Hadoop - Performance Tuning
Which of the following is a correct Hadoop command to merge small files into one large file?
Which of the following is a correct Hadoop command to merge small files into one large file?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify command to merge files
The-getmergecommand merges multiple files from HDFS into one local file.Step 2: Check other commands
-copyFromLocalcopies files to HDFS,-lslists files, and-rmdeletes files, so they don't merge files.Final Answer:
hadoop fs -getmerge /input /output/mergedfile -> Option DQuick Check:
Use -getmerge to combine files [OK]
Quick Trick: Use 'hadoop fs -getmerge' to combine small files [OK]
Common Mistakes:
- Confusing copy commands with merging
- Using list or remove commands to merge
- Not specifying output file for merge
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