src/main/java/org/apache/accumulo/testing/randomwalk/image/ScanMeta.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.
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package org.apache.accumulo.testing.randomwalk.image;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Random;
import java.util.UUID;

import org.apache.accumulo.core.client.AccumuloClient;
import org.apache.accumulo.core.client.BatchScanner;
import org.apache.accumulo.core.client.Scanner;
import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Range;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.security.Authorizations;
import org.apache.accumulo.testing.randomwalk.RandWalkEnv;
import org.apache.accumulo.testing.randomwalk.State;
import org.apache.accumulo.testing.randomwalk.Test;
import org.apache.hadoop.io.Text;

public class ScanMeta extends Test {

  @Override
  public void visit(State state, RandWalkEnv env, Properties props) throws Exception {

    // scan just the metadata of the images table to find N hashes... use
    // the batch scanner to lookup those N hashes in the index table
    // this scan will test locality groups....

    String indexTableName = state.getString("indexTableName");
    String imageTableName = state.getString("imageTableName");

    String uuid = UUID.randomUUID().toString();

    AccumuloClient client = env.getAccumuloClient();

    Scanner imageScanner = client.createScanner(imageTableName, new Authorizations());

    imageScanner.setRange(new Range(new Text(uuid), null));
    imageScanner.fetchColumn(Write.META_COLUMN_FAMILY, Write.SHA1_COLUMN_QUALIFIER);

    int minScan = Integer.parseInt(props.getProperty("minScan"));
    int maxScan = Integer.parseInt(props.getProperty("maxScan"));

    Random rand = new Random();
    int numToScan = rand.nextInt(maxScan - minScan) + minScan;

    Map<Text,Text> hashes = new HashMap<>();

    Iterator<Entry<Key,Value>> iter = imageScanner.iterator();

    while (iter.hasNext() && numToScan > 0) {

      Entry<Key,Value> entry = iter.next();

      hashes.put(new Text(entry.getValue().get()), entry.getKey().getRow());

      numToScan--;
    }

    log.debug("Found " + hashes.size() + " hashes starting at " + uuid);

    if (hashes.isEmpty()) {
      return;
    }

    // use batch scanner to verify all of these exist in index
    BatchScanner indexScanner = client.createBatchScanner(indexTableName, Authorizations.EMPTY, 3);
    ArrayList<Range> ranges = new ArrayList<>();
    for (Text row : hashes.keySet()) {
      ranges.add(new Range(row));
    }

    indexScanner.setRanges(ranges);

    Map<Text,Text> hashes2 = new HashMap<>();

    for (Entry<Key,Value> entry : indexScanner)
      hashes2.put(entry.getKey().getRow(), new Text(entry.getValue().get()));

    log.debug("Looked up " + ranges.size() + " ranges, found " + hashes2.size());

    if (!hashes.equals(hashes2)) {
      log.error("uuids from doc table : " + hashes.values());
      log.error("uuids from index     : " + hashes2.values());
      throw new Exception(
          "Mismatch between document table and index " + indexTableName + " " + imageTableName);
    }

    indexScanner.close();

  }

}