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refactor: avoid unnecessary allocation #3747

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refactor: avoid unnecessary allocation #3747

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17 changes: 6 additions & 11 deletions src/common/meta/src/state_store.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,6 @@ use common_procedure::store::util::multiple_value_stream;
use common_procedure::Result as ProcedureResult;
use futures::future::try_join_all;
use futures::StreamExt;
use itertools::Itertools;
use snafu::ResultExt;

use crate::error::Result;
Expand Down Expand Up @@ -80,21 +79,17 @@ fn decode_kv(kv: KeyValue) -> Result<(String, Vec<u8>)> {
Ok((key, value))
}

enum SplitValue {
Single(Vec<u8>),
Multiple(Vec<Vec<u8>>),
enum SplitValue<'a> {
Single(&'a [u8]),
Multiple(Vec<&'a [u8]>),
}

fn split_value(value: Vec<u8>, max_value_size: Option<usize>) -> SplitValue {
fn split_value(value: &[u8], max_value_size: Option<usize>) -> SplitValue<'_> {
if let Some(max_value_size) = max_value_size {
if value.len() <= max_value_size {
SplitValue::Single(value)
} else {
let mut values = vec![];
for chunk in value.into_iter().chunks(max_value_size).into_iter() {
values.push(chunk.collect());
}
SplitValue::Multiple(values)
SplitValue::Multiple(value.chunks(max_value_size).collect::<Vec<_>>())
}
} else {
SplitValue::Single(value)
Expand All @@ -104,7 +99,7 @@ fn split_value(value: Vec<u8>, max_value_size: Option<usize>) -> SplitValue {
#[async_trait]
impl StateStore for KvStateStore {
async fn put(&self, key: &str, value: Vec<u8>) -> ProcedureResult<()> {
let split = split_value(value, self.max_value_size);
let split = split_value(&value, self.max_value_size);
let key = with_prefix(key);
match split {
SplitValue::Single(value) => {
Expand Down