Examples with VarByteChunkSingleValueWriter com.linkedin.pinot.core.io.writer.impl.v1.VarByteChunkSingleValueWriter used on opensource projects

Example 1 with VarByteChunkSingleValueWriter

use of com.linkedin.pinot.core.io.writer.impl.v1.VarByteChunkSingleValueWriter in project pinot by linkedin.

the class VarByteChunkSingleValueReaderWriteTest method test.

/**
   * This test writes {@link #NUM_STRINGS} using {@link VarByteChunkSingleValueWriter}. It then reads
   * the strings using {@link VarByteChunkSingleValueReader}, and asserts that what was written is the same as
   * what was read in.
   *
   * Number of docs and docs per chunk are chosen to generate complete as well partial chunks.
   *
   * @throws Exception
   */
@Test
public void test() throws Exception {
    String[] expected = new String[NUM_STRINGS];
    Random random = new Random();
    File outFile = new File(TEST_FILE);
    FileUtils.deleteQuietly(outFile);
    int maxStringLengthInBytes = 0;
    for (int i = 0; i < NUM_STRINGS; i++) {
        expected[i] = RandomStringUtils.random(random.nextInt(MAX_STRING_LENGTH));
        maxStringLengthInBytes = Math.max(maxStringLengthInBytes, expected[i].getBytes(UTF_8).length);
    }
    ChunkCompressor compressor = ChunkCompressorFactory.getCompressor("snappy");
    VarByteChunkSingleValueWriter writer = new VarByteChunkSingleValueWriter(outFile, compressor, NUM_STRINGS, NUM_DOCS_PER_CHUNK, maxStringLengthInBytes);
    for (int i = 0; i < NUM_STRINGS; i++) {
        writer.setString(i, expected[i]);
    }
    writer.close();
    PinotDataBuffer pinotDataBuffer = PinotDataBuffer.fromFile(outFile, ReadMode.mmap, FileChannel.MapMode.READ_ONLY, getClass().getName());
    ChunkDecompressor uncompressor = ChunkCompressorFactory.getDecompressor("snappy");
    VarByteChunkSingleValueReader reader = new VarByteChunkSingleValueReader(pinotDataBuffer, uncompressor);
    ChunkReaderContext context = reader.createContext();
    for (int i = 0; i < NUM_STRINGS; i++) {
        String actual = reader.getString(i, context);
        Assert.assertEquals(actual, expected[i]);
    }
    reader.close();
    FileUtils.deleteQuietly(outFile);
}