- reads => as much as possible - huge stream of requests
- data => 186GB on each node
- the reads are unpredictable
- there's (in the cluster) about 6 billions of records
I'll try change the garbage collector.
Thanks
Pat
On 2019-09-05 16:38, Jeff Jirsa wrote:
Lot of variables
- how many reads per second per machine?
- how much data per machine?
- are the reads random or is there a hot working set?
Some of the suggestions online are old.
CASSANDRA-8150 has some old’ish suggestions if you’re running CMS
collector. Running > 16G heap should consider using G1GC and that’s
tuned quite differently. Amy Tobey has a decent (2.1 era) tuning
guide, I imagine The Last Pickle has one as well (and wouldn’t be
surprised if Pythian and Instaclustr do too).
On Sep 5, 2019, at 7:04 AM, p...@xvalheru.org wrote:
Hi,
sorry to bring such question, but I want to ask what are the best JVM
options for Cassandra node? In solution I'm implementing the Cassandra
serves as read-only storage (of course populated at beginning) - the
records are not changed in time. Currently each Cassandra node's VM
has this configuration 16CPUs and 64GB of RAM. I've set these JVM
options: -Xms4G and -Xmx40G; JDK 1.8.0_221. My question is what's the
best size of memory for Cassandra node and if there's any relation
between number of CPUs and memory size. When I've searched for an
answer I've found that suggested size for node is 8GB of RAM, but I
have doubts.
Thanks
Pat
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