com.cloudera.whirr.cm.handler.CmBalancerHandler.java Source code

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Here is the source code for com.cloudera.whirr.cm.handler.CmBalancerHandler.java

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/**
 * Licensed to Cloudera, Inc. under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  Cloudera, Inc. 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 com.cloudera.whirr.cm.handler;

import static org.apache.whirr.RolePredicates.role;
import static org.jclouds.scriptbuilder.domain.Statements.call;

import java.io.IOException;

import org.apache.whirr.Cluster;
import org.apache.whirr.RolePredicates;
import org.apache.whirr.service.ClusterActionEvent;
import org.apache.whirr.service.ClusterActionHandlerSupport;
import org.apache.whirr.service.FirewallManager.Rule;
import org.jclouds.scriptbuilder.domain.Statement;

import com.cloudera.whirr.cm.CmConstants;
import com.cloudera.whirr.cm.CmServerClusterInstance;
import com.cloudera.whirr.cm.handler.cdh.CmCdhImpalaDaemonHandler;
import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.collect.Lists;

public class CmBalancerHandler extends ClusterActionHandlerSupport implements CmConstants {

    public static final String ROLE = "cm-balancer";

    @Override
    public String getRole() {
        return ROLE;
    }

    @Override
    protected void beforeStart(ClusterActionEvent event) throws IOException, InterruptedException {
        super.beforeStart(event);
        final String portBalancerImpala = CmServerClusterInstance.getConfiguration(event.getClusterSpec())
                .getString(CmConstants.CONFIG_WHIRR_INTERNAL_PORT_BALANCER_IMPALA);
        addStatement(event, call("retry_helpers"));
        addStatement(event, call("configure_cm_balancer", "-b", portBalancerImpala, "-h",
                Joiner.on(',')
                        .join(Lists.transform(
                                Lists.newArrayList(event.getCluster()
                                        .getInstancesMatching(RolePredicates.role(CmCdhImpalaDaemonHandler.ROLE))),
                                new Function<Cluster.Instance, String>() {
                                    @Override
                                    public String apply(Cluster.Instance input) {
                                        return input.getPrivateIp() + ":" + portBalancerImpala;
                                    }
                                }))));
        if (CmServerClusterInstance.getConfiguration(event.getClusterSpec())
                .getBoolean(CONFIG_WHIRR_FIREWALL_ENABLE, true)) {
            event.getFirewallManager().addRules(
                    Rule.create().destination(role(getRole())).ports(Integer.parseInt(portBalancerImpala)));
            for (Statement portIngressStatement : event.getFirewallManager().getRulesAsStatements()) {
                addStatement(event, portIngressStatement);
            }
        }
    }

}