Examples with Scheme cascading.scheme.Scheme used on opensource projects

Example 6 with Scheme

use of cascading.scheme.Scheme in project parquet-mr by apache.

the class TestParquetTupleScheme method testFieldProjection.

@Test
public void testFieldProjection() throws Exception {
    createFileForRead();
    Path path = new Path(txtOutputPath);
    final FileSystem fs = path.getFileSystem(new Configuration());
    if (fs.exists(path))
        fs.delete(path, true);
    Scheme sourceScheme = new ParquetTupleScheme(new Fields("last_name"));
    Tap source = new Hfs(sourceScheme, parquetInputPath);
    Scheme sinkScheme = new TextLine(new Fields("last_name"));
    Tap sink = new Hfs(sinkScheme, txtOutputPath);
    Pipe assembly = new Pipe("namecp");
    assembly = new Each(assembly, new ProjectedTupleFunction());
    Flow flow = new HadoopFlowConnector().connect("namecp", source, sink, assembly);
    flow.complete();
    String result = FileUtils.readFileToString(new File(txtOutputPath + "/part-00000"));
    assertEquals("Practice\nHope\nHorse\n", result);
}

Example 7 with Scheme

use of cascading.scheme.Scheme in project parquet-mr by apache.

the class TestParquetTupleScheme method testReadWrite.

public void testReadWrite(String inputPath) throws Exception {
    createFileForRead();
    Path path = new Path(txtOutputPath);
    final FileSystem fs = path.getFileSystem(new Configuration());
    if (fs.exists(path))
        fs.delete(path, true);
    Scheme sourceScheme = new ParquetTupleScheme(new Fields("first_name", "last_name"));
    Tap source = new Hfs(sourceScheme, inputPath);
    Scheme sinkScheme = new TextLine(new Fields("first", "last"));
    Tap sink = new Hfs(sinkScheme, txtOutputPath);
    Pipe assembly = new Pipe("namecp");
    assembly = new Each(assembly, new UnpackTupleFunction());
    Flow flow = new HadoopFlowConnector().connect("namecp", source, sink, assembly);
    flow.complete();
    String result = FileUtils.readFileToString(new File(txtOutputPath + "/part-00000"));
    assertEquals("Alice\tPractice\nBob\tHope\nCharlie\tHorse\n", result);
}