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Questions tagged [cassandra-driver]

Apache Cassandra drivers for variety of programming languages

88 questions
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When connecting cassandra hosted on docker container with nodejs getting NoHostAvailableError: No host could be resolved

I set up the Cassandra container by running the following commands: This will pull the Cassandra docker image from the docker hub and start up a container with Cassandra docker network create cassandra-net docker run --name my-cassandra --network…
Goldi Pandey
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Cassandra 3.x to 4.x driver differences

Can anyone tell me how to replication this old annotation from the Datastax 3.x series of drivers to the new 4.x series: @Table( name = "mytable", readConsistency = "LOCAL_ONE", writeConsistency = "LOCAL_QUORUM") I got the…
Jason Nethercott
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Unable to insert nested json into cassandra

I am new in Cassandra. I have created one sample table. Right now facing problem during insert. created employee like below : create table employee( emp_id int PRIMARY KEY, first_name text, last_name text, department text, skillswithrank…
sameer vedpathak
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Syntax error in CQL query when trying to write to cassandra from python

So, I am building an application in python that takes data from twitter and then saves it to cassandra. My current problems lies in a script which reads data from kafka and tries to write it to cassandra, as follows: import threading, logging,…
JOSE MANUEL RAMIREZ LEON
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Cassandra python driver - frozen with Object Mapper

I'm trying to declare and create (using sync_table) Cassandra table using a Object Mapper from python Cassandra driver (cassandra-driver package version 3.14), but I can't find a way to define a frozen value in a collection. Is there a way to…
iborko
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Python cassandra driver Readtimeout

Every time I try to get query using the cassandra python driver, I will receive such an exception: **File "something.py", line 32, in rows = session.execute('some query execution', timeout=None) File…
Andy Chang
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Querying cassandra database with an array

I am trying to query my cassandra database to return data from a list of names held on an array server side. This is held as an array. I know the data I am accessing is stored as a string in my database and so I have appended single quotes around it…
Joseph Clough
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Issue when closing cassandra cluster and session

Cassandra 2.1.15.1403 | DSE 4.8.9 Cassandra driver tested with: 2.1.2 and 3.1.7 We are using a python script to migrate some data in one of our tables. Once this is done we are closing off the connections using: if (None != self.session): …
Sid
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Remove newline characters from Cassandra query results

I am using the python Cassandra driver to query a database. This is the code that I ran: from cassandra.cluster import Cluster from cassandra.query import dict_factory ips = [...] cluster = Cluster(ips) session =…
pajamas
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Can anyone explain what a page state is on Cassandra?

I am trying to implement paginated REST API backed by Cassandra. I found that the Cassandra driver has a pagination feature (http://docs.datastax.com/en/developer/java-driver/3.3/manual/paging/). I did a simple experiment with this feature, and it…
Wei
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Can't connect DataStax AstraDB with Django app on Google Cloud

I am trying to connect AstraDB with my application served by gcloud AppEngine. I am using Django and therefore have used django_cassandra_engine. I want to keep Postgres as my default DB and use cassandra as a second DB. Everything works as expected…
Marat M
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Cassandra long connection times (compared to Redis)

I'm surprised by Cassandra long connection times (compared to Redis) made from the python client (cassandra-driver) to a single-node Cassandra cluster running on the same host. How can they be improved? More info Even though Cassandra server runs…
mirekphd
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How do I setup dropwizard metrics for the Cassandra java driver?

I would like to set up the java driver to collect JMX metrics using jConsole or jmxterm. How do I go about exposing those mbean metrics in the Cassandra java driver? In this case, I'm using the 4.14 java driver.
stevenlacerda
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Why cassandra python query result replaces column name's space with underscore?

I am using cassandra python driver. Version details : [cassandra-driver (3.25.0)] [cqlsh 6.8.0 | Cassandra 4.0.4 | CQL spec 3.4.5 | Native protocol v4] I am querying Cassandra database where I have created few columns which have empty space and…
sandejai
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Why keyspace metadata is null only when connecting to datastax enterprise 6.8 with cassandra-driver?

We have a requirement to support Datastax Enterprise 6.8.Installed DSE6.8 on aws ec2 linux by referring https://docs.datastax.com/en/install/6.8/install/dseBasicInstall.html. Our code does support Apache cassandra,drivers we use are…
prathyusha magam
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