You wrote a script to merge small files using hadoop fs -getmerge, but it fails with an error: "Destination is a directory". What is the likely cause?

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Hadoop - Performance Tuning

You wrote a script to merge small files using hadoop fs -getmerge, but it fails with an error: "Destination is a directory". What is the likely cause?

AYou specified a directory as the output file instead of a file name

BYou used the wrong input directory path

CYou forgot to set Hadoop environment variables

DYou tried to merge files that are too large

Step-by-Step Solution

Solution:

Step 1: Understand getmerge output
The -getmerge command requires the output to be a single file, not a directory.
Step 2: Identify error cause
The error "Destination is a directory" means the output path given is a folder, not a file name.
Final Answer:
You specified a directory as the output file instead of a file name -> Option A
Quick Check:
Output must be a file, not a directory [OK]

Quick Trick: Output path for getmerge must be a file, not folder [OK]

Common Mistakes:

Using directory path as output
Ignoring error message details
Assuming input path causes this error

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You wrote a script to merge small files using hadoop fs -getmerge, but it fails with an error: "Destination is a directory". What is the likely cause?

Step 1: Understand getmerge output

Step 2: Identify error cause

Final Answer:

Quick Check:

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