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A table format for huge analytic datasets
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/*
 * 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.procedures;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import org.apache.iceberg.Table;
import org.apache.iceberg.actions.ExpireSnapshots;
import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
import org.apache.iceberg.relocated.com.google.common.util.concurrent.MoreExecutors;
import org.apache.iceberg.relocated.com.google.common.util.concurrent.ThreadFactoryBuilder;
import org.apache.iceberg.spark.actions.SparkActions;
import org.apache.iceberg.spark.procedures.SparkProcedures.ProcedureBuilder;
import org.apache.iceberg.util.DateTimeUtil;
import org.apache.spark.sql.catalyst.InternalRow;
import org.apache.spark.sql.connector.catalog.Identifier;
import org.apache.spark.sql.connector.catalog.TableCatalog;
import org.apache.spark.sql.connector.iceberg.catalog.ProcedureParameter;
import org.apache.spark.sql.types.DataTypes;
import org.apache.spark.sql.types.Metadata;
import org.apache.spark.sql.types.StructField;
import org.apache.spark.sql.types.StructType;

/**
 * A procedure that expires snapshots in a table.
 *
 * @see SparkActions#expireSnapshots(Table)
 */
public class ExpireSnapshotsProcedure extends BaseProcedure {

  private static final ProcedureParameter[] PARAMETERS = new ProcedureParameter[] {
      ProcedureParameter.required("table", DataTypes.StringType),
      ProcedureParameter.optional("older_than", DataTypes.TimestampType),
      ProcedureParameter.optional("retain_last", DataTypes.IntegerType),
      ProcedureParameter.optional("max_concurrent_deletes", DataTypes.IntegerType)
  };

  private static final StructType OUTPUT_TYPE = new StructType(new StructField[]{
      new StructField("deleted_data_files_count", DataTypes.LongType, true, Metadata.empty()),
      new StructField("deleted_manifest_files_count", DataTypes.LongType, true, Metadata.empty()),
      new StructField("deleted_manifest_lists_count", DataTypes.LongType, true, Metadata.empty())
  });

  public static ProcedureBuilder builder() {
    return new BaseProcedure.Builder() {
      @Override
      protected ExpireSnapshotsProcedure doBuild() {
        return new ExpireSnapshotsProcedure(tableCatalog());
      }
    };
  }

  private ExpireSnapshotsProcedure(TableCatalog tableCatalog) {
    super(tableCatalog);
  }

  @Override
  public ProcedureParameter[] parameters() {
    return PARAMETERS;
  }

  @Override
  public StructType outputType() {
    return OUTPUT_TYPE;
  }

  @Override
  public InternalRow[] call(InternalRow args) {
    Identifier tableIdent = toIdentifier(args.getString(0), PARAMETERS[0].name());
    Long olderThanMillis = args.isNullAt(1) ? null : DateTimeUtil.microsToMillis(args.getLong(1));
    Integer retainLastNum = args.isNullAt(2) ? null : args.getInt(2);
    Integer maxConcurrentDeletes = args.isNullAt(3) ? null : args.getInt(3);

    Preconditions.checkArgument(maxConcurrentDeletes == null || maxConcurrentDeletes > 0,
        "max_concurrent_deletes should have value > 0,  value: " + maxConcurrentDeletes);

    return modifyIcebergTable(tableIdent, table -> {
      ExpireSnapshots action = actions().expireSnapshots(table);

      if (olderThanMillis != null) {
        action.expireOlderThan(olderThanMillis);
      }

      if (retainLastNum != null) {
        action.retainLast(retainLastNum);
      }

      if (maxConcurrentDeletes != null && maxConcurrentDeletes > 0) {
        action.executeDeleteWith(expireService(maxConcurrentDeletes));
      }

      ExpireSnapshots.Result result = action.execute();

      return toOutputRows(result);
    });
  }

  private InternalRow[] toOutputRows(ExpireSnapshots.Result result) {
    InternalRow row = newInternalRow(
        result.deletedDataFilesCount(),
        result.deletedManifestsCount(),
        result.deletedManifestListsCount()
    );
    return new InternalRow[]{row};
  }

  @Override
  public String description() {
    return "ExpireSnapshotProcedure";
  }

  private ExecutorService expireService(int concurrentDeletes) {
    return MoreExecutors.getExitingExecutorService(
        (ThreadPoolExecutor) Executors.newFixedThreadPool(
            concurrentDeletes,
            new ThreadFactoryBuilder()
                .setNameFormat("expire-snapshots-%d")
                .build()));
  }
}