First time poster here, please let me know if I'm missing anything to help diagnose this...
I believe I've found an issue but wasn't sure exactly where. It has to do with using websockets. I know that the websocket feature is enabled using additional plugins but I've tried two websocket plugins and found that they both act exactly the same way suggesting (though not conclusively) that this may be an issue inside jmeter. My issue is that large websocket responses from our web socket based service are truncated to 4096 bytes. That number seems suspicious in that it's obviously exactly 4k. The two plugins I've tried using are: https://bitbucket.org/pjtr/jmeter-websocket-samplers/branches and https://github.com/fshutdown/JMeter-WebSocketSampler You can find my sample JMX file here: https://agcloud.auto-graphics.com/index.php/s/BbFZrIdaiFcL4p3/download That JMX file has both samplers configured but only the "jmeter-websocket-samplers" is enabled. To switch to the other websocket plugin, disable the samplers where the name starts with "WS ", then enable the samplers where the name starts with "NWS ". In both cases, the "Retrieve Results number 1" sampler gets truncated as evidenced by the fact that the returning JSON is badly formed and the trailing bytes show a field that's cut off in midstream. While I'm not a developer, I can read code and make some rudimentary changes. As a crazy test, I downloaded the source to jmeter and replaced any occurrence of "4096" that looked like it could be buffer size related and changed it to 16384. To that end, I modified the below using a copy of the source I downloaded yesterday (May 9th, 2023): src/core/src/main/java/org/apache/jmeter/save/converters/SampleResultConverter.java lines 461 and 462 src/jorphan/src/main/java/org/apache/jorphan/util/JOrphanUtils.java line 45 src/protocol/http/src/main/java/org/apache/jmeter/protocol/http/sampler/HTTPFileImpl.java line 55 src/protocol/tcp/src/main/java/org/apache/jmeter/protocol/tcp/sampler/BinaryTCPClientImpl.java line 124 src/protocol/tcp/src/main/java/org/apache/jmeter/protocol/tcp/sampler/TCPClientImpl.java line 103 Building using the above modifications had no effect on my truncated web socket data. At this point, I'm out of my league and am asking for help. For environment information, I'm running jmeter v5.5. java --version, produces this output: openjdk 13.0.2 2020-01-14 OpenJDK Runtime Environment (build 13.0.2+8) OpenJDK 64-Bit Server VM (build 13.0.2+8, mixed mode, sharing) The host OS is Windows 10 Pro, Version 22H2, OS Build 19045.2846. Any help would be greatly appreciated. Oliver Weiler Director of IT O: (909) 569-1542 | C: (909) 753-9277 | o...@auto-graphics.com 15218 Summit Ave, Suite 300, Box #240 Fontana, CA 92336 ________________________________ The contents of this e-mail and any attachments are intended solely for the use of the named addressee(s) and may contain confidential and/or privileged information. Any unauthorized use, copying, disclosure, or distribution of the contents of this e-mail is strictly prohibited by the sender and may be unlawful. If you are not the intended recipient, please notify the sender immediately and delete this e-mail.
