The Rotating JTL Listener is a component that can be added to JMeter tests, which has the effect of segmenting JTL output into sequential files. This feature can be especially useful for very large tests, where it would be desirable to break one large JTL file into several smaller files to make them more manageable. Another use case might involve a background process that consumes result files in similarly large tests.
In order to add the Rotating JTL Listener to your test you will first need to install it from the JMeter Plugin Manager. There are only a few parameters which need to be configured:
- Filename – This field specifies the base filename for sequentially generated
JTLoutput files. - Limit samples count in file – Specifies the maximum number of sample rows before moving to the next sequential output file.
Adding this component to your load test has the effect of changing the JTL output to the designated filename, where files are output in a sequence in the form of:
result.jtl → result.1.jtl → result.2.jtl → … result.n.jtl
Each JTL file generated will contain up to the number of lines as the specified sample count limit.
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