RE: [EXTERNAL] Re: Running and Managing Large Cassandra Clusters

2020-10-29 Thread Gediminas Blazys
Hey, @Tom I just wanted to clarify when I mention workload in the last email I meant it as the amount of requests the cluster has to serve. Gediminas From: Tom van der Woerdt Sent: Wednesday, October 28, 2020 14:35 To: user Subject: [EXTERNAL] Re: Running and Managing Large Cassandra

Re: Running and Managing Large Cassandra Clusters

2020-10-28 Thread Tom van der Woerdt
f local C* reads, writes and client > requests as well? > > > > You mention repairs, how do you run them? > > > > Gediminas > > > > *From:* Tom van der Woerdt > *Sent:* Wednesday, October 28, 2020 14:35 > *To:* user > *Subject:* [EXTERNAL] Re: R

RE: [EXTERNAL] Re: Running and Managing Large Cassandra Clusters

2020-10-28 Thread Gediminas Blazys
Subject: [EXTERNAL] Re: Running and Managing Large Cassandra Clusters Heya, We're running version 3.11.7, can't use 3.11.8 as it won't even start (CASSANDRA-16091). Our policy is to use LCS for everything unless there's a good argument for a different compaction strategy (I don't think we have

Re: Running and Managing Large Cassandra Clusters

2020-10-28 Thread Tom van der Woerdt
Heya, We're running version 3.11.7, can't use 3.11.8 as it won't even start (CASSANDRA-16091). Our policy is to use LCS for everything unless there's a good argument for a different compaction strategy (I don't think we have *any* STCS at all other than system keyspaces). Since our nodes are

Re: Running and Managing Large Cassandra Clusters

2020-10-28 Thread Joshua McKenzie
A few questions for you Tom if you have 30 seconds and care to disclose: 1. What version of C*? 2. What compaction strategy? 3. What's core count allocated per C* node? 4. Gossip give you any headaches / you have to be delicate there or does it behave itself? Context:

Re: Running and Managing Large Cassandra Clusters

2020-10-28 Thread Tom van der Woerdt
Does 360 count? :-) num_tokens is 16, works fine (had 256 on a 300 node cluster as well, not too many problems either). Roughly 2.5TB per node, running on-prem on reasonably stable hardware so replacements end up happening once a week at most, and there's no particular change needed in the

Running and Managing Large Cassandra Clusters

2020-10-28 Thread Gediminas Blazys
Hello, I wanted to seek out your opinion and experience. Has anyone of you had a chance to run a Cassandra cluster of more than 350 nodes? What are the major configuration considerations that you had to focus on? What number of vnodes did you use? Once the cluster was up and running what would