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From Harsh J <ha...@cloudera.com>
Subject Re: Can I use MapWritable as a key?
Date Wed, 20 Jul 2011 06:07:20 GMT
If your key is a "fixed" one of four attributes, why not simply use an
ArrayWritable of Text objects, over a MapWritable?

On Wed, Jul 20, 2011 at 5:32 AM, Choonho Son <choonho.son@gmail.com> wrote:
> I am newbie.
>
> Most of example shows that,
> job.setOutputKeyClass(Text.class);
>
> is it possible job.setOutputKeyClass(MapWritable.class);
>
> because my key is combination of values(src IP, src Port, dst Port,
> dst IP), so I want to use MapWritable as a key.
>
> example code is like:
>
> MapWritable mkey = new MapWritable();
> MapWritable mval = new MapWritable();
>
> mkey.put(new Text("sip"), new Text(array[3]));
> mkey.put(new Text("sport"), new Text(array[5]));
> mkey.put(new Text("proto"), new Text(array[7]));
> mkey.put(new Text("dport"), new Text(array[6]));
> mkey.put(new Text("dip"), new Text(array[4]));
>
>
> mval.put(new Text("bcount"), new IntWritable(bcount));
> mval.put(new Text("pcount"), new IntWritable(pcount));
>
> context.write(mkey, mval);
>



-- 
Harsh J

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