sarvekshayr commented on code in PR #10866:
URL: https://github.com/apache/ozone/pull/10866#discussion_r3654590731


##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/export/ExportFileManager.java:
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@@ -0,0 +1,179 @@
+/*
+ * 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.hadoop.hdds.scm.container.export;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Objects;
+import java.util.UUID;
+import org.apache.commons.io.FileUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Manages on-disk paths and artifacts for container ID export jobs.
+ * Layout under the export directory ({@code {exportDirectory}}, typically 
{@code {scm.db.dirs}/exports}):
+ * <p>
+ * {exportDirectory}/
+ *   {jobId}.in-progress                             // marker while a job is 
running
+ *   container-ids-{scope}-{timestamp}-{jobId}.tar   // completed export 
archive

Review Comment:
   > When this file will be deleted?
   <p><b>When {@code .tar.gz} is deleted:</b> {@link #cleanupFailedArtifacts} 
deletes partial
   archives for failed or cancelled jobs. {@link #start()} deletes partial 
archives for jobs that
   still have an in-progress marker. Completed archives remain on disk until 
the export manager
   evicts the job from memory ({@code maxTerminalJobs} in {@code 
ContainerExportManager}) or an
   operator deletes them manually. After SCM restart, in-memory eviction state 
is lost, so
   completed archives persist until manual cleanup.



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