Apache Cassandra is an open source distributed database management system. It is designed to handle very large amounts of data spread out across many commodity servers while providing a highly available service with no single point of failure. It is a NoSQL solution.

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Filter rows, but only select most recent row for each Id

I have some code that is processing a lot of tasks. These tasks are either connected to a user or an account. Each Task go through many statuses -> Queued, Started, Error, Postponed, Queued, Started, ...
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129 views

Upgrading Cassandra

my Cassandra version is 1.2.4 and i'm trying to upgrade it to 2.0.5 and i know that in the first part i have to upgrade it to 1.0.14 and after that try to upgrade it to the 2.0.5 , when I try to run ...
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50 views

Update a Record in Cassandra

I'm having the following query while updating a particular record. I've a user Column Family CF as follow:- class User(Model): user_id = UUID(default=uuid.uuid4,primary_key= True) date = ...
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44 views

Cassandra Deployement Architecture

I'm new to Cassandra. I have the responsibility to design a basic deployment architecture for a use case. I'd like to know if my solution is correct, and get advice and recommendations from you. Here ...
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275 views

Strugling with updating a cassandra row in FluentCassandra

I have this problem with using Fluent Cassandra in a test application. All I want to do is set the IsOnline field to true inside the SignIn method, but I keep getting the exception supercolumn ...
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94 views

What kind of database is Cassandra DB?

I was taking some courses to understand better the way Cassandra works (at academy.datastax.com) and by what I gathered it came to me that it is a Key Value Database because of the way it stores data ...
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9 views

How to create multiple graphs with titanDB(+cassandra , +rexster) in the same machine?

I'm experimenting with TitanDB (with Cassandra as storage) + Rexter. I have used different storage.keyspace value for different graphs in Titanrexster-server.xml thn also i m not getting multiple ...
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16 views

Cassandra in a Public Cloud - Which Snitch?

I am planning on deploying Cassandra in a public cloud (like Amazon AWS). The cluster will span multiple zones and regions. The cluster will also require logical DC separation within a given region. ...
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12 views

Cassandra DB Schema for Article, Comment on Comment

What is the efficient way to store the comments on comments in Cassandra so that retrieval will be easy(just through the partition key) e.g. There is article and people can comment on that article. ...
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21 views

Appropriate Design For Notification System

I am using Cassandra to store a list of notifications that have been sent to a user. The few requirements I have are: Order the notifications for each user by time received (DESC) Be able to delete ...
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26 views

How to get Cassendra database dump with data

I need to get a dump(with data) from a remote Cassandra database. I was able to get database schema via following command. How can i get all data in the keyspace? I'm using Cassandra 1.1.9. echo -e ...
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103 views

Cassandra Database limitation

why Cassandra is limited to 65535 records only when stored in batch and loop is encounters 20000 only? I have inserted 20,000 customers but it shows an error like too many values for built statement, ...
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17 views

Running Cassandra on Encypted filesystem

Looking for pointers for running Cassandra on a Linux File system encrypted by open source tools. Will this satisfy "data-at-rest" encryption ? Is the encryption transparent to Cassandra DB ...
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68 views

Cassandra - save file

I'm new with Cassandra, and even more - I never have such task for habitual RDMS systems, like MariaDB or Oracle. So, how can I store file in to Cassandra's table? Preferably using Python-driver, but ...
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29 views

How to connect Cassandra database with Chicago Boss Application?

My cassandra database is on a VMware server. The problem is that I don't find any database adapter which can help me in connecting my cassandra database with my chicago boss(a web framework in Erlang) ...
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40 views

What is the graveyard compaction in cassandra?

Cassandra noob here. While going through the documentation etc, I'm repetitevely finding references to graveyard compaction (and occasionally tombstones), example: $ cassandra-cli [default@unknown] ...