I was listening to this talk on Data modelling in Cassandra. The speakers makes the general statement that 'writes are faster than reads in Cassandra'. Is this case always true? if so why?

I keep coming across these terms: high cardinality and low cardinality in Cassandra. I don't understand what exactly they mean. what effects they have on queries and what is preferred. Please expl...

I found the following from this post: create table posts(username varchar, time timeuuid, post_text varchar, primary key(username, time)) There will only be as many CF rows as there are variatio...

CREATE TABLE users ( userID uuid, firstname text, lastname text, state text, zip int, age int, PRIMARY KEY (userID) ); I want to construct the following queries: select * from users where ...

I am reading this post on read operations and consistency level in Cassandra. According to this post: For example, in a cluster with a replication factor of 3, and a read consistency level of QUOR...

I have installed cassandra 2.0 successfully. When I try to start cql 3 I get no such option: cassandra -v 2.0.9 ./cqlsh -3 Usage: cqlsh [options] [host [port]] cqlsh: error: no such option: -3

consider this example: create table bite ( id varchar PRIMARY KEY, feedid varchar, score bigint, data varchar ); create index bite_feedid on bite (feedid); create index bite_score on bite (s...

Datastax Java driver (cassandra-driver-core 2.0.2) for Cassandra supports PreparedStatements as well as QueryBuilder API. Any specific advantages using one over the other? Disadvantages? Document...

I want to build a RESTful API with Java and Cassandra 2.x (on Jersey framework). I'm new to both technologies so I would like to ask you is that the correct way to integrate and share Cassandra dri...

Hello Cassandra Experts, How can I get a list of processes in Cassandra cluster (similiar to the show processlist command of MySQL)? Im puzzled as to why I cannot find any posts anywhere about thi...

I am pulling big amount of data from cassandra 2.0, but unfortunately getting timeout exception. My table: CREATE KEYSPACE StatisticsKeyspace WITH REPLICATION = { 'class' : 'SimpleStrategy', 're...

I have been reading this section of the Cassandra docs and found the following a little puzzling: Determine column overhead: regular_total_column_size = column_name_size + column_value_size + 15 c...

I'm trying to get a Double value from a Cassandra table with a double type column. I've created the table in CQL3 syntax: CREATE TABLE data_double ( datetime timestamp, value double, primary ke...

Lets assume I have a Column Family with following schema: CREATE TABLE users ( user_id timeuuid, name varchar, last_name varchar, children list, phone_numbers map, PRIMARY KEY(user_id) ); ...

I have to increase storage volume in an cassandra cluster, the performance and throughput however is still more than enough. My first thoughts were to only add drives. Is it possible to increasing ...

I was trying to insert a specific timeuuid to cassandra and the only way I managed to insert one was using the now() function, because I assume, the now function knows what format the database like...

Possibly my first question in this space. I have been trying to get around this issue from last 2 days. Yeah that seems to be a lot. Here is whats going on To install thrift I am following somewha...

I recently started trying out some noSQL prototypes for a customer. They got a real-time application which does lots of inserts, but less reads(Currently they are using MySql and would like t...

I am using the following Cassandra/CQL versions: [cqlsh 4.0.1 | Cassandra 2.0.1 | CQL spec 3.1.1 | Thrift protocol 19.37.0] I am trying to insert data into a pre-existing CF with case sensitive c...