[GitHub] [iceberg] rdblue commented on a change in pull request #2415: Add an action to drop table

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

rdblue commented on a change in pull request #2415:
URL: https://github.com/apache/iceberg/pull/2415#discussion_r639218827



##########
File path: spark/src/main/java/org/apache/iceberg/spark/actions/BaseRemoveFilesSparkAction.java
##########
@@ -0,0 +1,220 @@
+/*
+ * 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.spark.actions;
+
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.Consumer;
+import org.apache.iceberg.HasTableOperations;
+import org.apache.iceberg.Table;
+import org.apache.iceberg.TableMetadata;
+import org.apache.iceberg.TableMetadataParser;
+import org.apache.iceberg.TableOperations;
+import org.apache.iceberg.actions.RemoveFiles;
+import org.apache.iceberg.actions.RemoveFilesActionResult;
+import org.apache.iceberg.exceptions.NotFoundException;
+import org.apache.iceberg.io.FileIO;
+import org.apache.iceberg.relocated.com.google.common.collect.Lists;
+import org.apache.iceberg.spark.JobGroupInfo;
+import org.apache.iceberg.util.PropertyUtil;
+import org.apache.iceberg.util.Tasks;
+import org.apache.spark.sql.Column;
+import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Encoders;
+import org.apache.spark.sql.Row;
+import org.apache.spark.sql.SparkSession;
+import org.apache.spark.sql.functions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * An action that performs the same operation as {@link RemoveFiles} but uses Spark
+ * to determine the files that needs to be deleted. The action uses metadata tables to
+ * find the files to be deleted.
+ * Deletes are performed locally after retrieving the results from the Spark executors.
+ */
+@SuppressWarnings("UnnecessaryAnonymousClass")
+public class BaseRemoveFilesSparkAction
+    extends BaseSparkAction<RemoveFiles, RemoveFiles.Result> implements RemoveFiles {
+  private static final Logger LOG = LoggerFactory.getLogger(BaseRemoveFilesSparkAction.class);
+
+  private static final String DATA_FILE = "Data File";
+  private static final String MANIFEST = "Manifest";
+  private static final String MANIFEST_LIST = "Manifest List";
+  private static final String OTHERS = "Others";
+
+  private static final String STREAM_RESULTS = "stream-results";
+
+  // Creates an executor service that runs each task in the thread that invokes execute/submit.
+  private static final ExecutorService DEFAULT_DELETE_EXECUTOR_SERVICE = null;
+
+  private final Table table;
+  private final TableOperations ops;
+  private final Consumer<String> defaultDelete = new Consumer<String>() {
+    @Override
+    public void accept(String file) {
+      ops.io().deleteFile(file);
+    }
+  };
+
+  private Consumer<String> deleteFunc = defaultDelete;
+  private ExecutorService deleteExecutorService = DEFAULT_DELETE_EXECUTOR_SERVICE;
+
+  public BaseRemoveFilesSparkAction(SparkSession spark, Table table) {

Review comment:
       I like passing the JSON file location, but we would probably want to make it clear that it deletes the whole tree referenced by the metadata file. I don't think that's clear from just the code sample above.




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