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Questions tagged [cassandra]

The tag has no usage guidance.

1
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0answers
37 views

Apache Spark guidance - Can it do what I need?

We're working on a large microservices platform for a company in the live events industry. It's made up of containerized RESTful APIs, mostly built in Node, working with Apache Kafka and Cassandra on ...
5
votes
1answer
189 views

Achieving scalability and ACID with a RDBMS to NoSQL streaming solution

My understanding is that the main feature Cassandra has to offer is linear performance at any scale; meaning that if I know 1 C* node can handle 500 queries or commands per second from my app, then I ...
-1
votes
1answer
211 views

How to implement a scalable exists in large set query

I need to design a system where I need to check if a key exists or not. Currently I am already using aerospike for the cause but my use case is slightly different. I will have a key like this ( A ...
1
vote
1answer
268 views

Exploiting Apache Spark Data

and sorry if the question seems a bit naive. I'm currently reading tutorials about Kafka & Spark and there's something I can't figure out : how to exploit / expose the data Spark received. Here'...
6
votes
1answer
370 views

Using key-value NoSQL DBs relationally

I am new to NoSQL and have always heard of "key-value" DBs like Cassandra or Riak and expected their tables to literally have two columns: a key-col and a value-col. I just started working at a new ...
0
votes
1answer
767 views

Is this Big Data architecture good enough to handle many requests per second?

I want to ask for a review of my big data app plan. I haven’t much experience in that field, so every single piece of advice would be appreciated. Here is a link to a diagram of the architecture: My ...
1
vote
1answer
548 views

Near real-time analytics from Cassandra with frequent updates

We have an activity metrics page where users can select a date period and see other user's aggregated activity (by action) and optionally filter everything by 4 or 5 fields. Actions happen ...
3
votes
0answers
390 views

Expiring counters in Cassandra

So I know that TTL is not available for counters because of design reasons and I've read https://issues.apache.org/jira/browse/CASSANDRA-2103 as well as some other SO questions regarding this but ...
3
votes
3answers
553 views

When dealing with tens of billions of rows in a web app table, would a NoSQL database be noticeably faster than a relational one? [closed]

I'm currently designing a conceptual web app, where users can submit posts, comments, and "like"/"dislike" both of those. However, I am not sure of how to store the (dis)likes, because of how many ...
2
votes
0answers
39 views

Realtime layered time data storage and calculations

I am having a hard time trying to figure out the best way to report on and calculate layered time data. The problem: A person can sign in multiple times, during this sign in there are multiple ...
3
votes
1answer
889 views

How should I store usernames and passwords for user login using php/cassandra?

I am new to NOSQL and Cassandra. I am not sure if I should store usernames and password in Cassandra. If I should, what is the best way to do that? I am getting lots of conflicting ideas from research....
2
votes
1answer
992 views

How to architect frequent updates in No-sql db (Cassandra) - architecture

I'm storing some data in Cassandra, then after analyzing it puts in several table, I have its aggregation as daily, weekly, monthly, yearly basis. But after some time if some user reads the content I'...
1
vote
0answers
435 views

How to aggregating data with Cassandra and Apache Spark using counters?

I using Spark Streaming to roll up the analytic events and push to Cassandra 2.1+ database where data model resembles: CREATE TABLE rollup ( metric_1 text, metric_1_value counter ); The ...
2
votes
1answer
603 views

Handling thousands of cassandra insert/updates

I have mobile app with backend server running in nodejs with cassandra as database. The app is like social network where you can share pictures and follow other people. Some operation like updating ...
3
votes
4answers
1k views

Are NoSQL databases the best choice for more efficiently querying large amounts of data?

We are planning to build a travel website in which we will be integrating multiple APIs (eg. DOTW, GTA, Expedia) for Hotels. I have initially tried to use MySQL but since there are huge amounts of ...
5
votes
1answer
175 views

Economics of scaling, denormalizing NoSQL for personalized content [closed]

I am using Cassandra for a data intensive app. With relatively little operations and deployment experience, the expertise I am looking for is someone that can read the example below and decide whether ...
2
votes
1answer
444 views

Scuttlebutt Reconciliation in the paper “Efficient Reconciliation and Flow Control for Anti-Entropy Protocols”

I am reading the paper "Efficient Reconciliation and Flow Control for Anti-Entropy Protocols"! , I couldn't clearly understand Section 3.2 "Scuttlebutt Reconciliation". Here I extract out some ...
7
votes
3answers
622 views

My Cassandra consultant left me and now I'm thinking about reverting to mysql [closed]

I run a middle size community and some time ago I started to develop social capabilities such as follow, status update, wall etc. For some reason i thought that Cassandra was the right tool for the ...
6
votes
5answers
695 views

Should I use a relational datamodel or Cassandra with ColumnFamily based indexes?

Currently we are working on some storage problems for log data from various servers and communication message logs (HTTP(S), XMPP). There will be many write operations and for read operations we will ...
4
votes
2answers
412 views

Using HBase or Cassandra for a token server

I've been trying to figure out how to use HBase/Cassandra for a token system we're re-implementing. I can probably squeeze quite a lot more from MySQL, but it just seems it has come to clinging on to ...
1
vote
2answers
821 views

what is storing data in constant space?

"bloom filter allows us to store data in constant space" Can someone explain what exactly does that sentence means?
2
votes
3answers
421 views

Where should I include comments in my “self-documenting code”?

I'm currently developing a web-app by myself and have made it a point to use descriptive variable and method names (sometimes at the expense of brevity) in order to minimize commenting. The plan was ...