vikramahuja1001 commented on a change in pull request #4203: URL: https://github.com/apache/carbondata/pull/4203#discussion_r690044509
########## File path: integration/spark/src/main/scala/org/apache/spark/sql/execution/command/management/CarbonDeleteLoadByRemainNumberCommand.scala ########## @@ -0,0 +1,79 @@ +/* + * 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.spark.sql.execution.command.management + +import org.apache.spark.sql.{CarbonEnv, Row, SparkSession} +import org.apache.spark.sql.execution.command.{Checker, DataCommand} +import org.apache.carbondata.api.CarbonStore +import org.apache.carbondata.common.exceptions.sql.MalformedCarbonCommandException +import org.apache.carbondata.core.exception.ConcurrentOperationException +import org.apache.carbondata.core.statusmanager.{SegmentStatus, SegmentStatusManager} +import org.apache.carbondata.events.{DeleteSegmentByIdPostEvent, DeleteSegmentByIdPreEvent, withEvents} + +/** + * A command for delete by remaining number. + * In general, keep the latest segment. + * + * @param remaining expected remaining quantity after deletion + */ +case class CarbonDeleteLoadByRemainNumberCommand( + remaining: String, + databaseNameOp: Option[String], + tableName: String) + extends DataCommand { + + override def processData(sparkSession: SparkSession): Seq[Row] = { + Checker.validateTableExists(databaseNameOp, tableName, sparkSession) + val carbonTable = CarbonEnv.getCarbonTable(databaseNameOp, tableName)(sparkSession) + setAuditTable(carbonTable) + setAuditInfo(Map("remaining number" -> remaining)) + if (!carbonTable.getTableInfo.isTransactionalTable) { + throw new MalformedCarbonCommandException("Unsupported operation on non transactional table") + } + + // if insert overwrite in progress, do not allow delete segment + if (SegmentStatusManager.isOverwriteInProgressInTable(carbonTable)) { + throw new ConcurrentOperationException(carbonTable, "insert overwrite", "delete segment") + } + + val segments = CarbonStore.readSegments(carbonTable.getTablePath, showHistory = false, None) + if (segments.length == remaining.toInt) { + return Seq.empty + } + + // Through the remaining number, get the delete id + val deleteSegmentIds = segments.filter(segment => segment.getSegmentStatus != SegmentStatus.MARKED_FOR_DELETE) Review comment: Instead of filtering out MFD segments, can only take success and compacted segments -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: dev-unsubscr...@carbondata.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
