Re: Upgrade from 2.1 to 3.11

I am surprised that no one else ran into any issues with this version. GC can't catch up fast enough and there is constant Full GC taking place. The result? unresponsive nodes makeing entire cluster unusable. Any insight on this issue from anyone that is using this version would be appreciated.

Nodetool refresh v/s sstableloader

Hi Cassandra users, Cassandra dev, When recovering using SSTables from a snapshot, I want to know what are the key differences between using: 1. Nodetool refresh and, 2. SSTableloader Does nodetool refresh have restrictions that need to be met? Does nodetool refresh work even if there is a

Re: bigger data density with Cassandra 4.0?

Although the extent of benefits depend on the specific use case, the cluster size is definitely not a limiting factor. Dinesh > On Aug 27, 2018, at 5:05 AM, kurt greaves wrote: > > I believe there are caveats that it will only really help if you're not using > vnodes, or you have a very

Re: 2.2 eats memory

I just checked our monitoring and we are measuring MemAvailable from  /proc/meminfo which is consistent with available memory reported by free and top. Thanks for pointing that out. Would be nice if that would have been the problem... Cheers, Matthias Aug 27, 2018, 2:11 PM by

Re: 2.2 eats memory

I'm thinking it's unlikely that top is lying to you. Are you sure that you're measuring free memory versus available memory? Cassandra will utilise the OS page cache heavily, which will cache files in memory but leave the memory able to be reclaimed if needed. Have you checked the output of free?

Re: bigger data density with Cassandra 4.0?

I believe there are caveats that it will only really help if you're not using vnodes, or you have a very small cluster, and also internode encryption is not enabled. Alternatively if you're using JBOD vnodes will be marginally better, but JBOD is not a great idea (and doesn't guarantee a massive

2.2 eats memory

Hi there, after upgrading from 2.1 to 2.2.13, Cassandra eats up all available memory within one week. The following is a diagram of the left available RAM of a single node over the course of a week: https://imgur.com/a/H9BDBxC Nodes are bare metal, 12 cores with