LoaderUtilsTest.java example

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/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * Licensed 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 com.linkedin.pinot.core.segment.index.loader;

import com.linkedin.pinot.common.utils.CommonConstants;
import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import org.testng.Assert;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;


public class LoaderUtilsTest {
  private static final File TEST_DIR = new File("tmp", LoaderUtils.class.getName());

  @BeforeClass
  public void setUp()
      throws IOException {
    FileUtils.deleteDirectory(TEST_DIR);
    Assert.assertTrue(TEST_DIR.mkdirs());
  }

  @Test
  public void testReloadFailureRecovery()
      throws IOException {
    String segmentName = "dummySegment";
    String indexFileName = "dummyIndex";
    File indexDir = new File(TEST_DIR, segmentName);
    File segmentBackupDir = new File(TEST_DIR, segmentName + CommonConstants.Segment.SEGMENT_BACKUP_DIR_SUFFIX);
    File segmentTempDir = new File(TEST_DIR, segmentName + CommonConstants.Segment.SEGMENT_TEMP_DIR_SUFFIX);

    // Only index directory exists (normal case, or failed before the first renaming)
    Assert.assertTrue(indexDir.mkdir());
    FileUtils.touch(new File(indexDir, indexFileName));
    LoaderUtils.reloadFailureRecovery(indexDir);
    Assert.assertTrue(indexDir.exists());
    Assert.assertTrue(new File(indexDir, indexFileName).exists());
    Assert.assertFalse(segmentBackupDir.exists());
    Assert.assertFalse(segmentTempDir.exists());
    FileUtils.deleteDirectory(indexDir);

    // Only segment backup directory exists (failed after the first renaming but before copying happened)
    Assert.assertTrue(segmentBackupDir.mkdir());
    FileUtils.touch(new File(segmentBackupDir, indexFileName));
    LoaderUtils.reloadFailureRecovery(indexDir);
    Assert.assertTrue(indexDir.exists());
    Assert.assertTrue(new File(indexDir, indexFileName).exists());
    Assert.assertFalse(segmentBackupDir.exists());
    Assert.assertFalse(segmentTempDir.exists());
    FileUtils.deleteDirectory(indexDir);

    // Index directory and segment backup directory exist (failed before second renaming)
    Assert.assertTrue(indexDir.mkdir());
    Assert.assertTrue(segmentBackupDir.mkdir());
    FileUtils.touch(new File(segmentBackupDir, indexFileName));
    LoaderUtils.reloadFailureRecovery(indexDir);
    Assert.assertTrue(indexDir.exists());
    Assert.assertTrue(new File(indexDir, indexFileName).exists());
    Assert.assertFalse(segmentBackupDir.exists());
    Assert.assertFalse(segmentTempDir.exists());
    FileUtils.deleteDirectory(indexDir);

    // Index directory and segment temporary directory exist (failed after second renaming)
    Assert.assertTrue(indexDir.mkdir());
    FileUtils.touch(new File(indexDir, indexFileName));
    Assert.assertTrue(segmentTempDir.mkdir());
    LoaderUtils.reloadFailureRecovery(indexDir);
    Assert.assertTrue(indexDir.exists());
    Assert.assertTrue(new File(indexDir, indexFileName).exists());
    Assert.assertFalse(segmentBackupDir.exists());
    Assert.assertFalse(segmentTempDir.exists());
    FileUtils.deleteDirectory(indexDir);
  }

  @AfterClass
  public void tearDown()
      throws IOException {
    FileUtils.deleteDirectory(TEST_DIR);
  }
}