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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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Datastax Cassandra Driver Asynchronous ResultSet Fetching Does Not Work

I want to load larget row of data, so my plan is divide the statement to parts, divided by timestamp, and than run it asynchronously. ... // List to save ResultSets List> pending = new ArrayList<>(); for(Range…
panoet
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Cassandra Ordering Query (or Auto Update Record) Without Primary Key

I have cassandra table containing information about ship identities. It has column: imo_number, mmsi_number, ship_name, timestamp. I have 2 requirement for this table: I want this table to only save row with last updated records, according to…
panoet
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Load Large Amount of Row In Cassandara / Datastax

I have a table that has about 3 millions row in 1 partition key. I need to load all those data and save it as file. Actually it is data recorded for 1 day sensor input. And what I want to build is a playback service to replay the sensor event at…
panoet
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Cassandra read after write inconsistency with LOCAL_QUORUM

We are running a cassandra cluster with a local data-center of 3 nodes and (I believe) a replication factor of 3. A remote data-center exist, but isn't used in our queries. We use Java libraries, more precisely : org.apache.cassandra:cassandra-all…
Azzip
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Spark Cassandra optimized join

I want to optimize RDD join with Cassandra via Spark. I am trying to read a data, and join with Cassandra data. I was trying to use datastax cassandra connector for this. But it is giving me an error -- Invalid row size: 6 instead of 4. Here are…
CSUNNY
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How to check != null in Cassandra using datastax DevCenter?

I've tried different cases: where ip != NULL where ip <> NULL where ip IS NOT NULL but it doesn't work :(
Nikolas
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Is there a way to know how long a compaction run in cassandra?

I was able to get ETA on the compaction operations running now by using nodetool compactionstats. But what I need is to know how long did the past compactions run. nodtool compactionhistory shows when the compactions are completed but time took by…
psp
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Unable to launch cqlsh in datastax Cassandra distribution

I have donwloaded ddac-5.1.17, and can successfully launch cassandra server. But on executing 'cqlsh' command from command line in Windows 10, I get strange error: \ddac-5.1.17\bin>cqlsh File "....\ddac-5.1.17\bin\cqlsh.py", line 152 except…
Mandroid
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Datastax Kafka Connector Unable To Parse Json Topic

I have a producer class sends to a topic using custom JsonSerializer from Github public class JsonSerializer implements Serializer { ... @Override public byte[] serialize(String topic, T data) { try { return…
panoet
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Cassandra (DSE) - Need suggestion on using PER PARTITION LIMIT on huge data

I have a table with around 4M of partitions and each partition contains 4 rows. So, the total data in table would be having 16M rows (wide columns). Since our table is a time series database, we only need the latest row or version of the…
Prathap
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Not marking nodes down due to local pause of 8478595263 > 5000000000

i have 3 node cassandra cluster in kubernetes. Deployed cassandra using bitnami/cassandra helm chart. getting error based on more number of request after sometime later WARN [GossipTasks:1] 2020-01-09 11:39:33,070 FailureDetector.java:278 - Not…
devopsdymyr
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Need Help starting DSE Graph

When I type in the following command "dse gremlin-console" the system tries to start but then i get the following error: Exception in thread "main" java.awt.AWTError: Asssitive Technology not found: org.GNOME.Accessibility.AtkWrapper Do i need to…
Siguy12
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Simulate multiple users connection to Cassandra using java

I'm developing an application using java. The objective is to simulate multiple users connection to Cassandra (concurrent connections), all of them connected to same cluster. My questions is: Should I implement multiple sessions where each session…
Sholi
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Cassandra - error writing. How to solve it?

In our company, we do one project and use apache, Cassandra. Until recently, we used an older driver. Yesterday, we tried to replace it with the latest 4.3.0. We connect to the database, everything works as it should. The problem is when I try to…
Erik Juríček
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How to set read request timeout for cassandra

I try to create new endpoints for cassandra with different read request timeout. The endpoint with big timeout for requests with big data responds. I found Scala code with com.datastax.cassandra driver and cassandra-default.yaml with…
Vadim
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