Spark Performance Tuning | Avoid GroupBy | Interview Question

[@raghavraju5615]

Awesome

[@chaitrah8330]

Thank you. Please show how to use reduceBy in dataframes

[@pareshpal3533]

Helps :)

[@susanthomas223]

What about aggregateByKey function in RDD

[@akshayr3507]

@viresh Hi.. thnkx for the video explaimed well. Could you make a video on GroupBy vs Windows fn. which should be preferred in what use-cases !!

[@SpiritOfIndiaaa]

how can we do percentile() avoiding groupBy ...can you explain it ?

[@lipikapatil4457]

Pls make a video on how Union works for uneven dataframes.

[@TechWithViresh]

Sure, Thnx

[@snehakavinkar2240]

When to use group by over reduce by?

[@sanjaiverma108]

What we if use Dataframe or Dataset, there is no reduceby method

[@sanjaiverma108]

Please reply

[@satyanathparvatham4406]

@@sanjaiverma108 bro he is explaining about reducebykey and groupbykey..not reduceby...infact we have reduce thats an action ,not a transformation where as reducebykey is a transformation

[@SpiritOfIndiaaa]

If one need to use spark-sql how to use reduceByKey ?

[@venkadesanelangovan9073]

Does spark SQL query group by also works the same way?