org.apache.ivory.latedata.LateDataHandler.java Source code

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Here is the source code for org.apache.ivory.latedata.LateDataHandler.java

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/*
 * 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 under the License.
 */

package org.apache.ivory.latedata;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.LinkedHashMap;
import java.util.Map;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.log4j.Logger;

public class LateDataHandler extends Configured implements Tool {

    private static Logger LOG = Logger.getLogger(LateDataHandler.class);

    static PrintStream stream = System.out;

    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        Path confPath = new Path("file:///" + System.getProperty("oozie.action.conf.xml"));

        LOG.info(confPath + " found ? " + confPath.getFileSystem(conf).exists(confPath));
        conf.addResource(confPath);
        ToolRunner.run(new Configuration(), new LateDataHandler(), args);
    }

    private static CommandLine getCommand(String[] args) throws ParseException {
        Options options = new Options();

        Option opt = new Option("out", true, "Out file name");
        opt.setRequired(true);
        options.addOption(opt);
        opt = new Option("paths", true, "Comma separated path list, further separated by #");
        opt.setRequired(true);
        options.addOption(opt);
        opt = new Option("ivoryInputFeeds", true, "Input feed names, further separated by #");
        opt.setRequired(true);
        options.addOption(opt);

        return new GnuParser().parse(options, args);
    }

    @Override
    public int run(String[] args) throws Exception {

        CommandLine command = getCommand(args);

        Path file = new Path(command.getOptionValue("out"));
        Map<String, Long> map = new LinkedHashMap<String, Long>();
        String pathStr = getOptionValue(command, "paths");
        if (pathStr == null)
            return 0;

        String[] pathGroups = pathStr.split("#");
        String[] inputFeeds = getOptionValue(command, "ivoryInputFeeds").split("#");
        for (int index = 0; index < pathGroups.length; index++) {
            long usage = 0;
            for (String pathElement : pathGroups[index].split(",")) {
                Path inPath = new Path(pathElement);
                usage += usage(inPath, getConf());
            }
            map.put(inputFeeds[index], usage);
        }
        LOG.info("MAP data: " + map);

        OutputStream out = file.getFileSystem(getConf()).create(file);
        for (Map.Entry<String, Long> entry : map.entrySet()) {
            out.write((entry.getKey() + "=" + entry.getValue() + "\n").getBytes());
        }
        out.close();
        return 0;
    }

    private String getOptionValue(CommandLine command, String option) {
        String value = command.getOptionValue(option);
        if (value.equals("null"))
            return null;
        return value;
    }

    public String detectChanges(Path file, Map<String, Long> map, Configuration conf) throws Exception {

        StringBuffer buffer = new StringBuffer();
        BufferedReader in = new BufferedReader(new InputStreamReader(file.getFileSystem(conf).open(file)));
        String line;
        try {
            Map<String, Long> recorded = new LinkedHashMap<String, Long>();
            while ((line = in.readLine()) != null) {
                if (line.isEmpty())
                    continue;
                int index = line.indexOf('=');
                String key = line.substring(0, index);
                long size = Long.parseLong(line.substring(index + 1));
                recorded.put(key, size);
            }

            for (Map.Entry<String, Long> entry : map.entrySet()) {
                if (recorded.get(entry.getKey()) == null) {
                    LOG.info("No matching key " + entry.getKey());
                    continue;
                }
                if (!recorded.get(entry.getKey()).equals(entry.getValue())) {
                    LOG.info("Recorded size:" + recorded.get(entry.getKey()) + "  is different from new size"
                            + entry.getValue());
                    buffer.append(entry.getKey()).append(',');
                }
            }
            if (buffer.length() == 0) {
                return "";
            } else {
                return buffer.substring(0, buffer.length() - 1);
            }

        } finally {
            in.close();
        }

    }

    public long usage(Path inPath, Configuration conf) throws IOException {
        FileSystem fs = inPath.getFileSystem(conf);
        FileStatus status[] = fs.globStatus(inPath);
        if (status == null || status.length == 0) {
            return 0;
        }
        long totalSize = 0;
        for (FileStatus statu : status) {
            totalSize += fs.getContentSummary(statu.getPath()).getLength();
        }
        return totalSize;
    }
}