Load Testing using Apache Bench - Post JSON API

Load test using Apache Bench

We have been using Apache Bench to load test our rest microservices. One of the most useful situaiton while performing a load testing, is to change the number of concurrent requests parameter.

Apache Bench is a simple tool which has helped us to do this quick testing to see whether our services break on huge load.

How to Install Apache Bench on Ubuntu - 18.04 LTS

In order to install Apache Bench all you have to do is:

$ sudo apt install apache2-utils

How to execute "ab" for POST API

• First create the JSON body to be posted, add that json data to a file with follwoing syntax:

$ cat my_data.json

 json='{"queryType" : "groupBy","dataSource" : "pixel-feed","dimensions" : [],
"granularity" : "all","filter" : {"type" : "selector","dimension" : 
"pixel_id","value" : "122112"},"intervals" :  ["2018-12-01/2018-12-07"],
"aggregations" : [{"type": "count", "name": "pixel_count"}]}'

     Note: json='<your_json_body>'

• Run the ab load test using the following code:

$ ab -n 2000 -c 40 -T application/json \
   -p my_data.json  http://18.120.22.120:8083/druid/v2/?pretty

    Note: the above api hit's 2000 (n) number of requests with 40 (c) concurrent requests. Remember to add T and p parameters which are very useful for adding content type and data respectively.

More

Type the following to get more detail on ab tool

$ ab -h