feat(batch): clean spill directory at the start

src/batch/src/lib.rs

@@ -38,7 +38,7 @@ pub mod execution;
 pub mod executor;
 pub mod monitor;
 pub mod rpc;
-mod spill;
+pub mod spill;
 pub mod task;
 pub mod worker_manager;
 

src/batch/src/spill/spill_op.rs

@@ -14,6 +14,7 @@
 
 use std::hash::BuildHasher;
 use std::ops::{Deref, DerefMut};
+use std::sync::LazyLock;
 
 use anyhow::anyhow;
 use futures_async_stream::try_stream;
@@ -25,6 +26,7 @@ use prost::Message;
 use risingwave_common::array::DataChunk;
 use risingwave_pb::data::DataChunk as PbDataChunk;
 use thiserror_ext::AsReport;
+use tokio::sync::Mutex;
 use twox_hash::XxHash64;
 
 use crate::error::{BatchError, Result};
@@ -58,6 +60,24 @@ impl SpillOp {
         Ok(SpillOp { op })
     }
 
+    pub async fn clean_spill_directory() -> opendal::Result<()> {
+        static LOCK: LazyLock<Mutex<usize>> = LazyLock::new(|| Mutex::new(0));
+        let _guard = LOCK.lock().await;
+
+        let spill_dir =
+            std::env::var(RW_BATCH_SPILL_DIR_ENV).unwrap_or_else(|_| DEFAULT_SPILL_DIR.to_string());
+        let root = format!("/{}/{}/", spill_dir, RW_MANAGED_SPILL_DIR);
+
+        let mut builder = Fs::default();
+        builder.root(&root);
+
+        let op: Operator = Operator::new(builder)?
+            .layer(RetryLayer::default())
+            .finish();
+
+        op.remove_all("/").await
+    }
+
     pub async fn writer_with(&self, name: &str) -> Result<opendal::Writer> {
         Ok(self
             .op

src/compute/src/server.rs

@@ -20,6 +20,7 @@ use risingwave_batch::monitor::{
     GLOBAL_BATCH_EXECUTOR_METRICS, GLOBAL_BATCH_MANAGER_METRICS, GLOBAL_BATCH_TASK_METRICS,
 };
 use risingwave_batch::rpc::service::task_service::BatchServiceImpl;
+use risingwave_batch::spill::spill_op::SpillOp;
 use risingwave_batch::task::{BatchEnvironment, BatchManager};
 use risingwave_common::config::{
     load_config, AsyncStackTraceOption, MetricLevel, StorageMemoryConfig,
@@ -391,6 +392,9 @@ pub async fn compute_node_serve(
         tracing::info!("Telemetry didn't start due to config");
     }
 
+    // Clean up the spill directory.
+    SpillOp::clean_spill_directory().await.unwrap();
+
     let (shutdown_send, mut shutdown_recv) = tokio::sync::oneshot::channel::<()>();
     let join_handle = tokio::spawn(async move {
         tonic::transport::Server::builder()

src/frontend/src/session.rs

@@ -20,6 +20,7 @@ use std::sync::atomic::{AtomicI32, Ordering};
 use std::sync::{Arc, Weak};
 use std::time::{Duration, Instant};
 
+use anyhow::anyhow;
 use bytes::Bytes;
 use either::Either;
 use parking_lot::{Mutex, RwLock, RwLockReadGuard};
@@ -34,6 +35,7 @@ use pgwire::pg_server::{
 };
 use pgwire::types::{Format, FormatIterator};
 use rand::RngCore;
+use risingwave_batch::spill::spill_op::SpillOp;
 use risingwave_batch::task::{ShutdownSender, ShutdownToken};
 use risingwave_batch::worker_manager::worker_node_manager::{
     WorkerNodeManager, WorkerNodeManagerRef,
@@ -401,6 +403,11 @@ impl FrontendEnv {
         });
         join_handles.push(join_handle);
 
+        // Clean up the spill directory.
+        SpillOp::clean_spill_directory()
+            .await
+            .map_err(|err| anyhow!(err))?;
+
         let total_memory_bytes = resource_util::memory::system_memory_available_bytes();
         let heap_profiler =
             HeapProfiler::new(total_memory_bytes, config.server.heap_profiling.clone());