001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.master.balancer;
019
020import static org.apache.hadoop.hbase.master.balancer.CandidateGeneratorTestUtil.isTableIsolated;
021import static org.apache.hadoop.hbase.master.balancer.CandidateGeneratorTestUtil.runBalancerToExhaustion;
022
023import java.util.ArrayList;
024import java.util.HashMap;
025import java.util.List;
026import java.util.Map;
027import java.util.Set;
028import org.apache.hadoop.conf.Configuration;
029import org.apache.hadoop.hbase.ServerName;
030import org.apache.hadoop.hbase.TableName;
031import org.apache.hadoop.hbase.client.RegionInfo;
032import org.apache.hadoop.hbase.client.RegionInfoBuilder;
033import org.apache.hadoop.hbase.master.balancer.BalancerTestBase.MockMapping;
034import org.apache.hadoop.hbase.testclassification.MasterTests;
035import org.apache.hadoop.hbase.testclassification.MediumTests;
036import org.apache.hadoop.net.DNSToSwitchMapping;
037import org.junit.jupiter.api.BeforeAll;
038import org.junit.jupiter.api.Tag;
039import org.junit.jupiter.api.Test;
040import org.slf4j.Logger;
041import org.slf4j.LoggerFactory;
042
043@Tag(MediumTests.TAG)
044@Tag(MasterTests.TAG)
045public class TestLargeClusterBalancingSystemTableIsolation {
046
047  private static final Logger LOG =
048    LoggerFactory.getLogger(TestLargeClusterBalancingSystemTableIsolation.class);
049
050  private static final TableName SYSTEM_TABLE_NAME = TableName.valueOf("hbase:system");
051  private static final TableName NON_SYSTEM_TABLE_NAME = TableName.valueOf("userTable");
052
053  private static final int NUM_SERVERS = 1000;
054  private static final int NUM_REGIONS = 20_000;
055
056  private static final ServerName[] servers = new ServerName[NUM_SERVERS];
057  private static final Map<ServerName, List<RegionInfo>> serverToRegions = new HashMap<>();
058
059  @BeforeAll
060  public static void setup() {
061    // Initialize servers
062    for (int i = 0; i < NUM_SERVERS; i++) {
063      servers[i] = ServerName.valueOf("server" + i, i, System.currentTimeMillis());
064    }
065
066    // Create regions
067    List<RegionInfo> allRegions = new ArrayList<>();
068    for (int i = 0; i < NUM_REGIONS; i++) {
069      TableName tableName = i < 3 ? SYSTEM_TABLE_NAME : NON_SYSTEM_TABLE_NAME;
070      byte[] startKey = new byte[1];
071      startKey[0] = (byte) i;
072      byte[] endKey = new byte[1];
073      endKey[0] = (byte) (i + 1);
074
075      RegionInfo regionInfo =
076        RegionInfoBuilder.newBuilder(tableName).setStartKey(startKey).setEndKey(endKey).build();
077      allRegions.add(regionInfo);
078    }
079
080    // Assign all regions to the first server
081    serverToRegions.put(servers[0], new ArrayList<>(allRegions));
082    for (int i = 1; i < NUM_SERVERS; i++) {
083      serverToRegions.put(servers[i], new ArrayList<>());
084    }
085  }
086
087  @Test
088  public void testSystemTableIsolation() {
089    Configuration conf = new Configuration(false);
090    conf.setClass("hbase.util.ip.to.rack.determiner", MockMapping.class, DNSToSwitchMapping.class);
091    conf.setBoolean(BalancerConditionals.ISOLATE_SYSTEM_TABLES_KEY, true);
092    runBalancerToExhaustion(conf, serverToRegions, Set.of(this::isSystemTableIsolated), 10.0f);
093    LOG.info("Meta table regions are successfully isolated.");
094  }
095
096  private boolean isSystemTableIsolated(BalancerClusterState cluster) {
097    return isTableIsolated(cluster, SYSTEM_TABLE_NAME, "System");
098  }
099}