ivory.core.driver.BuildPositionalIndexIP.java Source code

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Here is the source code for ivory.core.driver.BuildPositionalIndexIP.java

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/*
 * Ivory: A Hadoop toolkit for web-scale information retrieval
 *
 * Licensed 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 ivory.core.driver;

import ivory.core.Constants;
import ivory.core.index.BuildIPInvertedIndexDocSorted;
import ivory.core.index.BuildIntPostingsForwardIndex;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
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 BuildPositionalIndexIP extends Configured implements Tool {
    private static final Logger LOG = Logger.getLogger(BuildPositionalIndexIP.class);

    private static int printUsage() {
        System.out.println("usage: [index-path] [num-of-reducers]");
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    /**
     * Runs this tool.
     */
    public int run(String[] args) throws Exception {
        if (args.length != 2) {
            printUsage();
            return -1;
        }

        Configuration conf = getConf();
        FileSystem fs = FileSystem.get(conf);

        String indexPath = args[0];

        Path p = new Path(indexPath);
        if (!fs.exists(p)) {
            LOG.warn("Index path doesn't exist...");
            return -1;
        }

        int numReducers = Integer.parseInt(args[1]);

        LOG.info("Tool name: " + BuildPositionalIndexIP.class.getCanonicalName());
        LOG.info(" - Index path: " + indexPath);

        conf.set(Constants.IndexPath, indexPath);
        conf.setInt(Constants.NumReduceTasks, numReducers);
        conf.set(Constants.PostingsListsType,
                ivory.core.data.index.PostingsListDocSortedPositional.class.getCanonicalName());

        new BuildIPInvertedIndexDocSorted(conf).run();
        new BuildIntPostingsForwardIndex(conf).run();

        return 0;
    }

    /**
     * Dispatches command-line arguments to the tool via the {@code ToolRunner}.
     */
    public static void main(String[] args) throws Exception {
        ToolRunner.run(new Configuration(), new BuildPositionalIndexIP(), args);
    }
}