src/main/java/org/apache/hadoop/chukwa/database/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.sql.SQLException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map.Entry;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.chukwa.util.DatabaseWriter;
import org.apache.hadoop.chukwa.util.RegexUtil;

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

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

  @edu.umd.cs.findbugs.annotations.SuppressWarnings(value =
      "SQL_NONCONSTANT_STRING_PASSED_TO_EXECUTE", 
      justification = "Dynamic based upon tables in the database")
  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.");
      for(Entry<String, String> entry : dbNames.entrySet()) {
        String tableName = entry.getValue();
        if (!RegexUtil.isRegex(tableName)) {
          log.warn("Skipping tableName: '" + tableName
              + "' because there was an error parsing it as a regex: "
              + RegexUtil.regexError(tableName));
          return;
        }
        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]);
            StringBuilder table = new StringBuilder();
            for (int i = 0; i < parts.length - 2; i++) {
              if (i != 0) {
                table.append("_");
              }
              table.append(parts[i]);
            }
            partition = partition - 3;
            if(partition>=0) {
              StringBuilder dropPartition = new StringBuilder();
              dropPartition.append("drop table if exists ");
              dropPartition.append(table);
              dropPartition.append("_");
              dropPartition.append(partition);
              dropPartition.append("_");
              dropPartition.append(parts[parts.length - 1]);
              final String query = dropPartition.toString();
              dbw.execute(query);
            }
          } 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 (SQLException 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 (ParseException e) {
        usage();
      }
    } else {
      usage();
    }
  }
}