hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataDirs.java

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 * 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
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 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.hadoop.hdfs.server.datanode;

import java.io.*;
import java.net.URI;
import java.util.*;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.DF;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.util.Shell;
import org.junit.AssumptionViolatedException;
import org.junit.Test;

import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_DATA_DIR_KEY;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.*;

public class TestDataDirs {

  @Test(timeout = 30000)
  public void testDataDirParsing() throws Throwable {
    Configuration conf = new Configuration();
    List<StorageLocation> locations;
    File dir0 = new File("/dir0");
    File dir1 = new File("/dir1");
    File dir2 = new File("/dir2");
    File dir3 = new File("/dir3");
    File dir4 = new File("/dir4");

    File dir5 = new File("/dir5");
    File dir6 = new File("/dir6");
    File dir7 = new File("/dir7");
    // Verify that a valid string is correctly parsed, and that storage
    // type is not case-sensitive and we are able to handle white-space between
    // storage type and URI.
    String locations1 = "[disk]/dir0,[DISK]/dir1,[sSd]/dir2,[disK]/dir3," +
            "[ram_disk]/dir4,[disk]/dir5, [disk] /dir6, [disk] , [nvdimm]/dir7";
    conf.set(DFS_DATANODE_DATA_DIR_KEY, locations1);
    locations = DataNode.getStorageLocations(conf);
    assertThat(locations.size(), is(9));
    assertThat(locations.get(0).getStorageType(), is(StorageType.DISK));
    assertThat(locations.get(0).getUri(), is(dir0.toURI()));
    assertThat(locations.get(1).getStorageType(), is(StorageType.DISK));
    assertThat(locations.get(1).getUri(), is(dir1.toURI()));
    assertThat(locations.get(2).getStorageType(), is(StorageType.SSD));
    assertThat(locations.get(2).getUri(), is(dir2.toURI()));
    assertThat(locations.get(3).getStorageType(), is(StorageType.DISK));
    assertThat(locations.get(3).getUri(), is(dir3.toURI()));
    assertThat(locations.get(4).getStorageType(), is(StorageType.RAM_DISK));
    assertThat(locations.get(4).getUri(), is(dir4.toURI()));
    assertThat(locations.get(5).getStorageType(), is(StorageType.DISK));
    assertThat(locations.get(5).getUri(), is(dir5.toURI()));
    assertThat(locations.get(6).getStorageType(), is(StorageType.DISK));
    assertThat(locations.get(6).getUri(), is(dir6.toURI()));

    // not asserting the 8th URI since it is incomplete and it in the
    // test set to make sure that we don't fail if we get URIs like that.
    assertThat(locations.get(7).getStorageType(), is(StorageType.DISK));

    assertThat(locations.get(8).getStorageType(), is(StorageType.NVDIMM));
    assertThat(locations.get(8).getUri(), is(dir7.toURI()));

    // Verify that an unrecognized storage type result in an exception.
    String locations2 = "[BadMediaType]/dir0,[ssd]/dir1,[disk]/dir2";
    conf.set(DFS_DATANODE_DATA_DIR_KEY, locations2);
    try {
      locations = DataNode.getStorageLocations(conf);
      fail();
    } catch (IllegalArgumentException iae) {
      DataNode.LOG.info("The exception is expected.", iae);
    }

    // Assert that a string with no storage type specified is
    // correctly parsed and the default storage type is picked up.
    String locations3 = "/dir0,/dir1";
    conf.set(DFS_DATANODE_DATA_DIR_KEY, locations3);
    locations = DataNode.getStorageLocations(conf);
    assertThat(locations.size(), is(2));
    assertThat(locations.get(0).getStorageType(), is(StorageType.DISK));
    assertThat(locations.get(0).getUri(), is(dir0.toURI()));
    assertThat(locations.get(1).getStorageType(), is(StorageType.DISK));
    assertThat(locations.get(1).getUri(), is(dir1.toURI()));
  }

  @Test
  public void testDataDirFileSystem() throws Exception {
    if (Shell.MAC) {
      throw new AssumptionViolatedException("Not supported on MAC OS");
    }
    Configuration conf = new Configuration();
    String archiveDir = "/home";
    String location = "[DISK]/dir1,[ARCHIVE]" + archiveDir;
    conf.set(DFS_DATANODE_DATA_DIR_KEY, location);

    // NO any filesystem is set, should do as before
    List<StorageLocation> locations = DataNode.getStorageLocations(conf);
    assertEquals(2, locations.size());

    // Set the filesystem of archive as NOT existing filesystem
    // the archive directory should not be added.
    conf.set("dfs.datanode.storagetype.ARCHIVE.filesystem",
        "nothis_filesystem");
    locations = DataNode.getStorageLocations(conf);
    assertEquals(1, locations.size());

    // Set the filesystem of archive as right filesystem
    // the archive directory should be added.
    DF df = new DF(new File(archiveDir), conf);
    String fsInfo = df.getFilesystem();
    conf.set("dfs.datanode.storagetype.ARCHIVE.filesystem", fsInfo);
    locations = DataNode.getStorageLocations(conf);
    assertEquals(2, locations.size());
  }

  @Test
  public void testCapacityRatioForDataDir() {
    // Good case
    String config = "[0.9 ]/disk /2, [0.1]/disk2/1";
    Map<URI, Double> map = StorageLocation.parseCapacityRatio(config);
    assertEquals(0.9,
        map.get(new Path("/disk/2").toUri()), 0);
    assertEquals(0.1,
        map.get(new Path("/disk2/1").toUri()), 0);

    // config without capacity ratio
    config = "[0.9 ]/disk /2, /disk2/1";
    try {
      StorageLocation.parseCapacityRatio(config);
      fail("Should fail parsing");
    } catch (IllegalArgumentException e) {
      assertTrue(e.getMessage().contains(
          "Capacity ratio config is not with correct form"));
    }

    // config with bad capacity ratio
    config = "[11.1]/disk /2";
    try {
      StorageLocation.parseCapacityRatio(config);
      fail("Should fail parsing");
    } catch (IllegalArgumentException e) {
      assertTrue(e.getMessage().contains("is not between 0 to 1"));
    }

  }
}