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Questions tagged [datastax]

DataStax Enterprise is big data platform consisting of open source tools such as Apache, Cassandra, Solr and Hadoop (and several others).

DataStax Astra simplifies cloud-native application development, and reduces time to deploy Apache Cassandra and scale from days to minutes. DataStax Astra eliminates the operational overhead of using Apache Cassandra, the open-source NoSQL database behind the largest applications in the world. Learn more on datastax.com/dev about new APIs for REST, schemaless document-style JSON, and GraphQL APIs for Cassandra - available with the Astra cloud service and stargate.io for standalone Cassandra.

For those who prefer self-managed technology, DataStax Enterprise (DSE) is a big data platform that provides a version of Cassandra enhanced with enterprise security features and that adds support for more workload types such as graph, search, and analytics. DataStax Enterprise enables companies to build transformational data architectures for applications, microservices and experiences that require data sovereignty, availability, scale, agility, and accessibility by any user.

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Getting the number of records read from Cassandra table while using Spark Cassandra Connector

While writing to Cassandra table, I get below information on number of rows written and time taken. From log, I can see it is coming from TableWriter class. How can I find same information while reading from Cassandra without calling an action on…
conetfun
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Cassandra/DataStax client is not returning UDT object from the keyspace

I have created UDT in Cassandra Employee UDT Corresponding c# class as below: public class Employee { public int emp_id { get; set; } public string emp_name { get; set; } public int emp_age { get; set; } } And following code to…
user3650484
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How to create search index with DSE search 6.8

I have been working with Datastax 6.7 for a couple of months now. Creating search index with the classic graph requires you create schema.xml and Solrconfig.xml through solr admin, which works fine. But when i upgraded to DSE 6.8, I need to create…
raktim bharatee
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Cassandra truncates milliseconds with LocalDate

I have been trying to store the timestamp value till millisecond in Cassandra but I am able to get only till LocalDate by DataStax driver, the millisecond part is being omitted by it. This is my class package com.example.connectCass.Model; import…
Alpit Anand
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Cassandra Database Datastax Coordinator node timed out?

I am receiving the following error. cassandra.ReadTimeOut: Error from server: code =1200 [Coordinator node timed out waiting for replica nodes' responses] message = Operation timed out - received only 0 responses." info={consistency:…
No No
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Trying to create a keyspace on cassandra with datastax python driver

I have this weird error i can't seem to get around, the python error is something i cant seem to figure out, unresolvable contact point sounds like ip issue? cluster-ip is none when i look at the client below NAME↑ …
dedpo
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Can't start Cassandra 3.11.6 service after restart the ubuntu 16.04 machine

I have Cassandra 3.11.6 in my ubuntu 16.04. Once I install Cassandra at use at fist time it is works fine. But I restart my machine then try to connect it shows error like this: Connection error: ('Unable to connect to any servers', {'127.0.0.1':…
RamS
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Cassandra List not getting deserialized using datastax java driver 4.0.0

I am currently working on a new project and chose Cassandra as our data store. I have a use case where I store prices for material and to accomplish it I created list of User-Defined Types (UDTs). But unfortunately, while deserialization using…
VIKRAM SINGH CHOUHAN
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Cassandra update process clarify

When we execute a read query it will retrieve data from SStable if it is true. then, What will happen if I retrieve the last updated data before compaction happens? in other words what Cassandra does to retrieve data which in memtable but not in…
RamS
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Achieve Mysql or Psql relational table (Foreign key constraint) feature in Apache Cassandra

Please help. I want to know how to query like Mysql relational tables (which mapped to another table by using foreign key constraint) select query or other queries in Apache Cassandra? Is there is any way to achieve a foreign key constraint feature…
RamS
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Fetch distinct field values from frozen set column in Cassandra columnfamily

Hi please help me to get cql query for below requirement - Column family contains columns: deptid (datatype:uuid emplList (datatype: set frozen(employee) ) How would I get all distinct employees name from employee object where it is stored at set as…
nagampalli suman
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OpsCenter default native client connection and load distribution?

If we have 8 nodes in a OpsCenter cluster(Primary and Secondary) with 2 DCs. We have almost 30 nodes connected to this OpsCenter for monitoring through datastax agent. My question is all 30 nodes will make almost equal connection and load…
LetsNoSQL
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Unable to install Cassandra cluster from Lifecycle Manager

I am trying to install a cassandra cluster using Lifecycle Manager, but I have this error : Meld execution failed: Failure to install Java: Could not determine if java installation is necessary. Java must either be installed as a pre-requisite, or…
mehmetozer
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Spark RDD join with Cassandra Table

I am joining Spark RDD with Cassandra table (lookup) but not able to understand a few things. Will spark pull all records between range_start and range_end from Cassandra table and then join it with RDD in spark memory or it will push down all…
conetfun
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Datastax Cassandra SSL Connection from Java error NoHostAvailableException

I have read and tried many given solutions to this question but it still does not work for me. I get the following exception: Exception in thread "main" com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed…
Daphne
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