Thank you folks! It was very helpful
Regards, Nitan Cell: 510 449 9629 > On Sep 20, 2019, at 8:04 PM, Jonathan Koppenhofer <j...@koppedomain.com> > wrote: > > We do this without containers quite successfully. As precaution, we... > - have dedicated disk per instance. > - have lots of network bandwidth, but also throttle throughout defaults. Also > monitor network closely > - share CPU completely. Limit Cassandra settings to limit CPU use (concurrent > threads, compaction throughput, etc) and monitor closely. > - have plenty of memory on top of jvm allocation > - never have 2 nodes from the same cluster on a single node. > - use VIPs so each instance gets its own IP address. > - use sane OS defaults as documented by Amy Tobey. > > That said, using cgroups or containers would provide better isolation (but > worse bursting) when available. > > >> On Fri, Sep 20, 2019, 8:42 PM Sandeep Nethi <nethisande...@gmail.com> wrote: >> Hi Nitan, >> >> You shouldn’t have any issues if you setup things properly. >> >> Few possible issues could be (can become a bottleneck) >> >> * CPU allocation (Instances can compete) >> * Disk throughput & IOPS & >> * Port allocations >> * Network throughout >> * Consistency issues. >> >> And we have work around for all above, >> >> * CPU: Use jvm file to limit number of CPU cores for each instance. >> * DISK: If possible allocate dedicated disks for each instance. >> * NETWORK & Ports: Have a secondary NIC (or equivalent to num of >> instances). This will give you the flexibility to have Cassandra on same >> ports with better networking operations. >> * RACK: having multiple instances on one node can lead to consistency >> problems when a hosted node goes down for some reason with having RACK’s >> defined. So, this is very important to choose when going with this kind of >> setup. >> >> Hope this helps! >> >> Thanks, >> Sandeep.Nethi >> >> >> >>> On Sat, 21 Sep 2019 at 12:20 PM, Nitan Kainth <nitankai...@gmail.com> wrote: >>> I am looking for possible issues doing this setup without containers. >>> >>> >>> Regards, >>> Nitan >>> Cell: 510 449 9629 >>> >>>> On Sep 20, 2019, at 5:22 PM, Elliott Sims <elli...@backblaze.com> wrote: >>>> >>>> A container of some sort gives you better isolation and less risk of a >>>> mistake that could cause the instances to conflict in some way. Might be >>>> better for balancing resources between them as well, though using cgroups >>>> directly can also accomplish that. >>>> >>>> On Fri, Sep 20, 2019, 8:27 AM Nitan Kainth <nitankai...@gmail.com> wrote: >>>>> Hi There, >>>>> >>>>> Any feedback pros/cons for having multiple instances of C* on the same >>>>> machine without Docker/container solution? >>>>> >>>>> The plan is to change the ports and run multiple C* processes, so we can >>>>> isolate two applications as two different clusters.
