Re: Disabling opscenter data collection in Datastax community 2.0

You can use OpsCenter in production with DSC/Apache Cassandra clusters. Some features are only enabled with DSE, but the rest work fine with DSC. -Tupshin On Feb 22, 2014 11:20 PM, "user 01" wrote: > I would be using nodetool & JConsole for monitoring. Though it would > be less informative but I

Re: Disabling opscenter data collection in Datastax community 2.0

I would be using nodetool & JConsole for monitoring. Though it would be less informative but I think it will do. Otherwise also I cannot use Opscenter as I am not using the DSE but DSC, in production. So I am not allowed to use it for prod. use, Isn't it ? Not everyone here as well is using DSE hen

Re: [OT]: Can I have a non-delivering subscription?

Yeah, it¹s called a rule. Set one up to delete everything from user@cassandra.apache.org. On 2/22/14, 10:32 AM, "Paul "LeoNerd" Evans" wrote: >A question about the mailing list itself, rather than Cassandra. > >I've re-subscribed simply because I have to be subscribed in order to >send to the li

Re: Queuing System

Thanks Duy Hai for sharing the details. I have a doubt. If for some reason there is a Network Partition or more than 2 Node failure serving the same partition/load and you ended up writing hinted hand-off. Is there a possibility of a data loss? If yes, how do we avoid that? Regards, Jagan --

Re: List support in Net::Async::CassandraCQL ?

Hi Paul, On 23 Feb 2014, at 4:15 am, Paul LeoNerd Evans wrote: > On Sat, 22 Feb 2014 14:03:06 +1100 Jacob Rhoden wrote: >>my $q = $cass->prepare("update contact set name=?, address=? >> where uuid=?")->get; push @f, $q->execute([$name, @address, $uuid]); >>Future->needs_all( @f )->get; >

abusing cassandra's multi DC abilities

Upfront TLDR: We want to do stuff (reindex documents, bust cache) when changed data from DC1 shows up in DC2. Full Story: We're planning on adding data centers throughout the US. Our platform is used for business communications. Each DC currently utilizes elastic search and redis. A message can

Re: Update multiple rows in a CQL lightweight transaction

#5633 was actually closed because the static columns feature ( https://issues.apache.org/jira/browse/CASSANDRA-6561) which has been checked in to the 2.0 branch but is not yet part of a release (it will be in 2.0.6). That feature will let you update multiple rows within a single partition by doin

Loading CQL PDO for CentOS PHP

I'm trying to get CQL going for my CentOS 5 cassandra PHP platform. I've installed thrift, but when I try to make cassandra-pdo or YACassandraPDO for that matter, none of the tests pass. And when I install it with PHP, phpinfo still doesn't show it loading and it doesn't work. Any ideas would be

Re: Queuing System

Without them you have no durability. With them you have guarantees... More than any other system with messaging features. It is a durable CP commit log. Works very well for data pipelines with AP systems like Cassandra which is a different system solving different problems. When a Kafka le

[OT]: Can I have a non-delivering subscription?

A question about the mailing list itself, rather than Cassandra. I've re-subscribed simply because I have to be subscribed in order to send to the list, as I sometimes try to when people Cc questions about my Net::Async::CassandraCQL perl module to me. However, if I want to read the list, I usuall

Re: Queuing System

This seems a bit overkill. We run far more than 100mps (closer to 600) in rabbit with very good latency on a 3 node cluster. It has been very reliable as well. Thunder - Reply message - From: "Jagan Ranganathan" To: Subject: Queuing System Date: Sat, Feb 22, 2014 9:06 AM Thanks Tupsh

Re: Queuing System

We use this same setup also and it works great. Thunder - Reply message - From: "Laing, Michael" To: Subject: Queuing System Date: Sat, Feb 22, 2014 7:31 AM We use RabbitMQ for queuing and Cassandra for persistence. RabbitMQ with clustering and/or federation should meet your high avail

Re: Queuing System

Jagan Few time ago I dealed with a similar queuing design for one customer. *If you never delete messages in the queue*, then it is possible to use wide rows with bucketing and increasing monotonic column name to store messages. CREATE TABLE *read_only_queue *( bucket_number int, insertion

Re: List support in Net::Async::CassandraCQL ?

