HDDS-11775. Add tool to create RocksDB checkpoint (#7664)

hadoop-ozone/dist/src/main/smoketest/debug/ozone-debug-ldb.robot

@@ -144,3 +144,9 @@ Test ozone debug ldb scan with filter option failure
     # test filter option for lesser/greater operator on non-numeric field
     ${output} =         Execute And Ignore Error        ozone debug ldb --db=/data/metadata/om.db scan --cf=keyTable --filter="keyName:lesser:k1"
                         Should contain                  ${output}           only on numeric values
+
+Test ozone debug ldb checkpoint command
+     ${output} =         Execute                         ozone debug ldb --db=/data/metadata/om.db checkpoint --output=/data/metadata/checkpoint1.db
+                         Should contain                  ${output}           Created checkpoint at
+     ${output} =         Execute                         ls /data/metadata/checkpoint1.db
+                         Should contain                  ${output}           .sst

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/debug/ldb/Checkpoint.java

@@ -0,0 +1,63 @@
+/*
+ * 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.ozone.debug.ldb;
+
+import org.apache.hadoop.hdds.cli.AbstractSubcommand;
+import org.apache.hadoop.hdds.utils.db.managed.ManagedCheckpoint;
+import org.apache.hadoop.hdds.utils.db.managed.ManagedRocksDB;
+import org.apache.hadoop.ozone.debug.RocksDBUtils;
+import org.rocksdb.ColumnFamilyDescriptor;
+import org.rocksdb.ColumnFamilyHandle;
+import picocli.CommandLine;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.Callable;
+
+/**
+ * Create a checkpoint for a rocksDB.
+ */
+@CommandLine.Command(
+    name = "checkpoint",
+    description = "Create checkpoint for specified db"
+)
+public class Checkpoint extends AbstractSubcommand implements Callable<Void> {
+  @CommandLine.Option(names = {"--output"},
+      required = true,
+      description = "Path to output directory for the checkpoint.")
+  private String outputPath;
+
+  @CommandLine.ParentCommand
+  private RDBParser parent;
+
+  @Override
+  public Void call() throws Exception {
+    List<ColumnFamilyDescriptor> cfDescList =
+        RocksDBUtils.getColumnFamilyDescriptors(parent.getDbPath());
+    final List<ColumnFamilyHandle> cfHandleList = new ArrayList<>();
+
+    // Create checkpoint
+    try (ManagedRocksDB db = ManagedRocksDB.openReadOnly(
+        parent.getDbPath(), cfDescList, cfHandleList)) {
+      ManagedCheckpoint cp = ManagedCheckpoint.create(db);
+      cp.get().createCheckpoint(outputPath);
+      out().println("Created checkpoint at " + outputPath);
+    }
+    return null;
+  }
+}

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/debug/ldb/RDBParser.java

@@ -33,6 +33,7 @@
             DropTable.class,
             ListTables.class,
             ValueSchema.class,
+            Checkpoint.class,
         },
         description = "Parse rocksdb file content")
 @MetaInfServices(DebugSubcommand.class)