RE: [EXTERNAL] Bring 2 nodes down

["Durity, Sean R" <SE...@homedepot.com>]

Decommission the two nodes, one at a time (assumes you have enough disk space on the remaining hosts). That will move the data to the remaining nodes and keep RF=3. Then fix the host. Then add the hosts back into the cluster, one at a time. This is easier with vnodes. Finally, run clean-up on the 6 nodes that stayed up to recover disk space.


Sean Durity
lord of the (C*) rings (Staff Systems Engineer – Cassandra)
MTC 2250
#cassandra - for the latest news and updates

From: Alaa Zubaidi (PDF) [mailto:alaa.zubaidi@pdf.com]
Sent: Thursday, December 14, 2017 2:00 PM
To: user@cassandra.apache.org
Subject: [EXTERNAL] Bring 2 nodes down

Hi,
I have a cluster of 8 Nodes, 4 physical machines 2 VMs each physical machine.
RF=3, and we have read/write with QUORUM consistency requirement.

One of the machines needs to be down for an hour or two to fix local disk.
What is the best way to do that with out losing data?

Regards
-- Alaa

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