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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.hadoop.hbase.mob;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.ScheduledChore;
import org.apache.hadoop.hbase.TableDescriptors;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
import org.apache.hadoop.hbase.client.TableDescriptor;
import org.apache.hadoop.hbase.master.HMaster;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The class MobFileCleanerChore for running cleaner regularly to remove the expired and obsolete
 * (files which have no active references to) mob files.
 */
@InterfaceAudience.Private
public class MobFileCleanerChore extends ScheduledChore {

  private static final Logger LOG = LoggerFactory.getLogger(MobFileCleanerChore.class);
  private final HMaster master;
  private ExpiredMobFileCleaner cleaner;

  static {
    Configuration.addDeprecation(MobConstants.DEPRECATED_MOB_CLEANER_PERIOD,
      MobConstants.MOB_CLEANER_PERIOD);
  }

  public MobFileCleanerChore(HMaster master) {
    super(master.getServerName() + "-MobFileCleanerChore", master,
      master.getConfiguration().getInt(MobConstants.MOB_CLEANER_PERIOD,
        MobConstants.DEFAULT_MOB_CLEANER_PERIOD),
      master.getConfiguration().getInt(MobConstants.MOB_CLEANER_PERIOD,
        MobConstants.DEFAULT_MOB_CLEANER_PERIOD),
      TimeUnit.SECONDS);
    this.master = master;
    cleaner = new ExpiredMobFileCleaner();
    cleaner.setConf(master.getConfiguration());
    checkObsoleteConfigurations();
  }

  private void checkObsoleteConfigurations() {
    Configuration conf = master.getConfiguration();

    if (conf.get("hbase.mob.compaction.mergeable.threshold") != null) {
      LOG.warn("'hbase.mob.compaction.mergeable.threshold' is obsolete and not used anymore.");
    }
    if (conf.get("hbase.mob.delfile.max.count") != null) {
      LOG.warn("'hbase.mob.delfile.max.count' is obsolete and not used anymore.");
    }
    if (conf.get("hbase.mob.compaction.threads.max") != null) {
      LOG.warn("'hbase.mob.compaction.threads.max' is obsolete and not used anymore.");
    }
    if (conf.get("hbase.mob.compaction.batch.size") != null) {
      LOG.warn("'hbase.mob.compaction.batch.size' is obsolete and not used anymore.");
    }
  }

  @Override
  protected void chore() {
    TableDescriptors htds = master.getTableDescriptors();

    Map map = null;
    try {
      map = htds.getAll();
    } catch (IOException e) {
      LOG.error("MobFileCleanerChore failed", e);
      return;
    }
    for (TableDescriptor htd : map.values()) {
      for (ColumnFamilyDescriptor hcd : htd.getColumnFamilies()) {
        if (hcd.isMobEnabled() && hcd.getMinVersions() == 0) {
          try {
            cleaner.cleanExpiredMobFiles(htd.getTableName().getNameAsString(), hcd);
          } catch (IOException e) {
            LOG.error("Failed to clean the expired mob files table={} family={}",
              htd.getTableName().getNameAsString(), hcd.getNameAsString(), e);
          }
        }
      }
      try {
        // Now clean obsolete files for a table
        LOG.info("Cleaning obsolete MOB files from table={}", htd.getTableName());
        try (final Admin admin = master.getConnection().getAdmin()) {
          MobFileCleanupUtil.cleanupObsoleteMobFiles(master.getConfiguration(), htd.getTableName(),
            admin);
        }
        LOG.info("Cleaning obsolete MOB files finished for table={}", htd.getTableName());
      } catch (IOException e) {
        LOG.error("Failed to clean the obsolete mob files for table={}", htd.getTableName(), e);
      }
    }
  }

}