core/src/main/java/org/apache/hadoop/chukwa/datacollection/test/SinkFileValidator.java

/*
 * 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.hadoop.chukwa.datacollection.test;


import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.Charset;

import org.apache.hadoop.chukwa.ChukwaArchiveKey;
import org.apache.hadoop.chukwa.ChunkImpl;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Writable;

public class SinkFileValidator {

  public static void main(String[] args) {
    String fsURL = "hdfs://localhost:9000";
    String fname;
    if (args.length < 1) {
      System.out
          .println("usage:  SinkFileValidator <filename> [filesystem URI] ");
      return;
    }
    fname = args[0];
    if (args.length > 1)
      fsURL = args[1];

    Configuration conf = new Configuration();
    try {
      FileSystem fs;
      if (fsURL.equals("local"))
        fs = FileSystem.getLocal(conf);
      else
        fs = FileSystem.get(new URI(fsURL), conf);
      SequenceFile.Reader r = new SequenceFile.Reader(fs, new Path(fname), conf);
      System.out.println("key class name is " + r.getKeyClassName());
      System.out.println("value class name is " + r.getValueClassName());

      ChukwaArchiveKey key = new ChukwaArchiveKey();
      ChunkImpl evt = ChunkImpl.getBlankChunk();
      int events = 0;
      while (r.next(key, evt) && (events < 5)) {
        if (!Writable.class.isAssignableFrom(key.getClass()))
          System.out.println("warning: keys aren't writable");

        if (!Writable.class.isAssignableFrom(evt.getClass()))
          System.out.println("warning: values aren't writable");

        if (evt.getData().length > 1000) {
          System.out.println("got event; data: "
              + new String(evt.getData(), 0, 1000, Charset.forName("UTF-8")));
          System.out.println("....[truncating]");
        } else
          System.out.println("got event; data: " + new String(evt.getData(), Charset.forName("UTF-8")));
        events++;
      }
      System.out.println("file looks OK!");
    } catch (IOException e) {
      e.printStackTrace();
    } catch (URISyntaxException e) {
      e.printStackTrace();
    }

  }

}