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-rw-r--r--src/block/layout.rs8
-rw-r--r--src/block/manager.rs22
-rw-r--r--src/block/repair.rs90
-rw-r--r--src/garage/cli/structs.rs3
-rw-r--r--src/garage/repair/online.rs6
5 files changed, 115 insertions, 14 deletions
diff --git a/src/block/layout.rs b/src/block/layout.rs
index 8098654f..e32ef785 100644
--- a/src/block/layout.rs
+++ b/src/block/layout.rs
@@ -252,6 +252,14 @@ impl DataLayout {
path.push(hex::encode(&hash.as_slice()[1..2]));
path
}
+
+ pub(crate) fn without_secondary_locations(&self) -> Self {
+ Self {
+ data_dirs: self.data_dirs.clone(),
+ part_prim: self.part_prim.clone(),
+ part_sec: self.part_sec.iter().map(|_| vec![]).collect::<Vec<_>>(),
+ }
+ }
}
impl InitialFormat for DataLayout {
diff --git a/src/block/manager.rs b/src/block/manager.rs
index 0081f46c..e0fbfe74 100644
--- a/src/block/manager.rs
+++ b/src/block/manager.rs
@@ -3,7 +3,7 @@ use std::pin::Pin;
use std::sync::Arc;
use std::time::Duration;
-use arc_swap::ArcSwapOption;
+use arc_swap::{ArcSwap, ArcSwapOption};
use async_trait::async_trait;
use bytes::Bytes;
use rand::prelude::*;
@@ -83,7 +83,9 @@ pub struct BlockManager {
/// Directory/ies in which block are stored
pub data_dir: DataDirEnum,
/// Data layout
- pub(crate) data_layout: DataLayout,
+ pub(crate) data_layout: ArcSwap<DataLayout>,
+ /// Data layout persister
+ pub(crate) data_layout_persister: Persister<DataLayout>,
data_fsync: bool,
compression_level: Option<i32>,
@@ -129,9 +131,9 @@ impl BlockManager {
system: Arc<System>,
) -> Result<Arc<Self>, Error> {
// Load or compute layout, i.e. assignment of data blocks to the different data directories
- let layout_persister: Persister<DataLayout> =
+ let data_layout_persister: Persister<DataLayout> =
Persister::new(&system.metadata_dir, "data_layout");
- let data_layout = match layout_persister.load() {
+ let data_layout = match data_layout_persister.load() {
Ok(mut layout) => {
layout
.update(&data_dir)
@@ -140,7 +142,7 @@ impl BlockManager {
}
Err(_) => DataLayout::initialize(&data_dir).ok_or_message("invalid data_dir config")?,
};
- layout_persister
+ data_layout_persister
.save(&data_layout)
.expect("cannot save data_layout");
@@ -168,7 +170,8 @@ impl BlockManager {
let block_manager = Arc::new(Self {
replication,
data_dir,
- data_layout,
+ data_layout: ArcSwap::new(Arc::new(data_layout)),
+ data_layout_persister,
data_fsync,
compression_level,
mutation_lock: vec![(); MUTEX_COUNT]
@@ -606,9 +609,10 @@ impl BlockManager {
/// Find the path where a block is currently stored
pub(crate) async fn find_block(&self, hash: &Hash) -> Option<DataBlockPath> {
- let dirs = Some(self.data_layout.primary_block_dir(hash))
+ let data_layout = self.data_layout.load_full();
+ let dirs = Some(data_layout.primary_block_dir(hash))
.into_iter()
- .chain(self.data_layout.secondary_block_dirs(hash));
+ .chain(data_layout.secondary_block_dirs(hash));
let filename = hex::encode(hash.as_ref());
for dir in dirs {
@@ -682,7 +686,7 @@ impl BlockManagerLocked {
let compressed = data.is_compressed();
let data = data.inner_buffer();
- let directory = mgr.data_layout.primary_block_dir(hash);
+ let directory = mgr.data_layout.load().primary_block_dir(hash);
let mut tgt_path = directory.clone();
tgt_path.push(hex::encode(hash));
diff --git a/src/block/repair.rs b/src/block/repair.rs
index a7c90d4f..1bea9f09 100644
--- a/src/block/repair.rs
+++ b/src/block/repair.rs
@@ -519,6 +519,86 @@ impl Worker for ScrubWorker {
}
// ---- ---- ----
+// THIRD KIND OF REPAIR: REBALANCING DATA BLOCKS
+// between multiple storage locations.
+// This is a one-shot repair operation that can be launched,
+// checks everything, and then exits.
