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Performing Garbage collections in the JVM is not guaranteed. It is up to the JVM to determine if it will perform a GC on our request or not.
By default, DLC operations do not trigger a garbage collection. This can be requested by adding one of the following values to your DLC request: 
{
  "operation": "LOAD",
  "topics": [ "trades" ],
  "performGcOnStart": true,
  "performGcOnCompletion": true
}
These properties run a GC request as follows:
  • "performGcOnStart": before the Operation is executed.
  • "performGcOnCompletion": after the Operation is completed.