Hive lab10

Hive Lab10: Url Data Processing

$ cat  urls
http://yoursite.com/bigdata/mongodb?

name=Raj&age=25&city=hyd
http://yoursite.com/bigdata/spark?

name=Swapna&city=del&desig=se
http://yoursite.com/bigdata/spark?

name=Satwik&age=26&city=hyd
http://yoursite.com/oops/java?

name=Manoj&sex=m&age=35

Url contains , 3 parts of information.

 i) Host name:  

    yoursite.com

ii) Path:

   ex:    bigdata/mongodb

iii) Query string.

   name=Manoj&sex=m&age=35

Hive hase predefined parsers , 
  to extract basic entities of url.

 i) parse_url() ---> udf
 ii) parse_url_tuple() ---> udtf.


hive> create database urls;
OK
Time taken: 1.727 seconds
hive> use urls;
OK
Time taken: 0.019 seconds
hive> create table raw(line string);
OK
Time taken: 0.349 seconds
hive> load data local inpath 'urls'
    >  into table raw;
Copying data from 

file:/home/training/urls
Copying file: file:/home/training/urls
Loading data to table urls.raw
OK
Time taken: 0.2 seconds
hive> 

hive> select * from raw;
OK
http://yoursite.com/bigdata/mongodb?

name=Raj&age=25&city=hyd
http://yoursite.com/bigdata/spark?

name=Swapna&city=del&desig=se
http://yoursite.com/bigdata/spark?

name=Satwik&age=26&city=hyd
http://yoursite.com/oops/java?

name=Manoj&sex=m&age=35
Time taken: 0.064 seconds
hive> 

hive> select 
    >     parse_url(line,'HOST'),
    >     parse_url(line,'PATH'),
    >     parse_url(line,'QUERY')
    > from raw;

hive> create table raw2(host string, 
    >  path string, 
    >  query string);
OK
Time taken: 0.039 seconds
hive> insert overwrite table raw2
    >   select x.* from raw
    >  lateral view
    > parse_url_tuple

(line,'HOST','PATH','QUERY')
    >  x as h,p,q;

hive> select * from raw2;
OK
yoursite.com    /bigdata/mongodb       

 name=Raj&age=25&city=hyd
yoursite.com    /bigdata/spark  

name=Swapna&city=del&desig=se
yoursite.com    /bigdata/spark  

name=Satwik&age=26&city=hyd
yoursite.com    /oops/java      

name=Manoj&sex=m&age=35
Time taken: 0.063 seconds
hive> 




hive> create table raw3(host string, 
    >  path array<string>,
    >  qmap map<string,string>);



hive> insert overwrite table raw3
    >  select host, 
    >   split(path,'/'),
    >  str_to_map(query,'&','=')
    > from raw2;

hive> select * from raw3;

hive> select * from raw3;
OK
yoursite.com    

["","bigdata","mongodb"]        

{"age":"25","name":"Raj","city":"hyd"}
yoursite.com    ["","bigdata","spark"] 



{"desig":"se","name":"Swapna","city":"

del"}
yoursite.com    ["","bigdata","spark"] 



{"age":"26","name":"Satwik","city":"hy

d"}
yoursite.com    ["","oops","java"]     

 {"sex":"m","age":"35","name":"Manoj"}
Time taken: 0.064 seconds
hive> 



hive> create table info(host string,  
    >  catogiry string,  course 

string,
    >  name string, age int, 
    >  sex string, city string, desig 

string)
    > row format delimited        
    >   fields terminated by ',';
OK
Time taken: 0.038 seconds
hive> insert overwrite table info
    >   select host, path[1], path[2],
    >  qmap['name'], qmap['age'],
    >  qmap['sex'], qmap['city'],
    >  qmap['desig'] from  raw3;

hive> select * from info;
OK
yoursite.com    bigdata mongodb Raj    

 25      NULL      hyd     NULL
yoursite.com    bigdata spark   Swapna 

 NULL    NULL      del     se
yoursite.com    bigdata spark   Satwik 

 26      NULL      hyd     NULL
yoursite.com    oops    java    Manoj  

 35      mNULL     NULL
Time taken: 0.055 seconds

___________________________________

to extract all keys of a map 

collection/

hive> select  map_keys(qmap)      from 

raw3;

["age","name","city"]
["desig","name","city"]
["age","name","city"]
["sex","age","name"]

hive> select  map_values(qmap)      

from raw3;


["25","Raj","hyd"]
["se","Swapna","del"]
["26","Satwik","hyd"]
["m","35","Manoj"]

____________________________


hive> create table raw4(host string, 
    >   k   array<string>,
    >  v array<string>);
OK
Time taken: 0.037 seconds
hive> insert overwrite table raw4
    >   select host, 
    >     map_keys(qmap), map_values

(qmap) 
    >   from raw3;


hive> select * from raw4;
OK
yoursite.com    ["age","name","city"]  

 ["25","Raj","hyd"]
yoursite.com    

["desig","name","city"] 

["se","Swapna","del"]
yoursite.com    ["age","name","city"]  

 ["26","Satwik","hyd"]
yoursite.com    ["sex","age","name"]   

 ["m","35","Manoj"]
Time taken: 0.061 seconds
hive> 


__________________________________