Java Code Examples for org.apache.hadoop.io.SequenceFile.Reader#close()

The following examples show how to use org.apache.hadoop.io.SequenceFile.Reader#close() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: HiveToBaseCuboidMapperPerformanceTest.java    From kylin-on-parquet-v2 with Apache License 2.0 6 votes vote down vote up 
@Ignore("convenient trial tool for dev")
@Test
public void test() throws IOException, InterruptedException {
    Configuration hconf = HadoopUtil.getCurrentConfiguration();
    HiveToBaseCuboidMapper mapper = new HiveToBaseCuboidMapper();
    Context context = MockupMapContext.create(hconf, metadataUrl, cubeName, null);

    mapper.doSetup(context);

    Reader reader = new Reader(hconf, SequenceFile.Reader.file(srcPath));
    Writable key = (Writable) ReflectionUtils.newInstance(reader.getKeyClass(), hconf);
    Text value = new Text();

    while (reader.next(key, value)) {
        mapper.map(key, value, context);
    }

    reader.close();
}
Example 2
Source File: TestSequenceFileSerialization.java    From hadoop with Apache License 2.0 6 votes vote down vote up 
public void testJavaSerialization() throws Exception {
  Path file = new Path(System.getProperty("test.build.data",".") +
      "/testseqser.seq");
  
  fs.delete(file, true);
  Writer writer = SequenceFile.createWriter(fs, conf, file, Long.class,
      String.class);
  
  writer.append(1L, "one");
  writer.append(2L, "two");
  
  writer.close();
  
  Reader reader = new Reader(fs, file, conf);
  assertEquals(1L, reader.next((Object) null));
  assertEquals("one", reader.getCurrentValue((Object) null));
  assertEquals(2L, reader.next((Object) null));
  assertEquals("two", reader.getCurrentValue((Object) null));
  assertNull(reader.next((Object) null));
  reader.close();
  
}
Example 3
Source File: TestSequenceFileSerialization.java    From big-c with Apache License 2.0 6 votes vote down vote up 
public void testJavaSerialization() throws Exception {
  Path file = new Path(System.getProperty("test.build.data",".") +
      "/testseqser.seq");
  
  fs.delete(file, true);
  Writer writer = SequenceFile.createWriter(fs, conf, file, Long.class,
      String.class);
  
  writer.append(1L, "one");
  writer.append(2L, "two");
  
  writer.close();
  
  Reader reader = new Reader(fs, file, conf);
  assertEquals(1L, reader.next((Object) null));
  assertEquals("one", reader.getCurrentValue((Object) null));
  assertEquals(2L, reader.next((Object) null));
  assertEquals("two", reader.getCurrentValue((Object) null));
  assertNull(reader.next((Object) null));
  reader.close();
  
}
Example 4
Source File: HiveToBaseCuboidMapperPerformanceTest.java    From kylin with Apache License 2.0 6 votes vote down vote up 
@Ignore("convenient trial tool for dev")
@Test
public void test() throws IOException, InterruptedException {
    Configuration hconf = HadoopUtil.getCurrentConfiguration();
    HiveToBaseCuboidMapper mapper = new HiveToBaseCuboidMapper();
    Context context = MockupMapContext.create(hconf, metadataUrl, cubeName, null);

    mapper.doSetup(context);

    Reader reader = new Reader(hconf, SequenceFile.Reader.file(srcPath));
    Writable key = (Writable) ReflectionUtils.newInstance(reader.getKeyClass(), hconf);
    Text value = new Text();

    while (reader.next(key, value)) {
        mapper.map(key, value, context);
    }

    reader.close();
}
Example 5
Source File: BaseCuboidMapperPerformanceTest.java    From Kylin with Apache License 2.0 6 votes vote down vote up 
@Ignore("convenient trial tool for dev")
@Test
public void test() throws IOException, InterruptedException {
    Configuration hconf = new Configuration();
    BaseCuboidMapper mapper = new BaseCuboidMapper();
    Context context = MockupMapContext.create(hconf, metadataUrl, cubeName, null);

    mapper.setup(context);

    Reader reader = new Reader(hconf, SequenceFile.Reader.file(srcPath));
    Writable key = (Writable) ReflectionUtils.newInstance(reader.getKeyClass(), hconf);
    Text value = new Text();

