Hadoop - Cluster Administration
A Hadoop cluster has 20 nodes with 64 GB RAM each. You want to run a memory-intensive job requiring 1.5 TB RAM total. How many nodes should you allocate to this job?
A Hadoop cluster has 20 nodes with 64 GB RAM each. You want to run a memory-intensive job requiring 1.5 TB RAM total. How many nodes should you allocate to this job?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate total RAM needed in GB
1.5 TB = 1.5 * 1024 = 1536 GB RAM required.Step 2: Calculate nodes needed
Each node has 64 GB RAM, so nodes = 1536 / 64 = 24 nodes exactly.Step 3: Add buffer for safety
Adding 1 node buffer for stability: 24 + 1 = 25 nodes, but cluster only has 20 nodes.Step 4: Check cluster capacity
Since cluster has only 20 nodes (1280 GB total), cannot allocate 25; must allocate max 20 nodes.Final Answer:
20 nodes -> Option CQuick Check:
RAM needed / RAM per node = nodes needed [OK]
Quick Trick: Divide total RAM by per-node RAM, add buffer [OK]
Common Mistakes:
- Not converting TB to GB
- Ignoring cluster node limit
- Not adding buffer nodes
Master "Cluster Administration" in Hadoop
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