You execute hdfs dfs -cat /logs/app.log | grep ERROR but no errors appear, despite knowing errors exist. What might cause this?

medium📝 Debug Q6 of 15

Hadoop - Cluster Administration

You execute hdfs dfs -cat /logs/app.log | grep ERROR but no errors appear, despite knowing errors exist. What might cause this?

AThe grep command is case-insensitive by default

BThe log file path is incorrect or the file is empty

CHDFS is down and cannot read files

DThe errors are logged in a different file format

Step-by-Step Solution

Solution:

Step 1: Verify file existence and content
If the file path is wrong or the file is empty, grep returns no output.
Step 2: Consider grep behavior
grep is case-sensitive by default, but if errors exist, they should appear unless file is empty or path wrong.
Final Answer:
The log file path is incorrect or the file is empty -> Option B
Quick Check:
Check file path and content first [OK]

Quick Trick: Check file path and content before grep [OK]

Common Mistakes:

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