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Exam Certified Data Engineer Professional topic 1 question 25 discussion

Actual exam question from Databricks's Certified Data Engineer Professional
Question #: 25
Topic #: 1
[All Certified Data Engineer Professional Questions]

A Spark job is taking longer than expected. Using the Spark UI, a data engineer notes that the Min, Median, and Max Durations for tasks in a particular stage show the minimum and median time to complete a task as roughly the same, but the max duration for a task to be roughly 100 times as long as the minimum.
Which situation is causing increased duration of the overall job?

  • A. Task queueing resulting from improper thread pool assignment.
  • B. Spill resulting from attached volume storage being too small.
  • C. Network latency due to some cluster nodes being in different regions from the source data
  • D. Skew caused by more data being assigned to a subset of spark-partitions.
  • E. Credential validation errors while pulling data from an external system.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
by Eertyy at Sept. 21, 2023, 9:15 p.m.

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arekm
3 months, 2 weeks ago
Selected Answer: D
D - other answers don't make sense. In particular C - all nodes of the cluster must be in the same region (at least on AWS and Azure; GCP - I don't know, but they have networks spanning regions, so maybe it is possible).
upvoted 2 times
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benni_ale
4 months, 3 weeks ago
Selected Answer: D
D is correct
upvoted 1 times
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AndreFR
8 months ago
A excluded because task queueing does not increase the duration of a task B excluded, spill is writing to storage when a memory is insufficient (not storage insufficient) C excluded, region cannot have a 100 times impact on duration E excluded, no errors mentioned in question
upvoted 1 times
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imatheushenrique
10 months, 3 weeks ago
D. Skew caused by more data being assigned to a subset of spark-partitions.
upvoted 1 times
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vikram12apr
1 year, 1 month ago
Selected Answer: D
because a particular executors are executing majority of data while rest are processing very less. The total execution time depends upon the slowest executors. Answer is D.
upvoted 3 times
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Jay_98_11
1 year, 3 months ago
Selected Answer: D
correct
upvoted 1 times
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kz_data
1 year, 3 months ago
Selected Answer: D
I think D is correct
upvoted 1 times
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sturcu
1 year, 6 months ago
Selected Answer: D
D is correct
upvoted 1 times
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Eertyy
1 year, 6 months ago
D is the correct answer
upvoted 3 times
...
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C (25%)
B (20%)
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