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Hadoop - How to emit TwoDArrayWritable


Hadoop - How to emit TwoDArrayWritable

By : marcel
Date : November 19 2020, 01:01 AM
I think the issue was by ths following , The class you specify in the default constructor (in super) should be the class of the values, not of the overall class itself. So you probably want:
code :
public TwoDArrayWritables() {
    super(IntWritable.class);

}


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Hadoop WordCount Example- Run On Hadoop(Eclipse) option is not prompting Select Hadoop server to run on window

Hadoop WordCount Example- Run On Hadoop(Eclipse) option is not prompting Select Hadoop server to run on window


By : Gulam Mustafa
Date : March 29 2020, 07:55 AM
I hope this helps . I am trying to run word count example on Eclipse. Generally when we click on "run on hadoop" option in eclipse we get a new window asking to select server location. But, now it is directly running the program without asking me to choose an existing server from list below. , Add the following 2 lines in your code :
code :
config.addResource(new Path("/HADOOP_HOME/conf/core-site.xml"));
config.addResource(new Path("/HADOOP_HOME/conf/hdfs-site.xml"));
How to emit 2D double array from mapper using TwoDArrayWritable

How to emit 2D double array from mapper using TwoDArrayWritable


By : user1965823
Date : March 29 2020, 07:55 AM
To fix this issue I want to emit a 2D double array using TwoDArrayWritable as value .
code :
 TwoDArrayWritable array = new TwoDArrayWritable (DoubleWritable.class);
 DoubleWritable[][] myInnerArray = new DoubleWritable[10][];
 // set values in myInnerArray
 array.set(myInnerArray);
 context.write(key, array);
Which to use : Custom datatype or TwoDArrayWritable

Which to use : Custom datatype or TwoDArrayWritable


By : skily
Date : March 29 2020, 07:55 AM
will help you You'll definitely need to write a custom class for your Key as TwoDArrayWritable doesn't implement WritableComparable (even if you just extend the TwoDArrayWritable class to add the interface and compareTo method).
As for whether you should use TwoDArrayWritable over a custom class - depends on a couple of factors (in my opinion):
Customizing TwoDArrayWritable in Hadoop and Not able to iterate the same in reducer

Customizing TwoDArrayWritable in Hadoop and Not able to iterate the same in reducer


By : Ashutosh Singhal
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You have not defined the set method in MyTwoDArrayWritable, that is why that error is shown. Instead of calling array.set, you should use the method you have already defined which does exactly what you need: setValues, so replace
code :
array.set(myInnerArray,myInnerArray1); 
array.setValues(myInnerArray,myInnerArray1); 
Row column value in TwoDArrayWritable

Row column value in TwoDArrayWritable


By : Ibrahim Magdy
Date : March 29 2020, 07:55 AM
wish helps you First of all, please don't call a variable getArray, as it leads to confusion because it looks like a method name. To iterate over each of the matrices, you need to do the following:
code :
for (DoubleTwoDArrayWritable value : values) {
    Writable[][] currentArray = value.get();
    for (int i = 0; i < currentArray.length; i++) {
        for (int j = 0; j < currentArray[i].length; j++) {
             DoubleWritable valueYouWant = (DoubleWritable)currentArray[i][j];
        }
    }
}
for (DoubleTwoDArrayWritable value : values) {
    Writable[][] currentArray = value.get();
    int rowSize = currentArray.length;
    int columnSize = currentArray[0].length;
    double[][] myArray = new double[rowSize][columnSize];

    for (int i = 0; i < currentArray.length; i++) {
        for (int j = 0; j < currentArray[i].length; j++) {
             myArray[i][j] = ((DoubleWritable)currentArray[i][j]).get();
        }
    }
}
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