Exam DP-201 topic 1 question 2 discussion

Actual exam question from Microsoft's DP-201

Question #: 2
Topic #: 1

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
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You are designing an HDInsight/Hadoop cluster solution that uses Azure Data Lake Gen1 Storage.
The solution requires POSIX permissions and enables diagnostics logging for auditing.
You need to recommend solutions that optimize storage.
Proposed Solution: Implement compaction jobs to combine small files into larger files.
Does the solution meet the goal?

A. Yes
B. No

Show Suggested Answer

Suggested Answer: A 🗳️
Depending on what services and workloads are using the data, a good size to consider for files is 256 MB or greater. If the file sizes cannot be batched when landing in Data Lake Storage Gen1, you can have a separate compaction job that combines these files into larger ones.
Note: POSIX permissions and auditing in Data Lake Storage Gen1 comes with an overhead that becomes apparent when working with numerous small files. As a best practice, you must batch your data into larger files versus writing thousands or millions of small files to Data Lake Storage Gen1. Avoiding small file sizes can have multiple benefits, such as:
✑ Lowering the authentication checks across multiple files
✑ Reduced open file connections
✑ Faster copying/replication
✑ Fewer files to process when updating Data Lake Storage Gen1 POSIX permissions
Reference:
https://docs.microsoft.com/en-us/azure/data-lake-store/data-lake-store-best-practices

by chaoxes at Dec. 16, 2020, 8:09 p.m.

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chaoxes

Highly Voted 4 years, 6 months ago

Correct answer

upvoted 7 times

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Deepu1987

Most Recent 4 years, 4 months ago

Somewhat similar to above qn https://docs.microsoft.com/en-us/azure/data-lake-store/data-lake-store-performance-tuning-guidance#structure-your-data-set

upvoted 2 times

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