Hadoop - Cluster Administration
Given the command
hdfs dfs -cat /logs/app1.log | grep ERROR, what is the expected output?Given the command hdfs dfs -cat /logs/app1.log | grep ERROR, what is the expected output?
medium📝 Predict Output Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the command parts
hdfs dfs -cat /logs/app1.logoutputs the file content;grep ERRORfilters lines with 'ERROR'.Step 2: Combine command effects
The pipe sends file content to grep, which shows only lines containing 'ERROR'.Final Answer:
Only lines containing the word 'ERROR' from app1.log -> Option DQuick Check:
grep ERROR filters lines with ERROR [OK]
Quick Trick: Pipe file content to grep ERROR to find error lines [OK]
Common Mistakes:
- Thinking grep removes ERROR lines
- Expecting full file output
- Confusing grep with listing files
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