aokolnychyi commented on a change in pull request #2437: URL: https://github.com/apache/iceberg/pull/2437#discussion_r610882046
########## File path: spark3/src/main/java/org/apache/iceberg/spark/actions/BaseMigrateTableSparkAction.java ########## @@ -0,0 +1,192 @@ +/* + * 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.Map; +import org.apache.iceberg.Snapshot; +import org.apache.iceberg.SnapshotSummary; +import org.apache.iceberg.Table; +import org.apache.iceberg.actions.BaseMigrateTableActionResult; +import org.apache.iceberg.actions.MigrateTable; +import org.apache.iceberg.exceptions.AlreadyExistsException; +import org.apache.iceberg.exceptions.NoSuchTableException; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.Maps; +import org.apache.iceberg.spark.JobGroupInfo; +import org.apache.iceberg.spark.SparkSessionCatalog; +import org.apache.iceberg.spark.SparkTableUtil; +import org.apache.iceberg.spark.source.StagedSparkTable; +import org.apache.spark.sql.SparkSession; +import org.apache.spark.sql.catalyst.TableIdentifier; +import org.apache.spark.sql.connector.catalog.CatalogPlugin; +import org.apache.spark.sql.connector.catalog.Identifier; +import org.apache.spark.sql.connector.catalog.TableCatalog; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; +import scala.Some; +import scala.collection.JavaConverters; + +/** + * Takes a Spark table in the source catalog and attempts to transform it into an Iceberg + * table in the same location with the same identifier. Once complete the identifier which + * previously referred to a non-Iceberg table will refer to the newly migrated Iceberg + * table. + */ +public class BaseMigrateTableSparkAction + extends BaseTableMigrationSparkAction<MigrateTable, MigrateTable.Result> + implements MigrateTable { + + private static final Logger LOG = LoggerFactory.getLogger(BaseMigrateTableSparkAction.class); + private static final String BACKUP_SUFFIX = "_BACKUP_"; + + private final Identifier backupIdent; + + public BaseMigrateTableSparkAction(SparkSession spark, CatalogPlugin sourceCatalog, Identifier sourceTableIdent) { + super(spark, sourceCatalog, sourceTableIdent, sourceCatalog, sourceTableIdent); + String backupName = sourceTableIdent().name() + BACKUP_SUFFIX; + this.backupIdent = Identifier.of(sourceTableIdent().namespace(), backupName); + } + + @Override + protected MigrateTable self() { + return this; + } + + @Override + public MigrateTable tableProperties(Map<String, String> properties) { + setProperties(properties); + return this; + } + + @Override + public MigrateTable tableProperty(String property, String value) { + setProperty(property, value); + return this; + } + + @Override + public MigrateTable.Result execute() { + JobGroupInfo info = newJobGroupInfo("MIGRATE-TABLE", "MIGRATE-TABLE"); + return withJobGroupInfo(info, this::doExecute); + } + + private MigrateTable.Result doExecute() { + LOG.info("Starting the migration of {} to Iceberg", sourceTableIdent()); + + // move the source table to a new name, halting all modifications and allowing us to stage + // the creation of a new Iceberg table in its place + renameAndBackupSourceTable(); + + StagedSparkTable stagedTable = null; + Table icebergTable; + boolean threw = true; + try { + LOG.info("Staging a new Iceberg table {}", destTableIdent()); + stagedTable = stageDestTable(); + icebergTable = stagedTable.table(); + + LOG.info("Ensuring {} has a valid name mapping", destTableIdent()); + ensureNameMappingPresent(icebergTable); + + Some<String> backupNamespace = Some.apply(backupIdent.namespace()[0]); + TableIdentifier v1BackupIdent = new TableIdentifier(backupIdent.name(), backupNamespace); + String stagingLocation = getMetadataLocation(icebergTable); + LOG.info("Generating Iceberg metadata for {} in {}", destTableIdent(), stagingLocation); + SparkTableUtil.importSparkTable(spark(), v1BackupIdent, icebergTable, stagingLocation); + + LOG.info("Committing staged changes to {}", destTableIdent()); + stagedTable.commitStagedChanges(); + threw = false; + } finally { + if (threw) { + LOG.error("Failed to perform the migration, aborting table creation and restoring the original table"); + + restoreSourceTable(); + + if (stagedTable != null) { + try { + stagedTable.abortStagedChanges(); + } catch (Exception abortException) { + LOG.error("Cannot abort staged changes", abortException); + } + } + } + } + + Snapshot snapshot = icebergTable.currentSnapshot(); + long migratedDataFilesCount = Long.parseLong(snapshot.summary().get(SnapshotSummary.TOTAL_DATA_FILES_PROP)); + LOG.info("Successfully loaded Iceberg metadata for {} files to {}", migratedDataFilesCount, destTableIdent()); + return new BaseMigrateTableActionResult(migratedDataFilesCount); + } + + @Override + protected Map<String, String> targetTableProps() { Review comment: Rebased and updated. -- This is an automated message from the Apache Git Service. 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