ArafatKhan2198 commented on code in PR #4880: URL: https://github.com/apache/ozone/pull/4880#discussion_r1237962962
########## hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/tasks/ScmTableCountTask.java: ########## @@ -0,0 +1,217 @@ +/* + * 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 + * <p> + * http://www.apache.org/licenses/LICENSE-2.0 + * <p> + * 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.hadoop.ozone.recon.tasks; + +import com.google.common.collect.Iterators; +import org.apache.hadoop.hdds.utils.db.DBStore; +import org.apache.hadoop.hdds.utils.db.Table; +import org.apache.hadoop.hdds.utils.db.TableIterator; +import org.apache.hadoop.ozone.recon.scm.ReconScmTask; +import org.apache.hadoop.ozone.recon.scm.ReconStorageContainerManagerFacade; +import org.hadoop.ozone.recon.schema.UtilizationSchemaDefinition; +import org.hadoop.ozone.recon.schema.tables.daos.ReconTaskStatusDao; +import org.hadoop.ozone.recon.schema.tables.daos.ScmTableCountDao; +import org.hadoop.ozone.recon.schema.tables.pojos.ScmTableCount; +import org.jooq.DSLContext; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; + +import java.util.HashMap; +import java.util.ArrayList; +import java.util.List; +import java.util.Iterator; +import java.util.Collection; +import java.util.Map; +import java.util.concurrent.locks.ReadWriteLock; +import java.util.concurrent.locks.ReentrantReadWriteLock; + +import static org.apache.hadoop.hdds.scm.metadata.SCMDBDefinition.DELETED_BLOCKS; +import static org.hadoop.ozone.recon.schema.UtilizationSchemaDefinition.SCM_TABLE_COUNT_TABLE_NAME; + + +/** + * Any background task that tracks SCM's table counts. + */ +public class ScmTableCountTask extends ReconScmTask { + + private static final Logger LOG = + LoggerFactory.getLogger(ScmTableCountTask.class); + + private final DBStore scmDBStore; + private final ScmTableCountDao scmTableCountDao; + private final DSLContext dslContext; + private final long interval; + private ReadWriteLock lock = new ReentrantReadWriteLock(true); + private static final long NANOSECONDS_IN_MILLISECOND = 1_000_000; + + public ScmTableCountTask(ReconStorageContainerManagerFacade reconSCM, + ReconTaskStatusDao reconTaskStatusDao, + ReconTaskConfig reconTaskConfig, + ScmTableCountDao scmTableCountDao, + UtilizationSchemaDefinition schemaDefinition) { + super(reconTaskStatusDao); + this.scmDBStore = reconSCM.getScmDBStore(); + this.scmTableCountDao = scmTableCountDao; + this.dslContext = schemaDefinition.getDSLContext(); + this.interval = reconTaskConfig.getScmTableCountTaskInterval().toMillis(); + } + + @Override + protected synchronized void run() { + try { + while (canRun()) { + wait(interval); + runTableCountProcess(); + } + } catch (Throwable t) { + LOG.error("Error while running ScmTableCountTask: {}", t); + if (t instanceof InterruptedException) { + Thread.currentThread().interrupt(); + } + } + } + + private void runTableCountProcess() { + try { + long startTime, endTime, duration, durationMilliseconds; + try { + int execute = dslContext.truncate(SCM_TABLE_COUNT_TABLE_NAME).execute(); + LOG.info("Deleted {} records from {}", execute, + SCM_TABLE_COUNT_TABLE_NAME); + } catch (Exception e) { + LOG.error("An error occurred while truncating the table {}: {}", + SCM_TABLE_COUNT_TABLE_NAME, e.getMessage(), e); + return; + } + startTime = System.nanoTime(); + processTableCount(); + endTime = System.nanoTime(); + duration = endTime - startTime; + durationMilliseconds = duration / NANOSECONDS_IN_MILLISECOND; + LOG.info( + "Elapsed Time in milliseconds for processTableCount() execution: {}", + durationMilliseconds); + } catch (Throwable t) { + LOG.error("Error while performing table count: {}", t); + } + } + + /** + * Processes the table count by iterating over SCM tables and retrieving the + * counts of objects in each table. The counts are then stored in the Recon + * database. + * + * @throws IOException if an I/O error occurs during table count processing. + */ + public void processTableCount() throws IOException { + // Acquire write lock + lock.writeLock().lock(); + try { + // Initialize the object count map + Map<String, Long> objectCountMap = initializeCountMap(); + + // Iterate over SCM tables + for (String tableName : getTaskTables()) { + Table table = scmDBStore.getTable(tableName); + + try (TableIterator keyIter = table.iterator()) { + // Retrieve the count of objects in the table + long count = Iterators.size(keyIter); + objectCountMap.put(getRowKeyFromTable(tableName), count); + } catch (IOException ioEx) { + LOG.error("Unable to populate SCM Table Count in Recon DB.", ioEx); + } + } + + // Write the counts to the Recon db if the object count map is not empty + if (!objectCountMap.isEmpty()) { + writeCountsToDB(objectCountMap); + } + + objectCountMap.clear(); + LOG.info("Completed writing SCM table counts to DB."); + } finally { + // Release write lock + lock.writeLock().unlock(); + } + } + + + /** + * Writes the object counts from the object count map to the Recon database. + * + * @param objectCountMap a map containing table names as keys and their object + * counts as values. + */ + private void writeCountsToDB(Map<String, Long> objectCountMap) { + List<ScmTableCount> insertToDb = new ArrayList<>(); + + // Iterate over the object count map + for (Map.Entry<String, Long> entry : objectCountMap.entrySet()) { + // Create a new ScmTableCount object + ScmTableCount scmTableCountRecord = new ScmTableCount(); + scmTableCountRecord.setTableName(entry.getKey()); + scmTableCountRecord.setCount(entry.getValue()); + + // Add the ScmTableCount object to the list + insertToDb.add(scmTableCountRecord); + } + // Insert the list of ScmTableCount objects into the Recon database + scmTableCountDao.insert(insertToDb); + } + + private Map<String, Long> initializeCountMap() throws IOException { + Collection<String> tables = getTaskTables(); Review Comment: Done! -- This is an automated message from the Apache Git Service. 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