[GitHub] [iceberg] szehon-ho commented on a change in pull request #2415: Spark: Add an action to remove all referenced files

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

szehon-ho commented on a change in pull request #2415:
URL: https://github.com/apache/iceberg/pull/2415#discussion_r647910921



##########
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:
       Oh I see, yea if we can use this code as part of drop, that would be great.  
   
   I did hit issues where drop fails, and leaves behind files but the table is already gone.  In this case, deleting the metadata json last makes good sense for recovery, thanks for the context, I suppose we can add this documentation of the action if not done already.




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