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(crate) mod vector;
58
59mod object_id_manager;
60pub use error::*;
61pub use object_id_manager::*;
62pub use risingwave_common::cache::{CacheableEntry, LookupResult, LruCache};
63pub use validator::*;
64use value::*;
65
66use self::iterator::HummockIterator;
67pub use self::sstable_store::*;
68use crate::mem_table::ImmutableMemtable;
69use crate::monitor::StoreLocalStatistic;
70use crate::store::ReadOptions;
71
72pub async fn get_from_sstable_info(
73    sstable_store_ref: SstableStoreRef,
74    sstable_info: &SstableInfo,
75    full_key: FullKey<&[u8]>,
76    read_options: &ReadOptions,
77    dist_key_hash: Option<u64>,
78    local_stats: &mut StoreLocalStatistic,
79) -> HummockResult<Option<impl HummockIterator>> {
80    let sstable = sstable_store_ref.sstable(sstable_info, local_stats).await?;
81
82    // Bloom filter key is the distribution key, which is no need to be the prefix of pk, and do not
83    // contain `TablePrefix` and `VnodePrefix`.
84    if let Some(hash) = dist_key_hash
85        && !hit_sstable_bloom_filter(
86            &sstable,
87            &(
88                Bound::Included(full_key.user_key),
89                Bound::Included(full_key.user_key),
90            ),
91            hash,
92            local_stats,
93        )
94    {
95        return Ok(None);
96    }
97
98    let mut iter = SstableIterator::create(
99        sstable,
100        sstable_store_ref.clone(),
101        Arc::new(SstableIteratorReadOptions::from_read_options(read_options)),
102        sstable_info,
103    );
104    iter.seek(full_key).await?;
105    // Iterator has sought passed the borders.
106    if !iter.is_valid() {
107        return Ok(None);
108    }
109
110    iter.collect_local_statistic(local_stats);
111
112    // Iterator gets us the key, we tell if it's the key we want
113    // or key next to it.
114    let value = if iter.key().user_key == full_key.user_key {
115        Some(iter)
116    } else {
117        None
118    };
119
120    Ok(value)
121}
122
123pub fn hit_sstable_bloom_filter(
124    sstable_ref: &Sstable,
125    user_key_range: &UserKeyRangeRef<'_>,
126    prefix_hash: u64,
127    local_stats: &mut StoreLocalStatistic,
128) -> bool {
129    local_stats.bloom_filter_check_counts += 1;
130    let may_exist = sstable_ref.may_match_hash(user_key_range, prefix_hash);
131    if !may_exist {
132        local_stats.bloom_filter_true_negative_counts += 1;
133    }
134    may_exist
135}
136
137/// Get `user_value` from `ImmutableMemtable`
138pub fn get_from_batch<'a>(
139    imm: &'a ImmutableMemtable,
140    table_key: TableKey<&[u8]>,
141    read_epoch: HummockEpoch,
142    read_options: &ReadOptions,
143    local_stats: &mut StoreLocalStatistic,
144) -> Option<(HummockValue<&'a Bytes>, EpochWithGap)> {
145    imm.get(table_key, read_epoch, read_options).inspect(|_| {
146        local_stats.get_shared_buffer_hit_counts += 1;
147    })
148}
risingwave_storage/hummock/mod.rs

risingwave_storage/hummock/
mod.rs
