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Apache Cassandra

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Apache Cassandra is a free, open source, distributed, wide column store, NoSQL database management system designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure.

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xemul
xemul commented Nov 23, 2021

The observable class keeps the list of std::function<void(Args...)> subscribers onboard. When set (called) the value notifies all observers about the change. Being void the callback that needs to start an asynchronous operation can do nothing but send it into the background by ignoring the top-most future. It would be nice if observable::operator() returned back a future. This would requir

janusgraph
xmichaelx
xmichaelx commented May 12, 2019

In Chapter 5. Schema and Data Modeling first there is paragraph:

The default cardinality setting is SINGLE. Note, that property keys used on edges and properties have cardinality SINGLE. Attaching multiple values for a single key on an edge or property is not supported.

and then example:

mgmt = graph.openManagement()
follow = mgmt.makeEdgeLabel('follow').multiplicity(MULTI).make()
markuscraig
markuscraig commented Jul 20, 2016

Hey Crew,

Nice job on gocql, I'm a fan...

For my production services, I could use notification events (via callback or channel) when the gocql client disconnects and reconnects to/from Cassandra. This is useful for higher-level application logic (ie: invoke alarms, stop reading from a durable message queue, etc).

After looking through the code, it looks like the connection information is not p

phpfastcache

A high-performance backend cache system. It is intended for use in speeding up dynamic web applications by alleviating database load. Well implemented, it can drops the database load to almost nothing, yielding faster page load times for users, better resource utilization. It is simple yet powerful.

  • Updated Nov 14, 2021
  • PHP
deusaquilus
deusaquilus commented Oct 26, 2021

The .forall pattern is a great way to create an optional filter for a field that could be defined or not:

case class Person(name: String, age: Int)
val nameOpt: Option[String] = Some("Joe")
run { query[Person].filter(p => lift(nameOpt).forall(_ == p.name)) }
// SELECT p.name, p.age FROM Person p WHERE ? IS NULL OR ? = p.name
// (i.e. when nameOpt := None then the `WHERE ? IS NULL`

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50+ DockerHub public images for Docker & Kubernetes - Hadoop, Kafka, ZooKeeper, HBase, Cassandra, Solr, SolrCloud, Presto, Apache Drill, Nifi, Spark, Consul, Riak, TeamCity and DevOps tools built on the major Linux distros: Alpine, CentOS, Debian, Fedora, Ubuntu

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Streaming reference architecture for ETL with Kafka and Kafka-Connect. You can find more on http://lenses.io on how we provide a unified solution to manage your connectors, most advanced SQL engine for Kafka and Kafka Streams, cluster monitoring and alerting, and more.

  • Updated Nov 25, 2021
  • Scala

Created by Apache Software Foundation

Released July 2008

Repository
apache/cassandra
Website
cassandra.apache.org
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