    while (reader.next(key, value)) {
        mapper.map(key, value, context);
    }

    reader.close();
}
Example 6
Source File: SnapshotIndexDeletionPolicy.java    From incubator-retired-blur with Apache License 2.0 6 votes vote down vote up 
private void loadGenerations() throws IOException {
  FileSystem fileSystem = _path.getFileSystem(_configuration);
  FileStatus[] listStatus = fileSystem.listStatus(_path);
  SortedSet<FileStatus> existing = new TreeSet<FileStatus>(Arrays.asList(listStatus));
  if (existing.isEmpty()) {
    return;
  }
  FileStatus last = existing.last();
  Reader reader = new SequenceFile.Reader(fileSystem, last.getPath(), _configuration);
  Text key = new Text();
  LongWritable value = new LongWritable();
  while (reader.next(key, value)) {
    String name = key.toString();
    long gen = value.get();
    _namesToGenerations.put(name, gen);
    Set<String> names = _generationsToNames.get(gen);
    if (names == null) {
      names = Collections.newSetFromMap(new ConcurrentHashMap<String, Boolean>());
      _generationsToNames.put(gen, names);
    }
    names.add(name);
  }
  reader.close();
  existing.remove(last);
  cleanupOldFiles(fileSystem, existing);
}
Example 7
Source File: BlurInputFormatTest.java    From incubator-retired-blur with Apache License 2.0 6 votes vote down vote up 
private void walkOutput(Path output, Configuration conf, ResultReader resultReader) throws IOException {
  FileSystem fileSystem = output.getFileSystem(conf);
  FileStatus fileStatus = fileSystem.getFileStatus(output);
  if (fileStatus.isDir()) {
    FileStatus[] listStatus = fileSystem.listStatus(output, new PathFilter() {
      @Override
      public boolean accept(Path path) {
        return !path.getName().startsWith("_");
      }
    });
    for (FileStatus fs : listStatus) {
      walkOutput(fs.getPath(), conf, resultReader);
    }
  } else {
    Reader reader = new SequenceFile.Reader(fileSystem, output, conf);
    Text rowId = new Text();
    TableBlurRecord tableBlurRecord = new TableBlurRecord();
    while (reader.next(rowId, tableBlurRecord)) {
      resultReader.read(rowId, tableBlurRecord);
    }
    reader.close();
  }
}
Example 8
Source File: TestSequenceFileSerialization.java    From RDFS with Apache License 2.0 6 votes vote down vote up 
public void testJavaSerialization() throws Exception {
  Path file = new Path(System.getProperty("test.build.data",".") +
      "/test.seq");
  
  fs.delete(file, true);
  Writer writer = SequenceFile.createWriter(fs, conf, file, Long.class,
      String.class);
  
  writer.append(1L, "one");
  writer.append(2L, "two");
  
  writer.close();
  
  Reader reader = new Reader(fs, file, conf);
  assertEquals(1L, reader.next((Object) null));
  assertEquals("one", reader.getCurrentValue((Object) null));
  assertEquals(2L, reader.next((Object) null));
  assertEquals("two", reader.getCurrentValue((Object) null));
  assertNull(reader.next((Object) null));
  reader.close();
  
}
Example 9
Source File: TestSequenceFileSerialization.java    From hadoop-gpu with Apache License 2.0 6 votes vote down vote up 
public void testJavaSerialization() throws Exception {
  Path file = new Path(System.getProperty("test.build.data",".") +
      "/test.seq");
  
  fs.delete(file, true);
  Writer writer = SequenceFile.createWriter(fs, conf, file, Long.class,
      String.class);
  
  writer.append(1L, "one");
  writer.append(2L, "two");
  
  writer.close();
  
  Reader reader = new Reader(fs, file, conf);
  assertEquals(1L, reader.next((Object) null));
  assertEquals("one", reader.getCurrentValue((Object) null));
  assertEquals(2L, reader.next((Object) null));
  assertEquals("two", reader.getCurrentValue((Object) null));
  assertNull(reader.next((Object) null));
  reader.close();
  
}
Example 10
Source File: SeqFileReader.java    From aliyun-maxcompute-data-collectors with Apache License 2.0 5 votes vote down vote up 
public static Object getFirstValue(String filename) throws IOException {
  Reader r = null;
  try {
    // read from local filesystem
    Configuration conf = new Configuration();
    if (!BaseSqoopTestCase.isOnPhysicalCluster()) {
      conf.set(CommonArgs.FS_DEFAULT_NAME, CommonArgs.LOCAL_FS);
    }
    FileSystem fs = FileSystem.get(conf);
    r = new SequenceFile.Reader(fs, new Path(filename), conf);
    Object key = ReflectionUtils.newInstance(r.getKeyClass(), conf);
    Object val = ReflectionUtils.newInstance(r.getValueClass(), conf);
    LOG.info("Reading value of type " + r.getValueClassName()
        + " from SequenceFile " + filename);
    r.next(key);
    r.getCurrentValue(val);
    LOG.info("Value as string: " + val.toString());
    return val;
  } finally {
    if (null != r) {
      try {
        r.close();
      } catch (IOException ioe) {
        LOG.warn("IOException during close: " + ioe.toString());
      }
    }
  }
}
Example 11
Source File: CopySeq.java    From Kylin with Apache License 2.0 5 votes vote down vote up 
public static void copyTo64MB(String src, String dst) throws IOException {
    Configuration hconf = new Configuration();
    Path srcPath = new Path(src);
    Path dstPath = new Path(dst);

    FileSystem fs = FileSystem.get(hconf);
    long srcSize = fs.getFileStatus(srcPath).getLen();
    int copyTimes = (int) (67108864 / srcSize); // 64 MB
    System.out.println("Copy " + copyTimes + " times");

    Reader reader = new Reader(hconf, SequenceFile.Reader.file(srcPath));
    Writable key = (Writable) ReflectionUtils.newInstance(reader.getKeyClass(), hconf);
    Text value = new Text();

    Writer writer = SequenceFile.createWriter(hconf, Writer.file(dstPath), Writer.keyClass(key.getClass()), Writer.valueClass(Text.class), Writer.compression(CompressionType.BLOCK, getLZOCodec(hconf)));

    int count = 0;
    while (reader.next(key, value)) {
        for (int i = 0; i < copyTimes; i++) {
            writer.append(key, value);
            count++;
        }
    }

    System.out.println("Len: " + writer.getLength());
    System.out.println("Rows: " + count);

    reader.close();
    writer.close();
}