Hadoop - Performance Tuning
Given a Hadoop job configured with LZO compression, what will happen if the LZO native libraries are missing on the cluster?
Given a Hadoop job configured with LZO compression, what will happen if the LZO native libraries are missing on the cluster?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand LZO dependency
LZO requires native libraries installed on all nodes to work properly.Step 2: Consequence of missing native libraries
If native libraries are missing, Hadoop cannot use LZO codec and the job fails at runtime.Final Answer:
Job will fail with a runtime error -> Option BQuick Check:
LZO missing libs = runtime failure [OK]
Quick Trick: LZO needs native libs; missing causes failure [OK]
Common Mistakes:
- Assuming fallback to other codec
- Thinking job runs without compression
- Confusing with Snappy behavior
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