hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestClientSideRegionScanner.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
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package org.apache.hadoop.hbase.client;

import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.HBaseTestingUtil;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.io.hfile.BlockCache;
import org.apache.hadoop.hbase.io.hfile.IndexOnlyLruBlockCache;
import org.apache.hadoop.hbase.testclassification.ClientTests;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category({ SmallTests.class, ClientTests.class })
public class TestClientSideRegionScanner {
  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
    HBaseClassTestRule.forClass(TestClientSideRegionScanner.class);

  private final static HBaseTestingUtil TEST_UTIL = new HBaseTestingUtil();

  private Configuration conf;
  private Path rootDir;
  private FileSystem fs;
  private TableDescriptor htd;
  private RegionInfo hri;
  private Scan scan;

  @BeforeClass
  public static void setUpBeforeClass() throws Exception {
    TEST_UTIL.startMiniCluster(1);
  }

  @AfterClass
  public static void tearDownAfterClass() throws Exception {
    TEST_UTIL.shutdownMiniCluster();
  }

  @Before
  public void setup() throws IOException {
    conf = TEST_UTIL.getConfiguration();
    rootDir = TEST_UTIL.getDefaultRootDirPath();
    fs = TEST_UTIL.getTestFileSystem();
    htd = TEST_UTIL.getAdmin().getDescriptor(TableName.META_TABLE_NAME);
    hri = TEST_UTIL.getAdmin().getRegions(TableName.META_TABLE_NAME).get(0);
    scan = new Scan();
  }

  @Test
  public void testDefaultBlockCache() throws IOException {
    Configuration copyConf = new Configuration(conf);
    ClientSideRegionScanner clientSideRegionScanner =
      new ClientSideRegionScanner(copyConf, fs, rootDir, htd, hri, scan, null);

    BlockCache blockCache = clientSideRegionScanner.getRegion().getBlockCache();
    assertNotNull(blockCache);
    assertTrue(blockCache instanceof IndexOnlyLruBlockCache);
    assertTrue(HConstants.HBASE_CLIENT_SCANNER_ONHEAP_BLOCK_CACHE_FIXED_SIZE_DEFAULT == blockCache
      .getMaxSize());
  }

  @Test
  public void testConfiguredBlockCache() throws IOException {
    Configuration copyConf = new Configuration(conf);
    // tiny 1MB fixed cache size
    long blockCacheFixedSize = 1024 * 1024L;
    copyConf.setLong(HConstants.HFILE_ONHEAP_BLOCK_CACHE_FIXED_SIZE_KEY, blockCacheFixedSize);
    ClientSideRegionScanner clientSideRegionScanner =
      new ClientSideRegionScanner(copyConf, fs, rootDir, htd, hri, scan, null);

    BlockCache blockCache = clientSideRegionScanner.getRegion().getBlockCache();
    assertNotNull(blockCache);
    assertTrue(blockCache instanceof IndexOnlyLruBlockCache);
    assertTrue(blockCacheFixedSize == blockCache.getMaxSize());
  }

  @Test
  public void testNoBlockCache() throws IOException {
    Configuration copyConf = new Configuration(conf);
    copyConf.setFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY, 0.0f);
    ClientSideRegionScanner clientSideRegionScanner =
      new ClientSideRegionScanner(copyConf, fs, rootDir, htd, hri, scan, null);

    BlockCache blockCache = clientSideRegionScanner.getRegion().getBlockCache();
    assertNull(blockCache);
  }
}