Casting a second vote for Jon Haddad. You can reach out to him on LinkedIn: https://www.linkedin.com/in/rustyrazorblade/
Thanks, Aaron On Fri, Sep 27, 2024 at 3:57 AM guo Maxwell <cclive1...@gmail.com> wrote: > I want to at Jon Haddad 😁 > > Bowen Song via user <user@cassandra.apache.org> 于2024年9月27日周五 16:39写道: > >> Hello Jeff, >> >> I'm not a consultant, but do have some experience on troubleshooting this >> type of issues. >> >> The first thing in troubleshooting is gathering information. You don't >> want to troubleshoot issues blindly. >> >> Some (but not all) important information are CPU usage, network IO, disk >> IO, JVM heap usage, Cassandra query latency, queries/s, dropped messages, >> pending compactions, GC logs, Cassandra logs and system logs. >> >> Also, how is the repair run? Is it subrange repair? Is it incremental >> repair? On Cassandra 3.0.x and 3.x, it's recommended to do subrange full >> (non-incremental) repairs, because incremental repair before Cassandra 4.0 >> has known issues and can cause excessive anti-compaction. If the cluster >> had ever ran an incremental repair, there's some extra steps needed to >> switch to full repairs. Skipping these extra steps will lead to the >> previously repaired but now outdated data permanently remain on all nodes, >> which will not only waste disk space, but also slow down queries and >> increase GC pressure. >> >> Cheers, >> Bowen >> On 27/09/2024 01:33, Jeff Masud wrote: >> >> I'm hoping someone can recommend a good Cassandra consultant. >> >> >> >> We have 12 node cluster spanning across 2 data centers, when doing >> repairs a node will spike and be on responsive or completely die, I’m >> assuming it’s related to very high GC times. >> >> >> >> We're currently running 3.0.30 and looking to upgrade to a newer version >> once we can get a repair successfully. >> >> >> >> Please reach out to me directly. >> >> >> >> Thanks >> >> Jeff >> >> >> >> -- >> >> Jeff Masud >> >> Deasil Works >> >> 818-945-0821 x107 >> >> 310-918-5333 Mobile >> >> jeff@deasil.works >> >> >> >>