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Frequently Asked Questions (FAQ) For How to Make The Hadoop Cluster Rack Aware (Doc ID 2130145.1)

Last updated on NOVEMBER 11, 2019

Applies to:

Big Data Appliance Integrated Software - Version 4.2.0 and later
Linux x86-64

Purpose

To answer frequently asked questions about Hadoop Cluster Rack Awareness.

Questions and Answers

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In this Document
Purpose
Questions and Answers
  
  
 What does HDFS use rack awareness for?
 Why would additional rack awareness steps be required on the BDA?
 In a cluster with 2 full BDA racks how could the Hadoop cluster be made rack aware?
 Will there be a rebalance operation after assigning rack? What happens to old blocks and how can I check if blocks are replicated rack aware?
 When Starting the setrep operation how can we resolve the GC overhead limit exceed error raised?
 How can we check if the cluster is rack aware and every block has a replica on both racks after the 'setrep 3' operation completes and the cluster is healthy.  


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