package org.apache.helix.taskexecution;
/*
* 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 org.apache.helix.ConfigAccessor;
import org.apache.helix.model.ConfigScope;
import org.apache.helix.model.builder.ConfigScopeBuilder;
import org.apache.helix.manager.zk.ZKHelixAdmin;
import org.apache.helix.manager.zk.ZNRecordSerializer;
import org.apache.helix.manager.zk.ZkClient;
import org.apache.helix.model.HelixConfigScope;
import org.apache.helix.model.StateModelDefinition;
import org.apache.helix.model.HelixConfigScope.ConfigScopeProperty;
import org.apache.helix.model.IdealState.IdealStateModeProperty;
import org.apache.helix.model.builder.HelixConfigScopeBuilder;
import org.apache.helix.tools.StateModelConfigGenerator;
public class TaskCluster {
public static final String DEFAULT_CLUSTER_NAME = "task-cluster";
static final String DEFAULT_STATE_MODEL = "OnlineOffline";
ZkClient _zkclient = null;
ZKHelixAdmin _admin = null;
private final String _clusterName;
public TaskCluster(String zkAddr, String clusterName) throws Exception {
_clusterName = clusterName;
_zkclient = new ZkClient(zkAddr, ZkClient.DEFAULT_SESSION_TIMEOUT,
ZkClient.DEFAULT_CONNECTION_TIMEOUT, new ZNRecordSerializer());
_admin = new ZKHelixAdmin(_zkclient);
}
public void setup() throws Exception {
// add cluster
_admin.addCluster(_clusterName, true);
// add state model definition
// StateModelConfigGenerator generator = new StateModelConfigGenerator();
_admin.addStateModelDef(
_clusterName,
DEFAULT_STATE_MODEL,
new StateModelDefinition(StateModelConfigGenerator
.generateConfigForOnlineOffline()));
}
public void disconnect() throws Exception {
_zkclient.close();
}
public void submitDag(String dagJson) throws Exception {
Dag dag = Dag.fromJson(dagJson);
submitDag(dag);
}
public void submitDag(Dag dag) throws Exception {
ConfigAccessor clusterConfig = new ConfigAccessor(_zkclient);
HelixConfigScope clusterScope = new HelixConfigScopeBuilder(ConfigScopeProperty.CLUSTER)
.forCluster(_clusterName)
.build();
for (String id : dag.getNodeIds()) {
Dag.Node node = dag.getNode(id);
clusterConfig.set(clusterScope, node.getId(), node.toJson());
_admin.addResource(_clusterName, node.getId(),
node.getNumPartitions(), DEFAULT_STATE_MODEL,
IdealStateModeProperty.AUTO_REBALANCE.toString());
}
for (String id : dag.getNodeIds()) {
_admin.rebalance(_clusterName, id, 1);
}
}
}