Examples of cascading.tap.hadoop.Hfs

cascading.tap.hadoop.Hfs
ode> will denote Dfs, and file://... will denote Lfs.
Call {@link #setTemporaryDirectory(java.util.Map,String)} to use a different temporary file directory pathother than the current Hadoop default path.
By default Cascading on Hadoop will assume any source or sink Tap using the {@code file://} URI schemeintends to read files from the local client filesystem (for example when using the {@code Lfs} Tap) where the Hadoopjob jar is started, Tap so will force any MapReduce jobs reading or writing to {@code file://} resources to run inHadoop "standalone mode" so that the file can be read.
To change this behavior, {@link HfsProps#setLocalModeScheme(java.util.Map,String)} to set a different scheme value,or to "none" to disable entirely for the case the file to be read is available on every Hadoop processing node in the exact same path.
Hfs can optionally combine multiple small files (or a series of small "blocks") into larger "splits". This reduces the number of resulting map tasks created by Hadoop and can improve application performance.
This is enabled by calling {@link HfsProps#setUseCombinedInput(boolean)} to {@code true}. By default, merging or combining splits into large ones is disabled.

    }


  @Test
  public void testSplitOnNonSafeOperations()
    {
    Tap source = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo" );
    Tap sink1 = new Hfs( new TextLine(), "foo/split1", true );
    Tap sink2 = new Hfs( new TextLine(), "foo/split2", true );


    Pipe pipe = new Pipe( "split" );


    // this operation is not safe
    pipe = new Each( pipe, new Fields( "line" ), new TestFunction( new Fields( "ignore" ), new Tuple( 1 ), false ), new Fields( "line" ) );

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    }


  @Test
  public void testSplitOnNonSafeOperationsSimple()
    {
    Tap source = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo" );
    Tap sink1 = new Hfs( new TextLine(), "foo/split1", true );
    Tap sink2 = new Hfs( new TextLine(), "foo/split2", true );


    Pipe pipe = new Pipe( "split" );


    // this operation is not safe
    pipe = new Each( pipe, new Fields( "line" ), new TestFunction( new Fields( "ignore" ), new Tuple( 1 ), false ), new Fields( "line" ) );

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  // verify unsafe splits happen when splitting on a pipe
  @Test
  public void testSplitOnNonSafeOperations2()
    {
    Tap source = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo" );
    Tap sink1 = new Hfs( new TextLine(), "foo/split1", true );
    Tap sink2 = new Hfs( new TextLine(), "foo/split2", true );
    Tap sink3 = new Hfs( new TextLine(), "foo/split3", true );


    Pipe pipe = new Pipe( "split" );


    // this operation is not safe
    pipe = new Each( pipe, new Fields( "line" ), new TestFunction( new Fields( "ignore" ), new Tuple( 1 ), false ), new Fields( "line" ) );

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   * We previously would push the each to the next step, but if there is already data being written, save the cpu.
   */
  @Test
  public void testSplitComplex()
    {
    Tap source = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo" );
    Tap sink1 = new Hfs( new TextLine(), "foo/split1", true );
    Tap sink2 = new Hfs( new TextLine(), "foo/split2", true );


    Pipe pipe = new Pipe( "split" );


    pipe = new Each( pipe, new Fields( "line" ), new RegexParser( new Fields( "ip" ), "^[^ ]*" ), new Fields( "ip" ) );

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  /** same as splitComplex, except pipe/branch naming is after the Each, not before */
  @Test
  public void testSplitComplex2()
    {
    Tap source = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo" );
    Tap sink1 = new Hfs( new TextLine(), "foo/split1", true );
    Tap sink2 = new Hfs( new TextLine(), "foo/split2", true );


    Pipe pipe = new Pipe( "split" );


    pipe = new Each( pipe, new Fields( "line" ), new RegexParser( new Fields( "ip" ), "^[^ ]*" ), new Fields( "ip" ) );

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    }


  @Test
  public void testMerge()
    {
    Tap source1 = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo/merge1" );
    Tap source2 = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo/merge2" );


    Tap sink = new Hfs( new TextLine(), "foo" );


    Pipe left = new Each( new Pipe( "left" ), new Fields( "line" ), new RegexFilter( ".*46.*" ) );
    Pipe right = new Each( new Pipe( "right" ), new Fields( "line" ), new RegexFilter( ".*192.*" ) );


    Pipe merge = new GroupBy( "merge", Pipe.pipes( left, right ), new Fields( "offset" ) );

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    }


  @Test
  public void testDupeSource()
    {
    Tap source1 = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo/merge" );
    Tap source2 = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo/merge" );


    Tap sink = new Hfs( new TextLine(), "foo" );


    Pipe left = new Each( new Pipe( "left" ), new Fields( "line" ), new RegexFilter( ".*46.*" ) );
    Pipe right = new Each( new Pipe( "right" ), new Fields( "line" ), new RegexFilter( ".*192.*" ) );
    right = new Each( right, new Fields( "line" ), new RegexFilter( ".*192.*" ) );
    right = new Each( right, new Fields( "line" ), new RegexFilter( ".*192.*" ) );

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    }


  @Test
  public void testDupeSourceRepeat()
    {
    Tap source1 = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo/merge" );


    Tap sink = new Hfs( new TextLine(), "foo" );


    Pipe pipe = new Pipe( "pipe" );


    Pipe merge = new CoGroup( "cogroup", pipe, new Fields( "offset" ), 1, Fields.size( 4 ) );

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    }


  @Test
  public void testDupeSource2()
    {
    Tap source1 = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo/merge" );


    Tap sink = new Hfs( new TextLine(), "foo" );


    Pipe left = new Pipe( "left" );
    Pipe right = new Pipe( "right" );


    Pipe merge = new CoGroup( "cogroup", left, new Fields( "offset" ), right, new Fields( "offset" ), Fields.size( 4 ) );

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    }


  @Test
  public void testDupeSource3()
    {
    Tap source1 = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "foo/merge" );
    Tap source2 = new Hfs( new TextLine( new Fields( "offset", "line" ) ), "bar/merge" );


    Tap sink = new Hfs( new TextLine(), "foo" );


    Pipe left = new Pipe( "left" );
    Pipe middle = new Pipe( "middle" );
    Pipe right = new Pipe( "right" );

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