common_meta/region_registry.rs
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// Copyright 2023 Greptime Team
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::collections::hash_map::Entry;
use std::collections::HashMap;
use std::sync::{Arc, RwLock};
use common_telemetry::warn;
use store_api::storage::RegionId;
use crate::datanode::RegionManifestInfo;
/// Represents information about a leader region in the cluster.
/// Contains the datanode id where the leader is located,
/// and the current manifest version.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct LeaderRegion {
pub datanode_id: u64,
pub manifest: LeaderRegionManifestInfo,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum LeaderRegionManifestInfo {
Mito {
manifest_version: u64,
flushed_entry_id: u64,
},
Metric {
data_manifest_version: u64,
data_flushed_entry_id: u64,
metadata_manifest_version: u64,
metadata_flushed_entry_id: u64,
},
}
impl From<RegionManifestInfo> for LeaderRegionManifestInfo {
fn from(value: RegionManifestInfo) -> Self {
match value {
RegionManifestInfo::Mito {
manifest_version,
flushed_entry_id,
} => LeaderRegionManifestInfo::Mito {
manifest_version,
flushed_entry_id,
},
RegionManifestInfo::Metric {
data_manifest_version,
data_flushed_entry_id,
metadata_manifest_version,
metadata_flushed_entry_id,
} => LeaderRegionManifestInfo::Metric {
data_manifest_version,
data_flushed_entry_id,
metadata_manifest_version,
metadata_flushed_entry_id,
},
}
}
}
impl LeaderRegionManifestInfo {
/// Returns the manifest version of the leader region.
pub fn manifest_version(&self) -> u64 {
match self {
LeaderRegionManifestInfo::Mito {
manifest_version, ..
} => *manifest_version,
LeaderRegionManifestInfo::Metric {
data_manifest_version,
..
} => *data_manifest_version,
}
}
/// Returns the flushed entry id of the leader region.
pub fn flushed_entry_id(&self) -> u64 {
match self {
LeaderRegionManifestInfo::Mito {
flushed_entry_id, ..
} => *flushed_entry_id,
LeaderRegionManifestInfo::Metric {
data_flushed_entry_id,
..
} => *data_flushed_entry_id,
}
}
/// Returns the minimum flushed entry id of the leader region.
/// It is used to determine the minimum flushed entry id that can be pruned in remote wal.
pub fn min_flushed_entry_id(&self) -> u64 {
match self {
LeaderRegionManifestInfo::Mito {
flushed_entry_id, ..
} => *flushed_entry_id,
LeaderRegionManifestInfo::Metric {
data_flushed_entry_id,
metadata_flushed_entry_id,
..
} => (*data_flushed_entry_id).min(*metadata_flushed_entry_id),
}
}
}
pub type LeaderRegionRegistryRef = Arc<LeaderRegionRegistry>;
/// Registry that maintains a mapping of all leader regions in the cluster.
/// Tracks which datanode is hosting the leader for each region and the corresponding
/// manifest version.
#[derive(Default)]
pub struct LeaderRegionRegistry {
inner: RwLock<HashMap<RegionId, LeaderRegion>>,
}
impl LeaderRegionRegistry {
/// Creates a new empty leader region registry.
pub fn new() -> Self {
Self {
inner: RwLock::new(HashMap::new()),
}
}
/// Gets the leader region for the given region ids.
pub fn batch_get<I: Iterator<Item = RegionId>>(
&self,
region_ids: I,
) -> HashMap<RegionId, LeaderRegion> {
let inner = self.inner.read().unwrap();
region_ids
.into_iter()
.flat_map(|region_id| {
inner
.get(®ion_id)
.map(|leader_region| (region_id, *leader_region))
})
.collect::<HashMap<_, _>>()
}
/// Puts the leader regions into the registry.
pub fn batch_put(&self, key_values: Vec<(RegionId, LeaderRegion)>) {
let mut inner = self.inner.write().unwrap();
for (region_id, leader_region) in key_values {
match inner.entry(region_id) {
Entry::Vacant(entry) => {
entry.insert(leader_region);
}
Entry::Occupied(mut entry) => {
let manifest_version = entry.get().manifest.manifest_version();
if manifest_version > leader_region.manifest.manifest_version() {
warn!(
"Received a leader region with a smaller manifest version than the existing one, ignore it. region: {}, existing_manifest_version: {}, new_manifest_version: {}",
region_id,
manifest_version,
leader_region.manifest.manifest_version()
);
} else {
entry.insert(leader_region);
}
}
}
}
}
pub fn batch_delete<I: Iterator<Item = RegionId>>(&self, region_ids: I) {
let mut inner = self.inner.write().unwrap();
for region_id in region_ids {
inner.remove(®ion_id);
}
}
/// Resets the registry to an empty state.
pub fn reset(&self) {
let mut inner = self.inner.write().unwrap();
inner.clear();
}
}