Hadoop - Performance Tuning
Which of the following is the correct way to set the Java heap size for a Hadoop container in the configuration?
Which of the following is the correct way to set the Java heap size for a Hadoop container in the configuration?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Understand heap size vs container memory and check options
Java heap size (-Xmx) must be less than container memory to avoid errors. mapreduce.map.memory.mb=2048\nmapreduce.map.java.opts=-Xmx1536m sets container memory to 2048 MB and heap to 1536 MB, which is valid. Others have heap larger than container memory, causing errors.Final Answer:
mapreduce.map.memory.mb=2048\nmapreduce.map.java.opts=-Xmx1536m -> Option BQuick Check:
Heap size < container memory [OK]
Quick Trick: Heap size must be smaller than container memory [OK]
Common Mistakes:
- Setting heap size larger than container memory
- Using inconsistent units (MB vs GB)
- Forgetting to set Java opts after memory
Master "Performance Tuning" in Hadoop
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