How can tuning speculative execution help prevent slow or failed Hadoop jobs in a cluster with uneven node performance?

hard📝 Application Q9 of 15

Hadoop - Performance Tuning

AEnable speculative execution to run duplicate tasks on faster nodes

BDisable speculative execution to avoid duplicate task overhead

CSet speculative execution only for reducers to speed reduce phase

DIncrease speculative execution timeout to delay duplicates

Step-by-Step Solution

Solution:

Step 1: Understand speculative execution purpose
It runs duplicate tasks on other nodes to finish slow tasks faster.
Step 2: Apply to uneven node performance
Enabling it helps avoid slowdowns caused by slow or failing nodes by using faster nodes.
Final Answer:
Enable speculative execution to run duplicate tasks on faster nodes -> Option A
Quick Check:
Speculative execution enabled = Faster job on uneven cluster [OK]

Quick Trick: Enable speculative execution to handle slow nodes [OK]

Common Mistakes:

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