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tree_builder: write independent trees concurrently

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This should help high-latency backends. I don't think we'll notice it
at Google because we hide the latency by assuming that the write will
succeed and then we flush it in the background.
This commit is contained in:
Martin von Zweigbergk 2025-04-20 00:13:02 -07:00
parent 291dd567ef
commit 6ba587c5cb
No known key found for this signature in database
1 changed files with 14 additions and 4 deletions
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18
lib/src/tree_builder.rs
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@ -19,6 +19,7 @@ use std::collections::HashMap;
use std::collections::HashSet;
use std::sync::Arc;
use futures::future::try_join_all;
use pollster::FutureExt as _;
use crate::backend;
@ -125,12 +126,13 @@ impl TreeBuilder {
}
let mut new_unblocked = HashSet::new();
// TODO: Writing trees concurrently should help on high-latency backends
let mut writes = vec![];
let mut dir_writes = vec![];
for dir in unblocked {
let tree = trees_to_write.remove(dir).unwrap();
let (parent, basename) = dir.split().unwrap();
let parent_tree = trees_to_write.get_mut(parent).unwrap();
if tree.is_empty() {
let parent_tree = trees_to_write.get_mut(parent).unwrap();
if let Some(TreeValue::Tree(_)) = parent_tree.value(basename) {
parent_tree.remove(basename);
} else {
@ -138,8 +140,8 @@ impl TreeBuilder {
// above)
}
} else {
let tree = store.write_tree(&dir, tree).block_on()?;
parent_tree.set(basename.to_owned(), TreeValue::Tree(tree.id().clone()));
writes.push(store.write_tree(&dir, tree));
dir_writes.push(dir);
}
let parent_blocked_by = blocked_by.get_mut(parent).unwrap();
@ -149,6 +151,14 @@ impl TreeBuilder {
new_unblocked.insert(parent);
}
}
let written = try_join_all(writes).block_on()?;
for (dir, tree) in dir_writes.iter().zip(written) {
let (parent, basename) = dir.split().unwrap();
let parent_tree = trees_to_write.get_mut(parent).unwrap();
parent_tree.set(basename.to_owned(), TreeValue::Tree(tree.id().clone()));
}
unblocked = new_unblocked;
}