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Oracle Big Data Appliance HDFS Replication Related Frequently Asked Questions (FAQ) (Doc ID 1927887.1)

Last updated on AUGUST 02, 2021

Applies to:

Big Data Appliance Integrated Software - Version 2.3.1 and later
Linux x86-64

Purpose

This document provides answers to frequently asked questions about HDFS Replication on Oracle Big Data Appliance (BDA). 

Questions and Answers

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In this Document
Purpose
Questions and Answers
 Is there an fsck command to check for blocks with replication factor of 1?
 Is there  a command to replicate files with replication factor set to 1 instead of default 3?
 Is there a way to delay the Namenode(NN) to start the replication so the HDFS writes and query execution don't conflict?
 In-terms of replication what is difference between decommissioning a  non-critical/secondary node and stopping services on a non-critical/secondary node?
 After recommissioning a non-critical/secondary node with HDFS partitions intact, will the NN take in account the existing data on the DN that just got added?

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