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Server functionality for HBase
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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.quotas;

import java.io.IOException;
import java.util.Optional;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.CoprocessorEnvironment;
import org.apache.hadoop.hbase.TableName;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.coprocessor.MasterCoprocessor;
import org.apache.hadoop.hbase.coprocessor.MasterCoprocessorEnvironment;
import org.apache.hadoop.hbase.coprocessor.MasterObserver;
import org.apache.hadoop.hbase.coprocessor.ObserverContext;
import org.apache.hadoop.hbase.shaded.protobuf.generated.QuotaProtos.Quotas;

/**
 * An observer to automatically delete space quotas when a table/namespace
 * are deleted.
 */
@InterfaceAudience.Private
public class MasterSpaceQuotaObserver implements MasterCoprocessor, MasterObserver {
  public static final String REMOVE_QUOTA_ON_TABLE_DELETE = "hbase.quota.remove.on.table.delete";
  public static final boolean REMOVE_QUOTA_ON_TABLE_DELETE_DEFAULT = true;

  private CoprocessorEnvironment cpEnv;
  private Configuration conf;
  private boolean quotasEnabled = false;

  @Override
  public Optional getMasterObserver() {
    return Optional.of(this);
  }

  @Override
  public void start(CoprocessorEnvironment ctx) throws IOException {
    this.cpEnv = ctx;
    this.conf = cpEnv.getConfiguration();
    this.quotasEnabled = QuotaUtil.isQuotaEnabled(conf);
  }

  @Override
  public void postDeleteTable(
      ObserverContext ctx, TableName tableName) throws IOException {
    // Do nothing if quotas aren't enabled
    if (!quotasEnabled) {
      return;
    }
    final Connection conn = ctx.getEnvironment().getConnection();
    Quotas quotas = QuotaUtil.getTableQuota(conn, tableName);
    if (quotas != null && quotas.hasSpace()) {
      QuotaSettings settings = QuotaSettingsFactory.removeTableSpaceLimit(tableName);
      try (Admin admin = conn.getAdmin()) {
        admin.setQuota(settings);
      }
    }
  }

  @Override
  public void postDeleteNamespace(
      ObserverContext ctx, String namespace) throws IOException {
    // Do nothing if quotas aren't enabled
    if (!quotasEnabled) {
      return;
    }
    final Connection conn = ctx.getEnvironment().getConnection();
    Quotas quotas = QuotaUtil.getNamespaceQuota(conn, namespace);
    if (quotas != null && quotas.hasSpace()) {
      QuotaSettings settings = QuotaSettingsFactory.removeNamespaceSpaceLimit(namespace);
      try (Admin admin = conn.getAdmin()) {
        admin.setQuota(settings);
      }
    }
  }
}