Re: TWCS and gc_grace_seconds

Thanks Jeff, I just checked with business and we have differences in having TTL. So it will be manula purging always. We do not want to use LCS due to high IOs. So: 1. As the use case is of time series data model, TWCS will be give some benefit (without TTL) and with frequent deleted data

Re: TWCS and gc_grace_seconds

Hi Adarsh, You will have problems if you manually delete data when using TWCS. To fully understand why, I recommend reading this The Last Pickle post: https://thelastpickle.com/blog/2016/12/08/TWCS-part1.html And this post I wrote that dives deeper into the problems with deletes: http://www.red

loosing data during saving data from java

Hello all, I have a table cassandra where I insert quickly several java entity about 15.000 entries by minutes. But at the process ending, I only have for exemple 199.921 entries instead 312.212 If I truncate the table and relaunch the process, several time I get 199.354 or 189.012 entries ... not

Re: loosing data during saving data from java

There is no buffer in cassandra that is known to (or suspected to) lose acknowledged writes if it's overwhelmed. There may be a client bug where you send so many async writes that they overwhelm a bounded queue, or otherwise get dropped or timeout, but those would be client bugs, and I'm not sure

Cassandra Recommended System Settings

Hello everyone! Do you have any setting that you would change or tweak from the below list? sudo cat /proc/4379/limits Limit Soft Limit Hard Limit Units Max cpu time unlimitedunlimitedseconds Max file size un

GC Tuning https://thelastpickle.com/blog/2018/04/11/gc-tuning.html

Hello! Is it still better to use ParNew + CMS Is it still better than G1GC these days? Any recommendation for i3.xlarge nodes read-heavy workload? Thanks, Sergio - To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.or

Cassandra Repair question

Hi Cassandra experts, We are on Cassandra 3.11.1. We have to run repairs for a big cluster. We have 2 DCs. 3 RACs in each DC. Replication factor is 3 for each datacenter . So if I run repair on all nodes of a single RAC with "pr" option then ideally it will cover all the ranges. Please cor

Re: Cassandra Repair question

No it will only cover primary ranges of nodes on single rac. Repair with -pr option is to be run on all nodes in a rolling manner. Regards Manish On 19 Oct 2019 10:03, "Krish Donald" wrote: > Hi Cassandra experts, > > > We are on Cassandra 3.11.1. > > We have to run repairs for a big cluster. >

Re: Cassandra Repair question

Thanks Manish, What is the best and fastest way to repair a table using nodetool repair ? We are using 256 vnodes . On Fri, Oct 18, 2019 at 10:05 PM manish khandelwal < manishkhandelwa...@gmail.com> wrote: > No it will only cover primary ranges of nodes on single rac. Repair with > -pr option i

RE: loosing data during saving data from java

Thank Jeff 🙂 but if you save several data to fast with cassandra repository and if cassandra doesn't have the same speed and inserts more slowly. What is the bevahior ? cassandra store the overflow in a additionnal buffer ? No data can be lost on the cassandra's side ? Thank a lot. Adrian