Answer-first summary for fast verification
Answer: The RDD Block Name includes the “*” annotation signaling a failure to cache, Size on Disk is > 0
In the Spark UI's Storage tab with MEMORY_ONLY storage level, the indicators of a non-optimally cached table are: - **B**: The '*' annotation in the RDD Block Name indicates partitions that couldn't be cached due to memory constraints, leading to recomputation. - **C**: Size on Disk > 0 is unexpected for MEMORY_ONLY, as it implies data spillage to disk (which is not allowed in MEMORY_ONLY). This suggests a misconfiguration or unintended storage level usage, impacting performance. Options A (normal for MEMORY_ONLY), D (impossible partition count), and E (irrelevant for MEMORY_ONLY) are incorrect.
Author: LeetQuiz Editorial Team
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What signs in the Spark UI's Storage tab would indicate suboptimal performance of a cached table when using the MEMORY_ONLY storage level?
A
Size on Disk is < Size in Memory
B
The RDD Block Name includes the “*” annotation signaling a failure to cache
C
Size on Disk is > 0
D
The number of Cached Partitions > the number of Spark Partitions
E
On Heap Memory Usage is within 75% of Off Heap Memory Usage
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