Hi Asad,
First, you need to understand the factors impacting cluster capacity. Some of
the important factors to be considered while doing capacity planning of
Cassandra are:
1. Compaction strategy: It impacts disk space requirements and IO/CPU/memory
overhead for compactions.
2. Replication Factor: Impacts disk space.
3. Business SLAs and Data Access patterns (read/write)
4. Type of storage: SSD will ensure that IO is rarely a problem. You may become
CPU bound first.
Some trigger points for expanding your cluster:
1. Disk crunch. Unable to meet free disk requirements for various compaction
strategies.
2. Overloaded nodes: tpstats/logs show frequent dropped mutations.
Consistently high CPU load.
3. Business SLAs not being met due to increase in reads/writes per second.
Please note that this is not an exhaustive list.
ThanksAnuj
Sent from Yahoo Mail on Android
On Thu, Jun 29, 2017 at 7:15 PM, ZAIDI, ASAD A<az1...@att.com> wrote:
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Hello Folks,
I’m on Cassandra 2.2.8 cluster with 14 nodes , each with around 2TB of data
volume. I’m looking for a criteria /or data points that can help me decide when
or if I should add more nodes to the cluster and by how many nodes.
I’ll really appreciate if you guys can share your insights.
Thanks/Asad
