[GitHub] [iotdb] THUMarkLau commented on a diff in pull request #6782: [IOTDB-3771] Fix cannot take snapshot when the data dir and snapshot dir is on different disk

[GitBox <gi...@apache.org>]

THUMarkLau commented on code in PR #6782:
URL: https://github.com/apache/iotdb/pull/6782#discussion_r939766140


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server/src/main/java/org/apache/iotdb/db/engine/snapshot/SnapshotLogger.java:
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@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iotdb.db.engine.snapshot;
+
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+
+public class SnapshotLogger implements AutoCloseable {
+  public static final String SNAPSHOT_LOG_NAME = "snapshot.log";
+  public static final String SPLIT_CHAR = "#";
+
+  private File logFile;
+  private BufferedOutputStream os;
+
+  public SnapshotLogger(File logFile) throws FileNotFoundException {
+    this.logFile = logFile;
+    os = new BufferedOutputStream(new FileOutputStream(logFile));
+  }
+
+  @Override
+  public void close() throws Exception {
+    os.close();
+  }
+
+  public void logFile(String sourceFile, String linkFile) throws IOException {
+    os.write(sourceFile.getBytes(StandardCharsets.UTF_8));
+    os.write(SPLIT_CHAR.getBytes(StandardCharsets.UTF_8));
+    os.write(linkFile.getBytes(StandardCharsets.UTF_8));
+    os.write("\n".getBytes(StandardCharsets.UTF_8));
+    os.flush();
+  }
+
+  public void logSnapshotType(SnapshotType type) throws IOException {
+    os.write(String.valueOf(type).getBytes(StandardCharsets.UTF_8));
+    os.write("\n".getBytes(StandardCharsets.UTF_8));
+    os.flush();
+  }
+
+  public void cleanUpWhenFailed() throws IOException {
+    os.close();
+    Files.delete(logFile.toPath());
+  }
+
+  public static enum SnapshotType {
+    LOCAL_DISK,
+    REMOTE_DISK

Review Comment:
   It is logged when taking snapshot in different disk.



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