Bigdata ideas

We have a task with description. Thare is json file (events.json) with events: ... ... {"_t":1507087562,"_p":"sburke@test.com","_n":"app_loaded","device_type":"desktop"} {"_t":1505361824,"_p":"pfitza@test.com","_n":"added_to_team","account":"1234"} {"_t":1505696264,"_p":"keiji@test.com","_n":"registered","channel":"Google_Apps"} ... ... There are about 500000 lines in file (json objects). And only this 3 types of objects possible. _t - is a timestamp _p - email and we can use it as a unique identifier of user. _n - event type (app_loaded - application was loaded by user, registered - user has registered) and last one is additional attribute, device_type, account, channel Task: 1) Load data from json file by events, only app_loaded  and registered in 2 parquet ...

In this article I begin big preparation to finish research work - Using Big Data by police to search serial criminal. Article 1. Dictionaries preparation. We need prepare and load into hive database some new dictionaries- like Districts, road web cams, cars government registration numbers and cars owners information. First of all I download wikipedia table -  List of districts of Bangkok  and save it with Excel as csv file with name bkk_dist_csv.csv Data looks like Download file into Hive table $ hadoop fs -mkdir /user/data/dics  Load with Hadoop WebUI and check  $ hadoop fs -ls /user/data/dics/  Found 1 items -rw-r--r-- 3 dr.who supergroup 1202 2018-04-03 12:01 /user/data/dics/bkk_dist_csv.csv And load it into Hive table drop table IF EXISTS d_src; CREATE EXTERNAL TABLE d_src( code string, eng_name string, thai_Name string ) COMMENT 'source external table for loading scv' ROW FORM...

First of all there is creation of database for studing external tables. Before, look on directory structure $ hadoop fs -ls /user/data Found 6 items -rw-r--r-- 2 hadoop supergroup 161 2018-03-02 14:31 /user/data/cc2.avsc drwxr-xr-x - hadoop supergroup 0 2018-04-03 12:27 /user/data/dics drwxr-xr-x - hadoop supergroup 0 2018-03-15 15:42 /user/data/js1.json drwxr-xr-x - hadoop supergroup 0 2018-03-16 10:52 /user/data/js_db drwxr-xr-x - hadoop supergroup 0 2018-03-02 13:49 /user/data/order.parquet -rw-r--r-- 2 dr.who supergroup 389 2018-02-28 16:10 /user/data/test_data.csv Create new one database with set location folder and setting some properties, like comment and creator. CREATE DATABASE IF NOT EXISTS ext_tabs COMMENT 'Database for studing external tables' LOCATION '/user/data/exttabs' WITH DBPROPERTIES ('creator' = 'Yakushev Aleksey', 'date' = '2018-04-05'); Now che...