(resending for the list now I'm subscribed) On Sat, 22 Feb 2014 14:03:06 +1100 Jacob Rhoden wrote: > This perl library has been extremely useful for scripting up data > migrations. I wonder if anyone knows of the easiest way to use lists > with this driver? Throwing a perl array in as a paramete

Re: Queuing System

Thanks Tupshin for your assistance. As I mentioned in the other mail, Yes I am planning to use RabbitMQ for my messaging system. But I wonder which will give better performance if writing directly into Rabbit with Ack support Vs a temporary Queue in Cassandra first and then dequeue and publish i

Re: Queuing System

Hi, Thanks for the pointer. Following are some options given there, If you know where your live data begins, hint Cassandra with a start column, to reduce the scan times and the amount of tombstones to collect. A broker will usually have some notion of what’s next in the sequence and thus be

Re: Queuing System

Hi Joe, If my understanding is right, Kafka does not satisfy the high availability/replication part well because of the need for leader and In-Sync replicas. Regards, Jagan On Sat, 22 Feb 2014 22:02:27 +0530 Joe Stein wrote If performance and availability f

Re: Queuing System

If performance and availability for messaging is a requirement then use Apache Kafka http://kafka.apache.org/ You can pass the same thrift/avro objects through the Kafka commit log or strings or whatever you want. /*** Joe Stein Founder, Principal Consu

Re: Queuing System

Hi Michael, Yes I am planning to use RabbitMQ for my messaging system. But I wonder which will give better performance if writing directly into Rabbit with Ack support Vs a temporary Queue in Cassandra first and then dequeue and publish in Rabbit. Complexities involving - Handling scenarios li

Re: Queuing System

While, historically, it has been true that queuing in Cassandra has been an anti-pattern, it is also true that Leveled Compaction addresses the worst aspect of frequent deletes in Cassandra, and that overall, queuing in Cassandra is nowhere near the anti-pattern that it used to be. This is somethin

Re: Queuing System

We use RabbitMQ for queuing and Cassandra for persistence. RabbitMQ with clustering and/or federation should meet your high availability needs. Michael On Sat, Feb 22, 2014 at 10:25 AM, DuyHai Doan wrote: > Jagan > > Queue-like data structures are known to be one of the worst anti patterns >

Re: Queuing System

Jagan Queue-like data structures are known to be one of the worst anti patterns for Cassandra: http://www.datastax.com/dev/blog/cassandra-anti-patterns-queues-and-queue-like-datasets On Sat, Feb 22, 2014 at 4:03 PM, Jagan Ranganathan wrote: > Hi, > > I need to decouple some of the work being

Re: Disabling opscenter data collection in Datastax community 2.0

On 02/22/2014 06:12 AM, user 01 wrote: I'm using dsc20 (datastax community edition for cassandra 2.0) in production environment. But since I am not authorized to use Opscenter for production use. So how do I disable the data recording that is being done for opscenter consumption, as this is just

Queuing System

Hi, I need to decouple some of the work being processed from the user thread to provide better user experience. For that I need a queuing system with the following needs, High Availability No Data Loss Better Performance. Following are some libraries that were considered along with the limitati

Disabling opscenter data collection in Datastax community 2.0

I'm using dsc20 (datastax community edition for cassandra 2.0) in production environment. But since I am not authorized to use Opscenter for production use. So how do I disable the data recording that is being done for opscenter consumption, as this is just a unusable for me & will put unnecessary

Re: Performance problem with large wide row inserts using CQL

On Fri, Feb 21, 2014 at 11:51 AM, Sylvain Lebresne wrote: > On Thu, Feb 20, 2014 at 10:49 PM, Rüdiger Klaehn wrote: > >> Hi Sylvain, >> >> I applied the patch to the cassandra-2.0 branch (this required some >> manual work since I could not figure out which commit it was supposed to >> apply for, a