question Hbase Region Server and Data Node Decommission in Archives of Support Questions (Read Only)

Hbase Region Server and Data Node Decommission

vtpcnk — Tue, 28 Feb 2017 22:08:05 GMT

If we are going to decomm a data node on which a region server is also running :

1. first - is that a viable option? Can a data node be decommissioned when a region server is also running on that host? Doesn't the region server have/use data on that data node - if so, then how can the data node be decommissioned?

2. let us suppose to due some severed hardware error the node has to be decommed. Then is it necessary to shift the region server on to another node? Or (if there is no real issue with the hardware etc) can a region server exist on a machine without a data node on it?

3. Is there anything to be done to HBASE/Region Server (maintenance mode etc) when you decommission a data node?

Appreciate the insights.

Re: Hbase Region Server and Data Node Decommission

aervits — Wed, 01 Mar 2017 05:12:52 GMT

1. Yes, you have to go to host and decommission RS first, it will put HBase RS into drain mode, then you can continue with decommissioning DN.

2. RS can live without DN but due to data locality it is best to coexist

3.see #1

https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.5.3/bk_administration/content/ch_slave_nodes.html

Re: Hbase Region Server and Data Node Decommission

KPG1 — Thu, 26 May 2022 10:20:35 GMT

can we directly Decommission the HBase region server after adding the new region server to the HBase?will there be any data loss?

Re: Hbase Region Server and Data Node Decommission

cjervis — Thu, 26 May 2022 12:09:26 GMT

@KPG1

As this is an older post we recommend starting a new thread. This will provide the opportunity to provide details specific to your environment that could aid others in providing a more accurate answer to your question.