Advanced Data Analytics Using Python_ With Machine Learning, Deep Learning and NLP Examples ( 2023)

Chapter 7
Analytics at Scale
String line = value.toString();
HashMap<String, ArrayList<String>>
result = instance.mapper_task(line);
for(String k : result.keySet())
{
for(String v : result.get(k))
{
context.write(new
Text(k), new Text(v));
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static class ReducerBDAS extendsReducer<Text,
Text, Text, Text> {
protected void reduce(Text key, Iterable<Text>
values,
Context context) throws IOException,
InterruptedException {
String classname = context.
getConfiguration().get("classname");
try {
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