DataExpiration.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.database;


import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.chukwa.util.DatabaseWriter;

public class DataExpiration {
  private static DatabaseConfig dbc = null;
  private static Log log = LogFactory.getLog(DataExpiration.class);

  public DataExpiration() {
    if (dbc == null) {
      dbc = new DatabaseConfig();
    }
  }

  public void dropTables(long start, long end) {
    String cluster = System.getProperty("CLUSTER");
    if (cluster == null) {
      cluster = "unknown";
    }
    DatabaseWriter dbw = new DatabaseWriter(cluster);
    try {
      HashMap<String, String> dbNames = dbc.startWith("report.db.name.");
      Iterator<String> ki = dbNames.keySet().iterator();
      while (ki.hasNext()) {
        String name = ki.next();
        String tableName = dbNames.get(name);
        String[] tableList = dbc.findTableName(tableName, start, end);
        for (String tl : tableList) {
          log.debug("table name: " + tableList[0]);
          try {
            String[] parts = tl.split("_");
            int partition = Integer.parseInt(parts[parts.length - 2]);
            String table = "";
            for (int i = 0; i < parts.length - 2; i++) {
              if (i != 0) {
                table = table + "_";
              }
              table = table + parts[i];
            }
            partition = partition - 3;
            String dropPartition = "drop table if exists " + table + "_"
                + partition + "_" + parts[parts.length - 1];
            dbw.execute(dropPartition);
            partition--;
            if(partition>=0) {
              dropPartition = "drop table if exists " + table + "_" + partition
                  + "_" + parts[parts.length - 1];
              dbw.execute(dropPartition);
            }
          } catch (NumberFormatException e) {
            log
                .error("Error in parsing table partition number, skipping table:"
                    + tableList[0]);
          } catch (ArrayIndexOutOfBoundsException e) {
            log.debug("Skipping table:" + tableList[0]
                + ", because it has no partition configuration.");
          }
        }
      }
      dbw.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public static void usage() {
    System.out.println("DataExpiration usage:");
    System.out
        .println("java -jar chukwa-core.jar org.apache.hadoop.chukwa.DataExpiration <date> <time window size>");
    System.out.println("     date format: YYYY-MM-DD");
    System.out.println("     time window size: 7, 30, 91, 365");
  }

  public static void main(String[] args) {
    DataExpiration de = new DataExpiration();
    long now = (new Date()).getTime();
    long start = now;
    long end = now;
    if (args.length == 2) {
      SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
      try {
        long dataExpStart = Calendar.getInstance().getTimeInMillis();
        start = sdf.parse(args[0]).getTime();
        end = start + (Long.parseLong(args[1]) * 1440 * 60 * 1000L);
        de.dropTables(start, end);
        long dataExpEnd = Calendar.getInstance().getTimeInMillis();
        log.info("DataExpiration for: "+args[0]+" "+args[1]+" finished: ("+(double) (dataExpEnd-dataExpStart)/1000+" seconds)");
      } catch (Exception e) {
        usage();
      }
    } else {
      usage();
    }
  }
}