My default is G1GC using 50% of available RAM (so typically a minimum of 16 GB
for the JVM). That has worked in just about every case I’m familiar with. In
the old days we used CMS, but tuning that beast is a black art with few wizards
available (though several on this mailing list). Today, I just don’t see GC
issues – unless there is a bad query in play. For me, the data model/query
construction is the more fruitful path to achieving performance and reliability.
Sean Durity
From: Jon Haddad
Sent: Tuesday, March 19, 2019 2:16 PM
To: user@cassandra.apache.org
Subject: [EXTERNAL] Re: Garbage Collector
G1 is optimized for high throughput with higher pause times. It's great if you
have mixed / unpredictable workloads, and as Elliott mentioned is mostly set &
forget.
ZGC requires Java 11, which is only supported on trunk. I plan on messing with
it soon, but I haven't had time yet. We'll share the results on our blog (TLP)
when we get to it.
Jon
On Tue, Mar 19, 2019 at 10:12 AM Elliott Sims
mailto:elli...@backblaze.com>> wrote:
I use G1, and I think it's actually the default now for newer Cassandra
versions. For G1, I've done very little custom config/tuning. I increased
heap to 16GB (out of 64GB physical), but most of the rest is at or near
default. For the most part, it's been "feed it more RAM, and it works"
compared to CMS's "lower overhead, works great until it doesn't" and dozens of
knobs.
I haven't tried ZGC yet, but anecdotally I've heard that it doesn't really
match or beat G1 quite yet.
On Tue, Mar 19, 2019 at 9:44 AM Ahmed Eljami
mailto:ahmed.elj...@gmail.com>> wrote:
Hi Folks,
Does someone use G1 GC or ZGC on production?
Can you share your feedback, the configuration used if it's possible ?
Thanks.
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