {
(**self).len()
}
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
for item in &**self {
state.write_u8(*item);
}
}
}
impl StoreKey for WriteBuffer<'_> {
fn write_to(&self, buf: &mut Vec<u8>) {
buf.extend_from_slice(self);
}
}
impl PartialEq for WriteBuffer<'_> {
fn eq(&self, other: &Self) -> bool {
**self == **other
}
}
impl Eq for WriteBuffer<'_> {}
impl Ord for WriteBuffer<'_> {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
(**self).cmp(&**other)
}
}
impl PartialOrd for WriteBuffer<'_> {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
Some(self.cmp(other))
}
}
impl<'l> From<WriteBuffer<'l>> for ValueBuffer<'l> {
fn from(val: WriteBuffer<'l>) -> Self {
match val {
WriteBuffer::Borrowed(b) => ValueBuffer::Borrowed(b),
WriteBuffer::Vec(v) => ValueBuffer::Vec(v),
WriteBuffer::SmallVec(sv) => ValueBuffer::SmallVec(sv),
}
}
}
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