Hadoop - Performance Tuning
You want to compress large Hadoop output files with the best compression ratio but can tolerate slower speed. Which codec should you choose and why?
You want to compress large Hadoop output files with the best compression ratio but can tolerate slower speed. Which codec should you choose and why?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Identify compression needs
Best compression ratio means smallest file size, speed is less important.Step 2: Compare codecs by compression ratio and speed
Gzip compresses better but slower; Snappy is fastest but less compression; LZO is in between.Step 3: Choose codec matching needs
Gzip fits best for high compression ratio with slower speed tolerance.Final Answer:
Gzip, best compression ratio with slower speed -> Option AQuick Check:
Best compression ratio = Gzip [OK]
Quick Trick: Best compression ratio usually means Gzip codec [OK]
Common Mistakes:
- Choosing Snappy for best compression ratio
- Thinking LZO compresses better than Gzip
- Avoiding compression despite need to save space
Master "Performance Tuning" in Hadoop
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