I've tried that. It returns a
org.elasticsearch.hadoop.mr.WritableArrayWritable object. How can I get my
field content out of that?
Le mercredi 3 décembre 2014 14:10:24 UTC+1, Costin Leau a écrit :
>
> That's because your MapWritables doesn't use Strings as keys but rather
> org.apache.hadoop.io.Text
> In other words, you can see the data is in the map however you cannot
> retrieve it since you are using the wrong key (try
> inspecting the map object types).
>
> Try values.get(new Text("title"))
>
>
> On 12/3/14 3:04 PM, Elias Abou Haydar wrote:
> > That works fine for me thank you! But I'd also wanted to be able to
> build and object from the MapWritable values in the
> > mapper.
> >
> > Consider values as MapWritable object.
> > When I try to get a specified value from values.get("title") per example
> the returning value is null but the field
> > exists in the values.keySet()
> >
> > Considering the following code :
> >
> > System.out.println(values.keySet());
> > System.out.println(values.toString());
> > System.out.println("title : " + values.get("title"));
> > System.out.println("category : " + values.get("category"));
> >
> > This is a snippet from the debug output :
> >
> > [title, categoryId]
> > {title=[Samsung EF-CI950BCEGWW S View], categoryId=[3485]}
> > title : null
> > category : null
> >
> > Thanks again!
> >
> > Le mardi 2 décembre 2014 12:36:57 UTC+1, Costin Leau a écrit :
> >
> > Simply specify the fields that you are interested in, in the query
> and you are good to go.
> >
> > [1]
> http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-fields.html
>
> > <
> http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-fields.html>
>
>
> >
> > On 12/2/14 12:52 PM, Elias Abou Haydar wrote:
> > > I'm trying to write a mapreduce job where I can query
> elasticsearch so it can return to me specific fields. Is there any
> > > way to do that?
> > >
> > > My mapping contains about 30 fields and I will need just 4 of them
> ("_id","title","description","category")
> > >
> > > The way I was doing it is to process each answer to get those
> fields, but I'm looking for a cleaner way to do that.
> > >
> > > Any help or suggestion is appreciated.
> > >
> > > Thanks!
> > >
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> >
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> >
> > --
> > Costin
> >
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> --
> Costin
>
>
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