[GitHub] [iceberg] RussellSpitzer commented on a change in pull request #2314: Spark: Refactor action for expiring snapshots

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RussellSpitzer commented on a change in pull request #2314:
URL: https://github.com/apache/iceberg/pull/2314#discussion_r592779843



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File path: spark/src/main/java/org/apache/iceberg/spark/actions/BaseExpireSnapshotsSparkAction.java
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@@ -0,0 +1,240 @@
+/*
+ * 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.Iterator;
+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.TableOperations;
+import org.apache.iceberg.actions.BaseExpireSnapshotsActionResult;
+import org.apache.iceberg.actions.BaseSparkAction;
+import org.apache.iceberg.actions.ExpireSnapshots;
+import org.apache.iceberg.exceptions.NotFoundException;
+import org.apache.iceberg.exceptions.ValidationException;
+import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+import org.apache.iceberg.relocated.com.google.common.collect.Sets;
+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.Row;
+import org.apache.spark.sql.SparkSession;
+import org.apache.spark.sql.functions;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.apache.iceberg.TableProperties.GC_ENABLED;
+import static org.apache.iceberg.TableProperties.GC_ENABLED_DEFAULT;
+
+/**
+ * An action that performs the same operation as {@link org.apache.iceberg.ExpireSnapshots} but uses Spark
+ * to determine the delta in files between the pre and post-expiration table metadata. All of the same
+ * restrictions of {@link org.apache.iceberg.ExpireSnapshots} also apply to this action.
+ * <p>
+ * This action first leverages {@link org.apache.iceberg.ExpireSnapshots} to expire snapshots and then
+ * uses metadata tables to find files that can be safely deleted. This is done by anti-joining two Datasets
+ * that contain all manifest and data files before and after the expiration. The snapshot expiration
+ * will be fully committed before any deletes are issued.
+ * <p>
+ * This operation performs a shuffle so the parallelism can be controlled through 'spark.sql.shuffle.partitions'.
+ * <p>
+ * Deletes are still performed locally after retrieving the results from the Spark executors.
+ */
+@SuppressWarnings("UnnecessaryAnonymousClass")
+public class BaseExpireSnapshotsSparkAction

Review comment:
       I agree with @aokolnychyi 's reasoning here as I had to do a lot of those static methods as some of our actions could descend from the base class and other couldn't, I'd prefer each frame work be allowed to have it's own base class while shared logic belongs to a class in the "core module" and either is accessed through composition or pure functions




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