[GitHub] [carbondata] NamanRastogi commented on a change in pull request #3146: [CARBONDATA-3318] Added PreAgg & Bloom Event-Listener for ShowCacheCommmand

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NamanRastogi commented on a change in pull request #3146: [CARBONDATA-3318]  Added PreAgg & Bloom Event-Listener for ShowCacheCommmand
URL: https://github.com/apache/carbondata/pull/3146#discussion_r267274209
 
 

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 File path: integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/cache/DropCacheEventListeners.scala
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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.spark.sql.execution.command.cache
+
+import scala.collection.JavaConverters._
+import scala.collection.mutable
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.sql.CarbonEnv
+import org.apache.spark.sql.catalyst.TableIdentifier
+import org.apache.spark.sql.execution.command.cache.DropCachePreAggEventListener.LOGGER
+
+import org.apache.carbondata.common.logging.LogServiceFactory
+import org.apache.carbondata.core.cache.{Cacheable, CacheProvider}
+import org.apache.carbondata.core.constants.CarbonCommonConstants
+import org.apache.carbondata.core.datamap.DataMapStoreManager
+import org.apache.carbondata.datamap.bloom.{BloomCacheKeyValue, BloomCoarseGrainDataMapFactory}
+import org.apache.carbondata.events.{DropCacheEvent, Event, OperationContext, OperationEventListener}
+import org.apache.carbondata.processing.merger.CarbonDataMergerUtil
+
+object DropCachePreAggEventListener extends OperationEventListener {
+
+  val LOGGER = LogServiceFactory.getLogService(this.getClass.getCanonicalName)
+
+  /**
+   * Called on a specified event occurrence
+   *
+   * @param event
+   * @param operationContext
+   */
+  override protected def onEvent(event: Event, operationContext: OperationContext): Unit = {
+    event match {
+      case dropCacheEvent: DropCacheEvent =>
+        val carbonTable = dropCacheEvent.carbonTable
+        val sparkSession = dropCacheEvent.sparkSession
+        val internalCall = dropCacheEvent.internalCall
+        if (carbonTable.isChildDataMap && !internalCall) {
+          throw new UnsupportedOperationException("Operation not allowed on child table.")
+        }
+
+        if (carbonTable.hasDataMapSchema) {
+          val childrenSchemas = carbonTable.getTableInfo.getDataMapSchemaList.asScala
+            .filter(_.getRelationIdentifier != null)
+          for (childSchema <- childrenSchemas) {
+            val childTable =
+              CarbonEnv.getCarbonTable(
+                TableIdentifier(childSchema.getRelationIdentifier.getTableName,
+                  Some(childSchema.getRelationIdentifier.getDatabaseName)))(sparkSession)
+            try {
+              val dropCacheCommandForChildTable =
+                CarbonDropCacheCommand(
+                  TableIdentifier(childTable.getTableName, Some(childTable.getDatabaseName)),
+                  internalCall = true)
+              dropCacheCommandForChildTable.processMetadata(sparkSession)
+            }
+            catch {
+              case e: Exception =>
+                LOGGER.error(
+                  s"Clean cache for PreAgg table ${childTable.getTableName} failed.", e)
+            }
+          }
+        }
+    }
+  }
+}
+
+
+object DropCacheBloomEventListener extends OperationEventListener {
+
+  val LOGGER = LogServiceFactory.getLogService(this.getClass.getCanonicalName)
+
+  /**
+   * Called on a specified event occurrence
+   *
+   * @param event
+   * @param operationContext
+   */
+  override protected def onEvent(event: Event, operationContext: OperationContext): Unit = {
+    event match {
+      case dropCacheEvent: DropCacheEvent =>
+        val carbonTable = dropCacheEvent.carbonTable
+        val sparkSession = dropCacheEvent.sparkSession
+        val cache = CacheProvider.getInstance().getCarbonCache
+        val currentTableSizeMap = operationContext.getProperty(carbonTable.getTableUniqueName)
+          .asInstanceOf[mutable.Map[String, (String, Long, Long)]]
+
+        val datamaps = DataMapStoreManager.getInstance().getDataMapSchemasOfTable(carbonTable)
+          .asScala
+        val segments = CarbonDataMergerUtil
+          .getValidSegmentList(carbonTable.getAbsoluteTableIdentifier).asScala
+
+        datamaps.foreach {
+          datamap =>
+            try {
+              val shardPaths = segments.flatMap {
 
 Review comment:
   Done.

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