Active Load: Add cleanup for active load listening directories on DataNode first startup (#16854)

* Add cleanup for active load listening directories on DataNode first startup

- Add cleanupListeningDirectories() method in ActiveLoadAgent to clean up all listening directories
- Call cleanup method when DataNode starts for the first time
- Clean up pending, pipe, and failed directories
- Silent execution with minimal logging

* update

* fix

Author: luoluoyuyu

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/service/DataNode.java

@@ -111,6 +111,7 @@
 import org.apache.iotdb.db.storageengine.dataregion.memtable.TsFileProcessor;
 import org.apache.iotdb.db.storageengine.dataregion.wal.WALManager;
 import org.apache.iotdb.db.storageengine.dataregion.wal.utils.WALMode;
+import org.apache.iotdb.db.storageengine.load.active.ActiveLoadAgent;
 import org.apache.iotdb.db.storageengine.rescon.disk.TierManager;
 import org.apache.iotdb.db.subscription.agent.SubscriptionAgent;
 import org.apache.iotdb.db.trigger.executor.TriggerExecutor;
@@ -245,6 +246,8 @@ protected void start() {
         sendRegisterRequestToConfigNode(false);
         saveSecretKey();
         saveHardwareCode();
+        // Clean up active load listening directories on first startup
+        ActiveLoadAgent.cleanupListeningDirectories();
       } else {
         /* Check encrypt magic string */
         try {

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/load/active/ActiveLoadAgent.java

@@ -19,8 +19,21 @@
 
 package org.apache.iotdb.db.storageengine.load.active;
 
+import org.apache.iotdb.commons.utils.FileUtils;
+import org.apache.iotdb.db.conf.IoTDBDescriptor;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
 public class ActiveLoadAgent {
 
+  private static final Logger LOGGER = LoggerFactory.getLogger(ActiveLoadAgent.class);
+
   private final ActiveLoadTsFileLoader activeLoadTsFileLoader;
   private final ActiveLoadDirScanner activeLoadDirScanner;
   private final ActiveLoadMetricsCollector activeLoadMetricsCollector;
@@ -48,4 +61,81 @@ public synchronized void start() {
     activeLoadDirScanner.start();
     activeLoadMetricsCollector.start();
   }
+
+  /**
+   * Clean up all listening directories for active load on DataNode first startup. This method will
+   * clean up all files and subdirectories in the listening directories, including: 1. Pending
+   * directories (configured by load_active_listening_dirs) 2. Pipe directory (for pipe data sync)
+   * 3. Failed directory (for failed files)
+   *
+   * <p>This method is called during DataNode startup and must not throw any exceptions to ensure
+   * startup can proceed normally. All exceptions are caught and logged internally.
+   */
+  public static void cleanupListeningDirectories() {
+    try {
+      final List<String> dirsToClean = new ArrayList<>();
+
+      dirsToClean.addAll(
+          Arrays.asList(IoTDBDescriptor.getInstance().getConfig().getLoadActiveListeningDirs()));
+
+      // Add pipe dir
+      dirsToClean.add(IoTDBDescriptor.getInstance().getConfig().getLoadActiveListeningPipeDir());
+
+      // Add failed dir
+      dirsToClean.add(IoTDBDescriptor.getInstance().getConfig().getLoadActiveListeningFailDir());
+
+      // Clean up each directory
+      for (final String dirPath : dirsToClean) {
+        try {
+          if (dirPath == null || dirPath.isEmpty()) {
+            continue;
+          }
+
+          final File dir = new File(dirPath);
+
+          // Check if directory exists and is a directory
+          // These methods may throw SecurityException if access is denied
+          try {
+            if (!dir.exists() || !dir.isDirectory()) {
+              continue;
+            }
+          } catch (Exception e) {
+            LOGGER.debug("Failed to check directory: {}", dirPath, e);
+            continue;
+          }
+
+          // Only delete contents inside the directory, not the directory itself
+          // listFiles() may throw SecurityException if access is denied
+          File[] files = null;
+          try {
+            files = dir.listFiles();
+          } catch (Exception e) {
+            LOGGER.warn("Failed to list files in directory: {}", dirPath, e);
+            continue;
+          }
+
+          if (files != null) {
+            for (final File file : files) {
+              // FileUtils.deleteFileOrDirectory internally calls file.isDirectory() and
+              // file.listFiles() without try-catch, so exceptions may propagate here.
+              // We need to catch it to prevent one file failure from stopping the cleanup.
+              try {
+                FileUtils.deleteFileOrDirectory(file, true);
+              } catch (Exception e) {
+                LOGGER.debug("Failed to delete file or directory: {}", file.getAbsolutePath(), e);
+              }
+            }
+          }
+        } catch (Exception e) {
+          LOGGER.warn("Failed to cleanup directory: {}", dirPath, e);
+        }
+      }
+
+      LOGGER.info("Cleaned up active load listening directories");
+    } catch (Throwable t) {
+      // Catch all exceptions and errors (including OutOfMemoryError, etc.)
+      // to ensure startup process is not affected
+      LOGGER.warn("Unexpected error during cleanup of active load listening directories", t);
+    }
+  }
 }