risingwave_storage/hummock/
mod.rs

1// Copyright 2025 RisingWave Labs
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15//! Hummock is the state store of the streaming system.
16
17use std::ops::Bound;
18use std::sync::Arc;
19
20use bytes::Bytes;
21use risingwave_hummock_sdk::key::{FullKey, TableKey, UserKeyRangeRef};
22use risingwave_hummock_sdk::sstable_info::SstableInfo;
23use risingwave_hummock_sdk::{HummockEpoch, *};
24
25pub mod block_cache;
26pub use block_cache::*;
27
28pub mod sstable;
29pub use sstable::*;
30
31pub mod compactor;
32mod error;
33pub mod hummock_meta_client;
34pub mod iterator;
35pub mod shared_buffer;
36pub mod sstable_store;
37#[cfg(any(test, feature = "test"))]
38pub mod test_utils;
39pub mod utils;
40pub use utils::MemoryLimiter;
41pub mod backup_reader;
42pub mod event_handler;
43pub mod local_version;
44pub mod observer_manager;
45pub mod store;
46pub use store::*;
47mod validator;
48pub mod value;
49pub mod write_limiter;
50
51pub mod recent_filter;
52pub use recent_filter::*;
53
54pub mod block_stream;
55mod time_travel_version_cache;
56
57mod object_id_manager;
58pub use error::*;
59pub use object_id_manager::*;
60pub use risingwave_common::cache::{CacheableEntry, LookupResult, LruCache};
61pub use validator::*;
62use value::*;
63
64use self::iterator::HummockIterator;
65pub use self::sstable_store::*;
66use crate::mem_table::ImmutableMemtable;
67use crate::monitor::StoreLocalStatistic;
68use crate::store::ReadOptions;
69
70pub async fn get_from_sstable_info(
71    sstable_store_ref: SstableStoreRef,
72    sstable_info: &SstableInfo,
73    full_key: FullKey<&[u8]>,
74    read_options: &ReadOptions,
75    dist_key_hash: Option<u64>,
76    local_stats: &mut StoreLocalStatistic,
77) -> HummockResult<Option<impl HummockIterator>> {
78    let sstable = sstable_store_ref.sstable(sstable_info, local_stats).await?;
79
80    // Bloom filter key is the distribution key, which is no need to be the prefix of pk, and do not
81    // contain `TablePrefix` and `VnodePrefix`.
82    if let Some(hash) = dist_key_hash
83        && !hit_sstable_bloom_filter(
84            &sstable,
85            &(
86                Bound::Included(full_key.user_key),
87                Bound::Included(full_key.user_key),
88            ),
89            hash,
90            local_stats,
91        )
92    {
93        return Ok(None);
94    }
95
96    let mut iter = SstableIterator::create(
97        sstable,
98        sstable_store_ref.clone(),
99        Arc::new(SstableIteratorReadOptions::from_read_options(read_options)),
100        sstable_info,
101    );
102    iter.seek(full_key).await?;
103    // Iterator has sought passed the borders.
104    if !iter.is_valid() {
105        return Ok(None);
106    }
107
108    iter.collect_local_statistic(local_stats);
109
110    // Iterator gets us the key, we tell if it's the key we want
111    // or key next to it.
112    let value = if iter.key().user_key == full_key.user_key {
113        Some(iter)
114    } else {
115        None
116    };
117
118    Ok(value)
119}
120
121pub fn hit_sstable_bloom_filter(
122    sstable_ref: &Sstable,
123    user_key_range: &UserKeyRangeRef<'_>,
124    prefix_hash: u64,
125    local_stats: &mut StoreLocalStatistic,
126) -> bool {
127    local_stats.bloom_filter_check_counts += 1;
128    let may_exist = sstable_ref.may_match_hash(user_key_range, prefix_hash);
129    if !may_exist {
130        local_stats.bloom_filter_true_negative_counts += 1;
131    }
132    may_exist
133}
134
135/// Get `user_value` from `ImmutableMemtable`
136pub fn get_from_batch<'a>(
137    imm: &'a ImmutableMemtable,
138    table_key: TableKey<&[u8]>,
139    read_epoch: HummockEpoch,
140    read_options: &ReadOptions,
141    local_stats: &mut StoreLocalStatistic,
142) -> Option<(HummockValue<&'a Bytes>, EpochWithGap)> {
143    imm.get(table_key, read_epoch, read_options).inspect(|_| {
144        local_stats.get_shared_buffer_hit_counts += 1;
145    })
146}
risingwave_storage/hummock/mod.rs

risingwave_storage/hummock/
mod.rs
