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Hint: We say two quantities are correlated when one quantity increases ( decreases ) and the other increases ( decreases ) . We say two
Hint:
We say two quantities are correlated when one quantity increases decreases and the other increases decreases
We say two quantities are anticorrelated when one quantity increases decreases and the other decreases increases
We say two quantities are uncorrelated when there is no obvious relation between them.
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assert answer in answers, 'answer should be one of formatanswersShuffling
point possible graded
Which of the following are true about the shuffle operation in Spark?
You are encouraged to read more about shuffle here.
All Spark operations involve shuffling
Shuffling requires large amounts of network communication which makes the operation expensive
Shuffling is Spark's mechanism for redistributing data across partitions
To avoid shuffling, we should think about ways to leverage existing partitions. For example, leveraging
partial aggregation to reduce data transfer
No communication between worker nodes is required for the shuffling operation
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