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You tried migrating a Hadoop job to AWS EMR but got an error: AccessDeniedException. What is the most likely cause?

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Hadoop - Modern Data Architecture with Hadoop
You tried migrating a Hadoop job to AWS EMR but got an error: AccessDeniedException. What is the most likely cause?
AThe EMR cluster is not running
BThe IAM role lacks permissions to access S3 bucket
CThe Hadoop job jar file is corrupted
DThe AWS CLI version is outdated
Step-by-Step Solution
Solution:
  1. Step 1: Analyze the error type AccessDeniedException

    This error usually means permission issues, especially with AWS IAM roles.
  2. Step 2: Identify common permission problems in EMR migration

    AccessDeniedException often occurs if the EMR cluster's IAM role cannot read the S3 bucket containing job files.
  3. Final Answer:

    The IAM role lacks permissions to access S3 bucket -> Option B
  4. Quick Check:

    AccessDenied = permission issue [OK]
Quick Trick: AccessDenied usually means permission problem [OK]
Common Mistakes:
  • Blaming corrupted jar without checking permissions
  • Assuming cluster state causes access errors
  • Ignoring IAM role permissions

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