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 */
018
019package org.apache.hadoop.hbase.chaos.actions;
020
021import java.io.IOException;
022import java.util.Collections;
023import java.util.HashSet;
024import java.util.Set;
025import java.util.stream.Collectors;
026import org.apache.hadoop.hbase.ClusterMetrics;
027import org.apache.hadoop.hbase.ServerName;
028import org.apache.hadoop.hbase.net.Address;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032/**
033 * Action to dump the cluster status.
034 */
035public class DumpClusterStatusAction extends Action {
036  private static final Logger LOG = LoggerFactory.getLogger(DumpClusterStatusAction.class);
037
038  private Set<Address> initialRegionServers;
039
040  @Override
041  protected Logger getLogger() {
042    return LOG;
043  }
044
045  @Override
046  public void init(ActionContext context) throws IOException {
047    super.init(context);
048    initialRegionServers = collectKnownRegionServers(initialStatus);
049  }
050
051  @Override
052  public void perform() throws Exception {
053    getLogger().debug("Performing action: Dump cluster status");
054    final ClusterMetrics currentMetrics = cluster.getClusterMetrics();
055    getLogger().info("Cluster status\n{}", currentMetrics);
056    reportMissingRegionServers(currentMetrics);
057    reportNewRegionServers(currentMetrics);
058  }
059
060  /**
061   * Build a set of all the host:port pairs of region servers known to this cluster.
062   */
063  private static Set<Address> collectKnownRegionServers(final ClusterMetrics clusterMetrics) {
064    final Set<Address> regionServers = clusterMetrics.getLiveServerMetrics()
065      .keySet()
066      .stream()
067      .map(ServerName::getAddress)
068      .collect(Collectors.toSet());
069    clusterMetrics.getDeadServerNames()
070      .stream()
071      .map(ServerName::getAddress)
072      .forEach(regionServers::add);
073    return Collections.unmodifiableSet(regionServers);
074  }
075
076  private void reportMissingRegionServers(final ClusterMetrics clusterMetrics) {
077    final Set<Address> regionServers = collectKnownRegionServers(clusterMetrics);
078    final Set<Address> missingRegionServers = new HashSet<>(initialRegionServers);
079    missingRegionServers.removeAll(regionServers);
080    if (!missingRegionServers.isEmpty()) {
081      final StringBuilder stringBuilder = new StringBuilder()
082        .append("region server(s) are missing from this cluster report");
083      missingRegionServers.stream()
084        .sorted()
085        .forEach(address -> stringBuilder.append("\n  ").append(address));
086      getLogger().warn(stringBuilder.toString());
087    }
088  }
089
090  private void reportNewRegionServers(final ClusterMetrics clusterMetrics) {
091    final Set<Address> regionServers = collectKnownRegionServers(clusterMetrics);
092    final Set<Address> newRegionServers = new HashSet<>(regionServers);
093    newRegionServers.removeAll(initialRegionServers);
094    if (!newRegionServers.isEmpty()) {
095      final StringBuilder stringBuilder = new StringBuilder()
096        .append("region server(s) are new for this cluster report");
097      newRegionServers.stream()
098        .sorted()
099        .forEach(address -> stringBuilder.append("\n  ").append(address));
100      getLogger().warn(stringBuilder.toString());
101    }
102  }
103}