package org.apache.helix.controller.stages;
/*
* 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
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*/
import java.util.Map;
import java.util.Set;
import org.apache.helix.HelixDataAccessor;
import org.apache.helix.HelixManager;
import org.apache.helix.api.Cluster;
import org.apache.helix.api.Participant;
import org.apache.helix.api.accessor.ClusterAccessor;
import org.apache.helix.api.id.ClusterId;
import org.apache.helix.api.id.ContextId;
import org.apache.helix.api.id.PartitionId;
import org.apache.helix.controller.context.ControllerContext;
import org.apache.helix.controller.context.ControllerContextProvider;
import org.apache.helix.controller.pipeline.AbstractBaseStage;
import org.apache.helix.controller.pipeline.StageException;
import org.apache.helix.model.ClusterConfiguration;
import org.apache.helix.monitoring.mbeans.ClusterStatusMonitor;
import org.apache.log4j.Logger;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
public class ReadClusterDataStage extends AbstractBaseStage {
private static final Logger LOG = Logger.getLogger(ReadClusterDataStage.class.getName());
private ClusterDataCache _cache = null;
@Override
public void process(ClusterEvent event) throws Exception {
long startTime = System.currentTimeMillis();
LOG.info("START ReadClusterDataStage.process()");
HelixManager manager = event.getAttribute("helixmanager");
if (manager == null) {
throw new StageException("HelixManager attribute value is null");
}
HelixDataAccessor accessor = manager.getHelixDataAccessor();
ClusterDataCache cache = event.getAttribute("ClusterDataCache");
if (cache == null && _cache == null) {
cache = new ClusterDataCache();
}
_cache = cache;
ClusterId clusterId = ClusterId.from(manager.getClusterName());
ClusterAccessor clusterAccessor = new ClusterAccessor(clusterId, accessor, _cache);
Cluster cluster = clusterAccessor.readCluster();
// Update the cluster status gauges
ClusterStatusMonitor clusterStatusMonitor =
(ClusterStatusMonitor) event.getAttribute("clusterStatusMonitor");
if (clusterStatusMonitor != null) {
Set<String> instanceSet = Sets.newHashSet();
Set<String> liveInstanceSet = Sets.newHashSet();
Set<String> disabledInstanceSet = Sets.newHashSet();
Map<String, Set<String>> disabledPartitions = Maps.newHashMap();
Map<String, Set<String>> tags = Maps.newHashMap();
for (Participant participant : cluster.getParticipantMap().values()) {
instanceSet.add(participant.getId().toString());
if (participant.isAlive()) {
liveInstanceSet.add(participant.getId().toString());
}
if (!participant.isEnabled()) {
disabledInstanceSet.add(participant.getId().toString());
}
Set<String> partitionNames = Sets.newHashSet();
for (PartitionId partitionId : participant.getDisabledPartitionIds()) {
partitionNames.add(partitionId.toString());
}
disabledPartitions.put(participant.getId().toString(), partitionNames);
tags.put(participant.getId().toString(), participant.getTags());
}
clusterStatusMonitor.setClusterInstanceStatus(liveInstanceSet, instanceSet,
disabledInstanceSet, disabledPartitions, tags);
}
event.addAttribute("Cluster", cluster);
event.addAttribute("ClusterDataCache", _cache);
// read contexts (if any)
Map<ContextId, ControllerContext> persistedContexts = null;
if (cluster != null) {
persistedContexts = cluster.getContextMap();
} else {
persistedContexts = Maps.newHashMap();
}
ControllerContextProvider contextProvider = new ControllerContextProvider(persistedContexts);
event.addAttribute(AttributeName.CONTEXT_PROVIDER.toString(), contextProvider);
// read ideal state rules (if any)
ClusterConfiguration clusterConfiguration =
accessor.getProperty(accessor.keyBuilder().clusterConfig());
if (clusterConfiguration == null) {
clusterConfiguration = new ClusterConfiguration(cluster.getId());
}
event.addAttribute(AttributeName.IDEAL_STATE_RULES.toString(),
clusterConfiguration.getIdealStateRules());
long endTime = System.currentTimeMillis();
LOG.info("END ReadClusterDataStage.process(). took: " + (endTime - startTime) + " ms");
}
}