Re: Should replica placement change after a topology change?

On Fri, Sep 11, 2015 at 7:24 AM, Richard Dawe wrote: > Thanks, Nate and Rob. We are going to have to migrate some installations > from SimpleSnitch to Ec2Snitch, others to GossipingPropertyFileSnitch. Your > help is much appreciated! > If I were operating in a

Tag filtering data model

I store documents submitted by users, with optional tags (lists of strings): CREATE TABLE doc ( user_id uuid, date text, // part of partition key, to distribute data better doc_id uuid, tags list, contents text, PRIMARY KEY((user_id, date), doc_id) ); What is the best way to

Re: High CPU usage on some of nodes

I have another datapoint from our monitoring system that shows huge outbound network traffic increase for the affected boxes during these spikes: [image: Inline image 1] Looking at inbound traffic, it is increased on nodes other than these (purple, yellow and blue) so it does look like some kind

Subscribe again?

I suddenly stopped receiving mails from this mailing list. Do I need to subscribe again? Thanks, Aadil

Re: High CPU usage on some of nodes

again I haven’t read this thread from the beginning so I don’t know which node is which, but if nodes pause for longish GC, then other nodes will likely be saving hints (assuming you are writing at the time), then they will be delivered once the machines become responsive again. I’m just

Re: Subscribe again?

Check your spam folder. On Fri, Sep 11, 2015 at 11:55 AM, Ahamed, Aadil wrote: > I suddenly stopped receiving mails from this mailing list. Do I need to > subscribe again? > > Thanks, > Aadil >

Re: confusion about nodetool cfstats

It's a single node, metric value showing just a single moment in time. Something with historical data, aggregation across the whole cluster, etc. may be better. See SPM for Cassandra or OpsCenter - they come with out of the box reports for Cassandra. Otis -- Monitoring * Alerting * Anomaly

Re: High CPU usage on some of nodes

A quick and dirty way is to run jstack a few times and see if you can spot some common methods where code is spending time. Otis -- Monitoring * Alerting * Anomaly Detection * Centralized Log Management Solr & Elasticsearch Support * http://sematext.com/ On Thu, Sep 10, 2015 at 1:05 AM, Roman

Re: Network / GC / Latency spike

Hi Alain, Nice charts! ;) (attachments came through the list). Since you're using SPM for monitoring Cassandra, you may want to have a look at https://sematext.atlassian.net/wiki/display/PUBSPM/Network+Map which I think would have shown which nodes were talking to which nodes and how much.

Re: How to run any application on Cassandra cluster in high availability mode

Hi Vikram, Running a monitor somewhere other than on Cassandra node itself hmm then you'd miss out on JVM metrics, OS metrics, ability to do transaction tracing, on demand profiling, etc. which are all nice things to have when you are troubleshooting issues, performance, doing stress

Re: Best strategy for hiring from OSS communities.

Hey Kevin - I think there is j...@apache.org Otis -- Monitoring * Alerting * Anomaly Detection * Centralized Log Management Solr & Elasticsearch Support * http://sematext.com/ On Thu, Aug 13, 2015 at 6:02 PM, Kevin Burton wrote: > Mildly off topic but we are looking to

Re: Should replica placement change after a topology change?

Thanks, Nate and Rob. We are going to have to migrate some installations from SimpleSnitch to Ec2Snitch, others to GossipingPropertyFileSnitch. Your help is much appreciated! Best regards, Rich On 10/09/2015 20:33, "Nate McCall" > wrote: