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
57pub use error::*;
58pub use risingwave_common::cache::{CacheableEntry, LookupResult, LruCache};
59pub use validator::*;
60use value::*;
61
62use self::iterator::HummockIterator;
63pub use self::sstable_store::*;
64use crate::mem_table::ImmutableMemtable;
65use crate::monitor::StoreLocalStatistic;
66use crate::store::ReadOptions;
67
68pub async fn get_from_sstable_info(
69    sstable_store_ref: SstableStoreRef,
70    sstable_info: &SstableInfo,
71    full_key: FullKey<&[u8]>,
72    read_options: &ReadOptions,
73    dist_key_hash: Option<u64>,
74    local_stats: &mut StoreLocalStatistic,
75) -> HummockResult<Option<(HummockValue<Bytes>, EpochWithGap)>> {
76    let sstable = sstable_store_ref.sstable(sstable_info, local_stats).await?;
77
78    // Bloom filter key is the distribution key, which is no need to be the prefix of pk, and do not
79    // contain `TablePrefix` and `VnodePrefix`.
80    if let Some(hash) = dist_key_hash
81        && !hit_sstable_bloom_filter(
82            &sstable,
83            &(
84                Bound::Included(full_key.user_key),
85                Bound::Included(full_key.user_key),
86            ),
87            hash,
88            local_stats,
89        )
90    {
91        return Ok(None);
92    }
93
94    let mut iter = SstableIterator::create(
95        sstable,
96        sstable_store_ref.clone(),
97        Arc::new(SstableIteratorReadOptions::from_read_options(read_options)),
98        sstable_info,
99    );
100    iter.seek(full_key).await?;
101    // Iterator has sought passed the borders.
102    if !iter.is_valid() {
103        return Ok(None);
104    }
105    // Iterator gets us the key, we tell if it's the key we want
106    // or key next to it.
107    let value = if iter.key().user_key == full_key.user_key {
108        Some((iter.value().to_bytes(), iter.key().epoch_with_gap))
109    } else {
110        None
111    };
112
113    iter.collect_local_statistic(local_stats);
114
115    Ok(value)
116}
117
118pub fn hit_sstable_bloom_filter(
119    sstable_ref: &Sstable,
120    user_key_range: &UserKeyRangeRef<'_>,
121    prefix_hash: u64,
122    local_stats: &mut StoreLocalStatistic,
123) -> bool {
124    local_stats.bloom_filter_check_counts += 1;
125    let may_exist = sstable_ref.may_match_hash(user_key_range, prefix_hash);
126    if !may_exist {
127        local_stats.bloom_filter_true_negative_counts += 1;
128    }
129    may_exist
130}
131
132/// Get `user_value` from `ImmutableMemtable`
133pub fn get_from_batch(
134    imm: &ImmutableMemtable,
135    table_key: TableKey<&[u8]>,
136    read_epoch: HummockEpoch,
137    read_options: &ReadOptions,
138    local_stats: &mut StoreLocalStatistic,
139) -> Option<(HummockValue<Bytes>, EpochWithGap)> {
140    imm.get(table_key, read_epoch, read_options).inspect(|_| {
141        local_stats.get_shared_buffer_hit_counts += 1;
142    })
143}
risingwave_storage/hummock/mod.rs

risingwave_storage/hummock/
mod.rs
