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Comment: minor wording refinements

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There're also other dimensions other than Flink characteristiccharacteristics, including:

  • Record size: to check both the processing (records/s) and data (bytes/s) throughput, we will test the 10B, 100B and 1KB record size for each Flink test job.
  • Resource for each task: we will use the Flink default settings to cover the most used cases.
  • Job Parallelism: we will increase the parallelism to saturate the system until back-pressure. 
  • Source and Sink: to focus on Flink performance, we generate the source data randomly and use a blackhole consumer as the sink.

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