src/main/java/org/apache/accumulo/testing/merkle/cli/ManualComparison.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.accumulo.testing.merkle.cli;

import java.util.Iterator;
import java.util.Map.Entry;

import org.apache.accumulo.core.client.AccumuloClient;
import org.apache.accumulo.core.client.Scanner;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.security.Authorizations;
import org.apache.accumulo.testing.cli.ClientOpts;

import com.beust.jcommander.Parameter;

/**
 * Accepts two table names and enumerates all key-values pairs in both checking for correctness. All
 * differences between the two tables will be printed to the console.
 */
public class ManualComparison {

  public static class ManualComparisonOpts extends ClientOpts {
    @Parameter(names = {"--table1"}, required = true, description = "First table")
    public String table1;

    @Parameter(names = {"--table2"}, required = true, description = "First table")
    public String table2;
  }

  public static void main(String[] args) throws Exception {
    ManualComparisonOpts opts = new ManualComparisonOpts();
    opts.parseArgs("ManualComparison", args);

    try (AccumuloClient client = opts.createClient();
        Scanner s1 = client.createScanner(opts.table1, Authorizations.EMPTY);
        Scanner s2 = client.createScanner(opts.table2, Authorizations.EMPTY)) {
      Iterator<Entry<Key,Value>> iter1 = s1.iterator(), iter2 = s2.iterator();
      boolean incrementFirst = true, incrementSecond = true;

      Entry<Key,Value> entry1 = iter1.next(), entry2 = iter2.next();
      while (iter1.hasNext() && iter2.hasNext()) {
        if (incrementFirst) {
          entry1 = iter1.next();
        }
        if (incrementSecond) {
          entry2 = iter2.next();
        }
        incrementFirst = false;
        incrementSecond = false;

        if (!entry1.equals(entry2)) {

          if (entry1.getKey().compareTo(entry2.getKey()) < 0) {
            System.out.println("Exist in original " + entry1);
            incrementFirst = true;
          } else if (entry2.getKey().compareTo(entry1.getKey()) < 0) {
            System.out.println("Exist in replica " + entry2);
            incrementSecond = true;
          } else {
            System.out.println("Differ... " + entry1 + " " + entry2);
            incrementFirst = true;
            incrementSecond = true;
          }
        } else {
          incrementFirst = true;
          incrementSecond = true;
        }
      }

      System.out.println("\nExtra entries from " + opts.table1);
      while (iter1.hasNext()) {
        System.out.println(iter1.next());
      }

      System.out.println("\nExtra entries from " + opts.table2);
      while (iter2.hasNext()) {
        System.out.println(iter2.next());
      }
    }
  }
}