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Subject [Bug 61087] New: Simple Data Writer Async modes only strips response data, still sends request data
Date Fri, 12 May 2017 03:59:55 GMT

            Bug ID: 61087
           Summary: Simple Data Writer Async modes only strips response
                    data, still sends request data
           Product: JMeter
           Version: 3.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Main
  Target Milestone: ---

Our organization occasionally runs fairly large-scale load tests involving 10+
load generation blades in multiple blade centers against large infrastructures.
 During one particular large scale load test involving SAML flows, the
bottleneck in the load testing suite was ultimately the network bandwidth to
the blade centers housing the load generator "master" node that was receiving
all the simple data writer (SDW) CSV data.  Upon investigation it was
determined that even though we were using "Stripped Async" mode for the SDW,
which strips off the RESPONSE data, it was still sending all the REQUEST data
(including a somewhat large SAML document) back to the master. This required us
to run multiple masters each with 3 slaves in order not to eat up a Gigabit
ethernet link to the masters.  However, the blade centers 2 Gigabit uplinks
then ultimately became saturated.

It is my belief that the SDW should only be sending the actual CSV data to the
master.  If my understanding is wrong, perhaps I ought to look into creating my
own custom "CSV Data Writer" or some such thing...

We are planning to capture some tcp dumps to verify this on the latest version
of JMeter and will post more information when we get it.

Thank you,

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