Hi Brian,
I am new to the elasticSearch and currently working with version 1.5.1. I
am working on parsing a json string returned by getSourceAsString() method
into an object. JsonParser class in elasticsearch (import
org.elasticsearch.common.jackson.core.JsonParser) doesn't allow me to
create an instance of it to use it's method readValueAs(class name).
I would like to use elasticsearch apis as much as I can instead of
including Jackson jar separately in my code. Can you please show me the
JsonParser code you used to convert a string into an object ??
Thanks,
Swati
On Tuesday, March 12, 2013 at 11:26:47 AM UTC-4, Brian wrote:
>
> Just an FYI... Start with, for example, the following JSON document (all
> on one line for the _bulk API, but pretty printed below). This follows my
> basic document struture: An array of field names, whith each of those
> fields taking either a single value or an array of heterogenous values.
> Nothing more complex than a Map<String,Object> can represent, in which
> Object is either a single type (String, Boolean, and so on) or an
> Array<Object>. A subset of the "throw any JSON document into ES", but still
> a very useful subset that far exceeds any database engine I've ever used:
>
> {
> "_index" : "twitter" ,
> "_type" : "tweet" ,
> "_id" : "3" ,
> "_score" : 1.0 ,
> "_source" : {
> "user" : "bbthing68" ,
> "postDate" : "2012-11-15T14:12:12" ,
> "altitude" : 45767 ,
> "dst" : true ,
> "prefix" : null ,
> "counts" : [ 1 , 2 , 3.14149 , "11.1" , "13" ] ,
> "vdst" : [ true , false , true ] ,
> "message" : [ 2 , "Just trying this out" , "With one/two multivalued
> fields" ]
> }
> }
>
> Both the SearchHit.getSourceAsString and the GetResponse.getSourceAsString
> methods return the following JSON string (again, it's on one line, but it's
> pretty printed here only for this post):
>
> {
> "user" : "bbthing68" ,
> "postDate" : "2012-11-15T14:12:12" ,
> "altitude" : 45767 ,
> "dst" : true ,
> "prefix" : null ,
> "counts" : [ 1 , 2 , 3.14149 , "11.1" , "13" ] ,
> "vdst" : [ true , false , true ] ,
> "message" : [ 2 , "Just trying this out" , "With one/two multivalued
> fields" ]
> }
>
> I was using the getSourceAsMap methods, which return a Map<String,Object>.
> But when I use the JsonParser in stream parsing mode (as supplied directly
> by ElasticSearch; no need to fetch the full Jackson jar file), I can
> directly stream parse that source *so very much faster*. My overall
> response times are now much lower. And it's also much easier and faster for
> me to just parse the source and pull out only the subset of the fields I
> want instead of try to tell ES which subset of fields I want.
>
> Oh, and when I store the fields from my stream parsing process, I put them
> into a LinkedHashMap<String,Object>. That little bit of overhead keeps the
> keys (field names) in the exact same order as they appear in the source.
> Which is really awesomely cool. No more jumbled order of field names when
> displaying results during testing!
>
>
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