jmeter Only send request with one number generated by __Random() - jmeter

Question

Here are Jmeter script structure:
Test Plan
+ User Defined Variables
+ - votes_id: ${__P(votes_id,${__Random(11,14)})}
+ ...
+ Thread Group
+ + Throughput Controller1
+ + + Http Request1
+ + Throughput Controller2
+ + + Http Request2
+ + Throughput Controller3
+ + + Http Request3
+ + + Http Request4
+ + + - paramater1:${votes_id}
Issue: http request only send with the same num.
when set paramater1:${__Random(11,14)}, it works with random number from 11 to 14.
Note: I have also try components CSV Data Set Config. when I disable Throughput Controller1, Throughput Controller2, Http Request4 works with multi number.
How can I use CSV Data Set Config to send request parameter with random number?
Thanks.

Answer 1

As per Where can functions and variables be used? chapter:
Functions and variables can be written into any field of any test component
As per What can functions do
Functions are shared between threads. Each occurrence of a function call in a test plan is handled by a separate function instance.
So you basically don't need to define a variable, you can use __Random() function directly in the HTTP Request parameter section
Test Plan
+ ...
+ Thread Group
+ + Throughput Controller1
+ + + Http Request1
+ + Throughput Controller2
+ + + Http Request2
+ + Throughput Controller3
+ + + Http Request3
+ + + Http Request4
+ + + - paramater1:${__P(votes_id,${__Random(11,14)})}
This way the function will be evaluated individually by each thread hence you will get a new value each time the function will be called.
Check out Apache JMeter Functions - An Introduction to learn more about JMeter Functions concept.

Answer 2

Don't use User Defined Variables for other then initial values:
Note that all the UDV elements in a test plan - no matter where they
are - are processed at the start.
UDVs should not be used with functions that generate different results
each time they are called. Only the result of the first function call
will be saved in the variable. However, UDVs can be used with
functions such as __P()
For defining variables during a test run, see User Parameters. UDVs
are processed in the order they appear in the Plan, from top to
bottom.
UseUser Parameters and put it as Pre processor child of HTTP request. It'll be called every time.