+// ---- ---- ----
+
+pub struct RebalanceWorker {
+ manager: Arc<BlockManager>,
+ block_iter: BlockStoreIterator,
+ moved: usize,
+ moved_bytes: usize,
+}
+
+impl RebalanceWorker {
+ pub fn new(manager: Arc<BlockManager>) -> Self {
+ let block_iter = BlockStoreIterator::new(&manager);
+ Self {
+ manager,
+ block_iter,
+ moved: 0,
+ moved_bytes: 0,
+ }
+ }
+}
+
+#[async_trait]
+impl Worker for RebalanceWorker {
+ fn name(&self) -> String {
+ "Block rebalance worker".into()
+ }
+
+ fn status(&self) -> WorkerStatus {
+ WorkerStatus {
+ progress: Some(format!("{:.2}%", self.block_iter.progress() * 100.)),
+ freeform: vec![
+ format!("Blocks moved: {}", self.moved),
+ format!("Bytes moved: {}", self.moved_bytes),
+ ],
+ ..Default::default()
+ }
+ }
+
+ async fn work(&mut self, _must_exit: &mut watch::Receiver<bool>) -> Result<WorkerState, Error> {
+ if let Some((path, hash)) = self.block_iter.next().await? {
+ let prim_loc = self.manager.data_layout.load().primary_block_dir(&hash);
+ if path.parent().expect("no parent?") != prim_loc {
+ // block is not in its primary location,
+ // move it there (reading and re-writing does the trick)
+ let data = self.manager.read_block(&hash).await?;
+ self.manager.write_block(&hash, &data).await?;
+ self.moved += 1;
+ self.moved_bytes += data.inner_buffer().len();
+ }
+ Ok(WorkerState::Busy)
+ } else {
+ // all blocks are in their primary location:
+ // - the ones we moved now are
+ // - the ones written in the meantime always were, because we only
+ // write to primary locations
+ // so we can safely remove all secondary locations from the data layout
+ let new_layout = self
+ .manager
+ .data_layout
+ .load_full()
+ .without_secondary_locations();
+ self.manager
+ .data_layout_persister
+ .save_async(&new_layout)
+ .await?;
+ self.manager.data_layout.store(Arc::new(new_layout));
+ Ok(WorkerState::Done)
+ }
+ }
+
+ async fn wait_for_work(&mut self) -> WorkerState {
+ unreachable!()
+ }
+}
+
+// ---- ---- ----
// UTILITY FOR ENUMERATING THE BLOCK STORE
// ---- ---- ----
@@ -526,16 +606,16 @@ const PROGRESS_FP: u64 = 1_000_000_000;
impl BlockStoreIterator {
fn new(manager: &BlockManager) -> Self {
- let min_cap = manager
- .data_layout
+ let data_layout = manager.data_layout.load_full();
+
+ let min_cap = data_layout
.data_dirs
.iter()
.filter_map(|x| x.capacity())
.min()
.unwrap_or(0);
- let sum_cap = manager
- .data_layout
+ let sum_cap = data_layout
.data_dirs
.iter()
.map(|x| x.capacity().unwrap_or(min_cap /* approximation */))
@@ -543,7 +623,7 @@ impl BlockStoreIterator {
let mut cum_cap = 0;
let mut todo = vec![];
- for dir in manager.data_layout.data_dirs.iter() {
+ for dir in data_layout.data_dirs.iter() {
let cap = match dir.state {
DataDirState::Active { capacity } => capacity,
_ => min_cap,
diff --git a/src/garage/cli/structs.rs b/src/garage/cli/structs.rs
index 9ca4a059..fd37a24e 100644
--- a/src/garage/cli/structs.rs
+++ b/src/garage/cli/structs.rs
@@ -471,6 +471,9 @@ pub enum RepairWhat {
#[structopt(subcommand)]
cmd: ScrubCmd,
},
+ /// Rebalance data blocks among storage locations
+ #[structopt(name = "rebalance", version = garage_version())]
+ Rebalance,
}
#[derive(Serialize, Deserialize, StructOpt, Debug, Eq, PartialEq, Clone)]
diff --git a/src/garage/repair/online.rs b/src/garage/repair/online.rs
index abfaf9f9..9e4de873 100644
--- a/src/garage/repair/online.rs
+++ b/src/garage/repair/online.rs
@@ -70,6 +70,12 @@ pub async fn launch_online_repair(
info!("Sending command to scrub worker: {:?}", cmd);
garage.block_manager.send_scrub_command(cmd).await?;
}
+ RepairWhat::Rebalance => {
+ info!("Rebalancing the stored blocks among storage locations");
+ bg.spawn_worker(garage_block::repair::RebalanceWorker::new(
+ garage.block_manager.clone(),
+ ));
+ }
}
Ok(())
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-28 02:12:44 +0000