Re: Increased read latency with Cassandra >= 3.11.7

Dear community, is someone working on this ticket? This is clearly performance regression and we stuck with 3.11.6 and could not upgrade to latest version. Regards, Maxim. On Mon, Feb 22, 2021 at 10:37 AM Ahmed Eljami wrote: > Hey, > I have created the issue, here => > https://issues.apache.or

Re: Reduce num_tokens on single node cluster

On Fri, Jul 30, 2021 at 7:21 PM Bowen Song wrote: > Since you have only one node, sstableloader is unnecessary. Copy/move the > the data directory back to the right place and restart Cassandra or run > 'nodetool > refresh' is sufficient. Do not restore the 'system' keyspace, but do > restore the

Re: Reduce num_tokens on single node cluster

Thanks for quick answer. > Do you ever intend to add nodes to this single node cluster? If not, I > don't see the number of tokens matter at all. > I understand that, I would like to have all environments with the same settings. > However, if you really want to change it and don't mind downtime,

Reduce num_tokens on single node cluster

Hi everyone, I have several development servers with 1 node and num_tokens 256. As preparation for testing 4.0 I would like to change num_tokens to 16. Unfortunately I could not add any additional nodes or additional DC, but I'm fine with downtime. The important part, data should be preserved. Wh

Re: Cassandra 3.11 cqlsh doesn't work with latest JDK

Hi Sean, thanks for the quick answer. I have applied your suggestion and tested on several environments, everything is working fine. Other communication protected by SSL such as server-to-server and client-to-server is working without problems as well. Regards, Maxim. On Fri, Apr 30, 2021 at 3:1

Cassandra 3.11 cqlsh doesn't work with latest JDK

Hi everyone, I have Apache Cassandra 3.11.6 with SSL encryption, CentOS Linux release 7.9, python 2.7.5. JDK and python are coming from operating system. I have updated today operating system and with that I've got new JDK $ java -version openjdk version "1.8.0_292" OpenJDK Runtime Environment (

Repairs on table with daily full load

Hi everyone, There are a lot of articles, and, probably this question was asked already many times, but I still not 100% sure. We have a table, which we load almost full every night with spark job and consistency LOCAL_QUORUM and record TTL 7 days. This is to remove some records if they are not p

Re: Re: Increased read latency with Cassandra >= 3.11.7

Hi, I'm not sure if this will help, but I tried today to change one node to 3.11.9 from 3.11.6. We are NOT using TWCS. Very heavy read pattern, almost no writes, with constant performance test load. Cassandra read latency 99% increased significantly, but NOT on the node where I changed version (to

Re: Re: Increased read latency with Cassandra >= 3.11.7

Hi Nico, we wanted to upgrade to 3.11.8 (from .6), but now I'm very concerned as our load is mostly read-only and very latency sensitive. Did you figure out the reason for such behaviour with the new version ? Regards, Maxim. On Tue, Sep 15, 2020 at 5:24 AM Sagar Jambhulkar wrote: > That is od

Re: [EXTERNAL] How to reduce vnodes without downtime

Hi guys, thanks a lot for useful tips. I obviously underestimated complexity of such change. Thanks again, Maxim. >

How to reduce vnodes without downtime

Hi everyone, with discussion about reducing default vnodes in version 4.0 I would like to ask, what would be optimal procedure to perform reduction of vnodes in existing 3.11.x cluster which was set up with default value 256. Cluster has 2 DC with 5 nodes each and RF=3. There is one more restricti

Re: How to query TTL on collections ?

Hi Alain, thanks a lot for detailed answer. > You can set values individually in a collection as you did above (and > probably should do so to avoid massive tombstones creation), but you have > to read the whole thing at once: > This, actually, is one of the design goals. At the moment I have t

How to query TTL on collections ?

Hi everyone, I'm struggling to understand how can I query TTL on the row in collection ( Cassandra 3.11.4 ). Here is my schema: CREATE TYPE item ( csn bigint, name text ); CREATE TABLE products ( product_id bigint PRIMARY KEY, items map> ); And I'm creating records with TTL like this:

Re: Repairs are slow after upgrade to 3.11.3

Hi Alex, I'm using Cassandra reaper as well. Could be https://issues.apache.org/jira/browse/CASSANDRA-14332 as it was committed in both version. Regards, Maxim. On Wed, Aug 29, 2018 at 2:14 PM Oleksandr Shulgin < oleksandr.shul...@zalando.de> wrote: > On Wed, Aug 29, 2018 at

Re: Repairs are slow after upgrade to 3.11.3

gt; > "The best way to predict the future is to invent it" Alan Kay > > > On Wed, Aug 29, 2018 at 3:06 AM Maxim Parkachov > wrote: > >> Hi everyone, >> >> couple of days ago I have upgraded Cassandra from 3.11.2 to 3.11.3 and I >> see that repa

Repairs are slow after upgrade to 3.11.3

Hi everyone, couple of days ago I have upgraded Cassandra from 3.11.2 to 3.11.3 and I see that repair time is practically doubled. Does someone else experience the same regression ? Regards, Maxim.

Re: Repair daily refreshed table

maybe you are setting > nulls? > > Rahul > On Aug 18, 2018, 11:16 PM -0700, Maxim Parkachov , > wrote: > > Hi Rahul, > > I'm already using LOCAL_QUORUM in batch process and it runs every day. As > far as I understand, because I'm overwriting whole table with

Re: Repair daily refreshed table

ul Singh wrote: > Are you loading using a batch process? What’s the frequency of the data > Ingest and does it have to very fast. If not too frequent and can be a > little slower, you may consider a higher consistency to ensure data is on > replicas. > > Rahul > On Aug 18,

Repair daily refreshed table

Hi community, I'm currently puzzled with following challenge. I have a CF with 7 days TTL on all rows. Daily there is a process which loads actual data with +7 days TTL. Thus records which are not present in last 7 days of load expired. Amount of these expired records are very small < 1%. I have d