You have a large dataset that needs to be compressed and stored in HDFS. You want fast read access and moderate compression. Which codec should you choose and why?

hard📝 Application Q8 of 15

Hadoop - Performance Tuning

ANo compression, to avoid any overhead

BGzip, because it provides the best compression ratio regardless of speed

CLZO, because it is the slowest but compresses best

DSnappy, because it offers fast decompression and reasonable compression

Step-by-Step Solution

Solution:

Step 1: Define requirements
Need fast read (decompression) and moderate compression ratio.
Step 2: Match codec to requirements
Snappy is optimized for fast decompression and moderate compression, ideal for fast read access.
Final Answer:
Snappy, because it offers fast decompression and reasonable compression -> Option D
Quick Check:
Fast read + moderate compression = Snappy [OK]

Quick Trick: Fast read needs Snappy codec [OK]

Common Mistakes:

Choosing Gzip ignoring speed
Thinking LZO is slowest
Avoiding compression loses storage benefits

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More Hadoop Quizzes

You have a large dataset that needs to be compressed and stored in HDFS. You want fast read access and moderate compression. Which codec should you choose and why?

Step 1: Define requirements

Step 2: Match codec to requirements

Final Answer:

Quick Check:

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