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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