kien-truong commented on a change in pull request #2680:
URL: https://github.com/apache/iceberg/pull/2680#discussion_r763604825



##########
File path: core/src/main/java/org/apache/iceberg/util/RocksDBStructLikeMap.java
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@@ -0,0 +1,296 @@
+/*
+ * 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.iceberg.util;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.AbstractMap;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import org.apache.commons.io.FileUtils;
+import org.apache.iceberg.StructLike;
+import org.apache.iceberg.relocated.com.google.common.collect.Sets;
+import org.apache.iceberg.types.Serializer;
+import org.apache.iceberg.types.Serializers;
+import org.apache.iceberg.types.Types;
+import org.rocksdb.Options;
+import org.rocksdb.RocksDB;
+import org.rocksdb.RocksDBException;
+import org.rocksdb.RocksIterator;
+import org.rocksdb.WriteOptions;
+
+public class RocksDBStructLikeMap extends AbstractMap<StructLike, StructLike> 
implements Map<StructLike, StructLike> {
+
+  static {
+    RocksDB.loadLibrary();
+  }
+
+  public static RocksDBStructLikeMap create(String path,

Review comment:
       I think allow changing RocksDB `DBOptions` and `ColumnFamilyOptions` is 
quite important for debugging / tuning OOM issue with RocksDB. Maybe we should 
allow user to supply a config factory, similar to how Flink does with its 
RocksDB state backend.




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