why talend data transfer slow intermittently?

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We are suddenly experiencing slow transfer rate while transferring data from Hive database to SQL server. This behavior is inconsistent and transfer rate drops to 1,211 rows/second on bad days.

Job_statistics

The rows highlighted with red are good days where we experience a good transfer rate.

The job layout is as below the marked component is where we experience slow transfer rate.

job layout

part -1

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part-2

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The staging table metrics is as below.

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