alluxio.cli.job.command.LeaderCommand.java Source code

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Here is the source code for alluxio.cli.job.command.LeaderCommand.java

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.cli.job.command;

import alluxio.cli.CommandUtils;
import alluxio.cli.fs.command.AbstractFileSystemCommand;
import alluxio.client.file.FileSystem;
import alluxio.client.job.JobContext;
import alluxio.exception.status.InvalidArgumentException;

import org.apache.commons.cli.CommandLine;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.InetSocketAddress;

import javax.annotation.concurrent.ThreadSafe;

/**
 * Prints the current leader master host name.
 */
@ThreadSafe
public final class LeaderCommand extends AbstractFileSystemCommand {
    private static final Logger LOG = LoggerFactory.getLogger(LeaderCommand.class);

    /**
     * creates the job leader command.
     *
     * @param fs the Alluxio filesystem client
     */
    public LeaderCommand(FileSystem fs) {
        super(fs);
    }

    @Override
    public String getCommandName() {
        return "leader";
    }

    @Override
    public void validateArgs(CommandLine cl) throws InvalidArgumentException {
        CommandUtils.checkNumOfArgsEquals(this, cl, 0);
    }

    @Override
    public int run(CommandLine cl) {
        try {
            InetSocketAddress address = JobContext.INSTANCE.getJobMasterAddress();
            System.out.println(address.getHostName());
        } catch (Exception e) {
            LOG.error("Failed to get the primary job master", e);
            System.out.println("Failed to get the primary job master.");
            return -1;
        }
        return 0;
    }

    @Override
    public String getUsage() {
        return "leader";
    }

    @Override
    public String getDescription() {
        return "Prints the hostname of the job master service leader.";
    }
}