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HDFS Balancer on Oracle Big Data Appliance Frequently Asked Questions (FAQ) (Doc ID 2146339.1)

Last updated on AUGUST 25, 2020

Applies to:

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

Purpose

HDFS Balancer frequently asked questions.

Questions and Answers

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In this Document
Purpose
Questions and Answers
 Why would it appear that the bandwidth option is not working? 
 What property should be set to increase the number of threads for the balancer job?
 If the balancer is run in the background is it possible to modify the configuration during balancer execution to increase parameters to speed balancing up?
 If the balancer configuration is changed while the balancer is running what is the impact?
 What happens if a DataNode goes down while the balancer is running?
 Can the rebalance be stopped manually?
 Is it possible to switch from running the balancer in the background to running the balancer with maximum speed in the middle of a rebalance by stopping the current running rebalance?
 If the balancer does not run in the background, so that it runs as fast as possible, is there any impact on cluster services?
 Should the cluster be in a healthy state before running the balancer?
 Do any operations need to be paused when running the balancer at maximum speed i.e. running the balancer not in the background? In other words, will the balancer require that operations subside so that more cluster resources can be dedicated to the balancer?
 Is it normal for the balancer to trigger warnings on the DataNodes?


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