Casandra 2.1 is a NoSQL database sponsored by Apache. Use this tag for question specifically for version 2.1.
Questions tagged [cassandra-2.1]
396 questions
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Cassandra permanent ReadTimeoutException
Environment
I have a following environment:
Cassandra 2.1.0
5 nodes in one DC, 4 nodes in second DC
2500 writes per seconds
minimal reads (usually none, sometimes few)
Problem
After a few weeks of running I cannot read any data from my cluster,…
Piotr Stapp
- 19,392
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-1
votes
1 answer
Cassandra Clustering order not sorting list
I have a patient table and treatment_patient where pat_id acts as foreign key. I want to execute a query such that the treatment_patient always returns values ordered by pat_id.
I tried adding WITH CLUSTERING ORDER BY (patid ASC); at the end but…
VIshu Kamble
- 125
- 9
-2
votes
1 answer
How to achive Cassandra O'Reilly Architect Certification
About the Architect Certification aviable for version 2.x at O'Reilly, in what manner the questions on this certification varies from the other two available (Administrator and Developer) Do you suggest some additional material to study for this…
Cristian
- 19
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1 answer
looking for examples/samples using Spark aggregate and group by in Cassandra
I want to run the following query using Spark Python (pull data from Cassandra) similar to Oracle SQL:
select name, value, count(*) from table_name order by name, value
group by name....
any examples/samples will help, thanks!
SBC
- 125
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1 answer
Cassandra using Ansible
I am new to ansible and trying to deploy cassandra using ansible.
So far I was able to set up a 3 node cassandra cluster and start up cassandra services, but I want the errors/warnings in cassandra logs to be printed on console.
Is there any module…
Ankitha Sathya
- 23
- 5
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1 answer
Cassandra data model design approach
I am new Cassandra. please help me to understand how to define best data model in Cassandra.
Model 1:
CREATE TABLE users (
id uuid PRIMARY KEY,
username text,
email text,
age int
)
CREATE TABLE users_by_username (
username text…
Gnana
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