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Closes #
Please check if the PR fulfills these requirements
What kind of change does this PR introduce?
Feature
What is the current behavior?
We export packages in a raw for each topic. It is inefficient when we need data only from few topics.
What is the new behavior?
Now, we download N packages asynchronously, where N = the parallel option / number of topics.
Does this PR introduce a breaking change?
No
Other information: