Using 0.20.2...
Is it possible to override the context.write() method in ReduceContext? I have
an entire set of Reducers that I would like to all use a specific function just
before every context.write() but I don't want them to worry about that logic,
just to have it handled transparently.
For instance:
Iterator<Text> vit = values.iterator();
if (trans2 != null) {
key = (Text) trans2.transform(key);
}
while (vit.hasNext()) {
Text item = vit.next();
if (trans1 != null) {
item = (Text) trans1.transform(item);
}
context.write(key, item);
}
The logic before/after the write is often different, and there may be writes
that happen in different cases. I want to move the if->transform functionality
out to the write() function so I can just call context.write(a,b) instead of if
(trans1 !=....
My end-goal is something like this:
protected void reduce(Text key, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
Iterator<Text> vit = values.iterator();
while (vit.hasNext())
context.write(key, vit.next());
}
With the write() method override:
public void write(Text key, Text val) {
if (trans1 != null)
val = trans1.transform(val);
if (trans2 != null)
key = trans2.transform(key);
super.write(key,val);
}
or something similar.
Thanks in advance,
-Ross
--
Ross Nordeen
Computer Networking And Systems Administration
Michigan Technological University
http://www.linkedin.com/in/rjnordee
