https://issues.apache.org/bugzilla/show_bug.cgi?id=56961

            Bug ID: 56961
           Summary: Add 'Start from line', 'Step by' parameters to CSV
                    Dataset Config, also enabling it to read random lines
           Product: JMeter
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Main
          Assignee: [email protected]
          Reporter: [email protected]

These parameters can help to better control test data. For distributed
environments these parameters will be more valuable, since they can avoid the
need to split CSV data file across JMeter slaves.

'Start from line' defines from what line, in a CSV Data file, JMeter will start
reading when the first thread requires it. Defaults to 1 (one). If set to 0 or
below it will start reading from a random line.

'Step by' defines how many lines will be skipped before reading from CSV file.
For example, if 'Step by' is set to 5 then JMeter CSV reader will read lines 1,
6, 11 and so on. If this parameter is set to 0 (zero) no further lines will be
read.

'Read random lines' defines if JMeter will read lines sequentially, if false
(default), from CSV file or randomly, if set to true. This parameter would be a
combination of the two parameters above. If 'Start from line' is set to 0 or
less then JMeter CSV reader will read a random line from CSV file for its first
thread. If 'Step by' is set to -1 (or any negative number, to prevent errors)
then a random line will be read from CSV file every time it is required to.

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