12 Steps to API Load Testing with Apache JMeter

12 Steps to API Load Testing with Apache JMeter

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  12 Steps toAPI Load Testing with Apache JMeter Dmitry Sotnikov VP, Cloud at WSO2
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  Apache JMeter andAPI load testing ● Apache JMeter™ is a popular free, open source software, designed to load test functional behavior and measure performance ● It was originally designed for testing Web applications but has since expanded to other test functions ● Load-testing your APIs allow you to know in advance what kind of load from subscribers and applications your gateway can sustain
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  Action Plan ● Setup API and install Apache JMeter ● Create the test plan and call request ● Add listener to collect results ● Test single call and then scale up ● Do multiaccount and distributed testing This presentation will guide you through these steps in detail
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  1. Publish yourAPI and subscribe to it ● If using WSO2 API Cloud, get yourself a free trial and follow these tutorials:
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  2. Download andlaunch JMeter 1. Download from: http://jmeter.apache.org/download_jmeter.cgi 2. Unzip the package 3. Start Apache JMeter: ○ sh jmeter.sh on Linux or Mac ○ jmeter.bat on Windows.
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  3. Add yourtest ● Right click the Test Plan node and click the Add / Threads (Users) / Thread Group on the shortcut menu:
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  4. Add APIcall request ● Right click the Thread Group and click the Add / Sampler / HTTP Request on the shortcut menu:
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  5. Copy overserver name and path ● Invoke API in API store’s API console and copy over Server Name and Path to HTTP Request in JMeter:
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  6. Add authorizationheader 1. Right click the HTTP Request node and, on the shortcut menu, click Add / Config Element / HTTP Header Manager 2. In the HTTP Header Manager, click the Add button. A new row will get added to the table of Headers Stored in the Header Manager 3. Set Name to Authorization 4. And copy the Bearer part from API Console
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  7. Add listenerto see results ● Right click the Thread Group node and, on the shortcut menu, click Add / Listener / View Results Tree:
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  8. Test theAPI ● Click the Run button and verify that the API call was successful. If prompted to save the configuration, do so.
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  9. Increase theload ● To be able to test at larger load, go back to the Thread Group node, and increase the Number of Threads and Loop Count:
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  10. See whenand why calls fail ● Check out the Response data tab to see why ● Limits imposed by Subscription Tier you set for the API (e.g. 20 calls / minute) result in “You have exceeded your quota” ● Limits based on your API Cloud subscription level lead to “Your request was blocked due to exceeding the allocated quota. Please contact the API Store owner to resolve this.”
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  11. (Optional) Simulatemore subscribers 1. Create another subscriber account or another application in API Cloud 2. Subscribe to the API 3. Create another HTTP request in Apache JMeter with this new application’s authorization header
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  12. (Optional) Distributedload 1. Deploy Apache JMeter on multiple machines 2. Copy the saved test plan 3. Run the following command line or the corresponding .bat command on Windows: sh jmeter.sh -n -t TestPlan.jmx -l Test1.jtl where -t specifies the saved Test Plan file and -l specifies the output file for the responses
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  API Management Optionson the Market Hosted Service: WSO2 API Cloud free trial at : ● http://wso2.com/cloud/api-cloud Open Source: WSO2 API Manager free download at : ● http://wso2.com/api-management/try-it/