You want to quickly find all error messages in Hadoop logs stored in HDFS at /var/log/hadoop. Which command sequence will help you achieve this efficiently?

hard📝 Application Q15 of 15

Hadoop - Cluster Administration

You want to quickly find all error messages in Hadoop logs stored in HDFS at /var/log/hadoop. Which command sequence will help you achieve this efficiently?

Ahdfs dfs -cat /var/log/hadoop/* | grep ERROR

Byarn logs -applicationId * | grep ERROR

Chdfs dfs -ls /var/log/hadoop | grep ERROR

Dhadoop fs -copyToLocal /var/log/hadoop /tmp && grep ERROR /tmp/*

Step-by-Step Solution

Solution:

Step 1: Identify command to read all logs in HDFS directory
hdfs dfs -cat /var/log/hadoop/* outputs all files in that directory.
Step 2: Filter output for error lines
Piping to grep ERROR shows only lines with 'ERROR'.
Final Answer:
hdfs dfs -cat /var/log/hadoop/* | grep ERROR -> Option A
Quick Check:
Cat all logs + grep ERROR = quick error search [OK]

Quick Trick: Cat all logs then grep ERROR to find errors fast [OK]

Common Mistakes:

Using yarn logs without specifying app ID
Using ls which lists files, not content
Copying logs locally is slower and unnecessary

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You want to quickly find all error messages in Hadoop logs stored in HDFS at /var/log/hadoop. Which command sequence will help you achieve this efficiently?

Step 1: Identify command to read all logs in HDFS directory

Step 2: Filter output for error lines

Final Answer:

Quick Check:

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