Df.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.extraction.demux.processor.mapper;


import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecord;
import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecordKey;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reporter;
import org.apache.log4j.Logger;

public class Df extends AbstractProcessor {
  static Logger log = Logger.getLogger(Df.class);
  private static final String[] headerSplitCols = { "Filesystem", "1K-blocks",
      "Used", "Available", "Use%", "Mounted", "on" };
  private static final String[] headerCols = { "Filesystem", "1K-blocks",
      "Used", "Available", "Use%", "Mounted on" };
  private SimpleDateFormat sdf = null;

  public Df() {
    sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
  }

  @Override
  protected void parse(String recordEntry,
      OutputCollector<ChukwaRecordKey, ChukwaRecord> output, Reporter reporter)
      throws Throwable {

    try {
      String dStr = recordEntry.substring(0, 23);
      int start = 24;
      int idx = recordEntry.indexOf(' ', start);
      // String level = recordEntry.substring(start, idx);
      start = idx + 1;
      idx = recordEntry.indexOf(' ', start);
      // String className = recordEntry.substring(start, idx-1);
      String body = recordEntry.substring(idx + 1);

      Date d = sdf.parse(dStr);
      String[] lines = body.split("\n");

      String[] outputCols = lines[0].split("[\\s]++");

      if (outputCols.length != headerSplitCols.length
          || outputCols[0].intern() != headerSplitCols[0].intern()
          || outputCols[1].intern() != headerSplitCols[1].intern()
          || outputCols[2].intern() != headerSplitCols[2].intern()
          || outputCols[3].intern() != headerSplitCols[3].intern()
          || outputCols[4].intern() != headerSplitCols[4].intern()
          || outputCols[5].intern() != headerSplitCols[5].intern()
          || outputCols[6].intern() != headerSplitCols[6].intern()) {
        throw new DFInvalidRecord("Wrong output format (header) ["
            + recordEntry + "]");
      }

      String[] values = null;

      // Data
      ChukwaRecord record = null;

      for (int i = 1; i < lines.length; i++) {
        values = lines[i].split("[\\s]++");
        key = new ChukwaRecordKey();
        record = new ChukwaRecord();
        this.buildGenericRecord(record, null, d.getTime(), "Df");

        record.add(headerCols[0], values[0]);
        record.add(headerCols[1], values[1]);
        record.add(headerCols[2], values[2]);
        record.add(headerCols[3], values[3]);
        record.add(headerCols[4], values[4]
            .substring(0, values[4].length() - 1)); // Remove %
        record.add(headerCols[5], values[5]);

        output.collect(key, record);
      }

      // log.info("DFProcessor output 1 DF record");
    } catch (ParseException e) {
      e.printStackTrace();
      log.warn("Wrong format in DFProcessor [" + recordEntry + "]", e);
      throw e;
    } catch (IOException e) {
      e.printStackTrace();
      log.warn("Unable to collect output in DFProcessor [" + recordEntry + "]",
          e);
      throw e;
    } catch (DFInvalidRecord e) {
      e.printStackTrace();
      log.warn("Wrong format in DFProcessor [" + recordEntry + "]", e);
      throw e;
    }
  }
}