openinx commented on a change in pull request #2680:
URL: https://github.com/apache/iceberg/pull/2680#discussion_r656736545



##########
File path: core/src/main/java/org/apache/iceberg/util/RocksDBStructLikeMap.java
##########
@@ -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:
       Currently,  if multiple tasks are located in the same node,  then they 
will use the same rocksdb location. That will mess up the spilled data. We will 
need to create separate rocksdb dir for different tasks even if they are 
located in the same node.




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