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Questions tagged [pelops]

A Java client library for accessing the Apache Cassandra database

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Retrieve objects of sub-relation Cassandra with Kundera (Pelops - JPA)

We are getting a null object while retrieving data from Cassandra using JPA annotation OneToOne/OneToMany (see example below, where "item" is null). [ { "idProduct":"095102f1-a987-4f7c-88c3-153d80b6977f", "item":{ …
Mateus Leonardi
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Get specified columns data from Cassandra database not all the columns data

I am working with Cassandra database. I have created one column family which has 10 columns in that. Now I am interested in retrieving only the columns that I required. I don't need to retrieve all the columns value from the Cassandra…
arsenal
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Cassandra: copy entire row

Is there a recommended way, using a Java client, to copy / clone a row in a Cassandra column family? I'm currently using Hector (1.0-2) with Cassandra 1.1.8 but switching to another client library shouldn't be a problem.
Andrea
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Using operator 'or' in Cassandra IndexExpression

I have an Java application with Cassandra db. I'm using Cassandra Pelops. I have a columnFamily cf1, and a lot of columns there. For some of them I created secondary index, so I can use them for search. For search purpose, I created a list of…
Djordje Ivanovic
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Maven + Scala + Java + Pelops = trouble

I've a project in Java and Scala and I use maven to compile it. A Java class uses Pelops to access a Cassandra database and it is all fine (maven compile the entire project), but when I try to access Cassandra from a Scala object (using tha same…
dacanalr
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cassandra pelops weak performance on server than local

m using pelops to talk to cassandra and m wondering with its slower performance on server than local when m trying to insert the 1 GB of data .I m trying a bulk insert that is m creating a batch in mutator.writecolumn of around 2000 columns and…
samarth
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How can I have 40 connections per node to Cassandra database using Pelops client?

By default Pelops will have 20 connections per node- I was thinking to modify that to have around 40 connections per node. So how can I do that in Pelops? Currently, I am creating pool like this- private void createPool() { …
arsenal
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Two Cluster each with 12 nodes- Cassandra database

I have started working on a project in which I am using Cassandra database. Our production DBA's have setup two cluster and each cluster will have 12 nodes. I will be using Pelops client to read the data from Cassandra database. Now I am thinking…
arsenal
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Pelops Java Client to insert into Cassandra Database

I recently started working with Cassandra database. I was able to setup single node cluster in my local machine. And now I was thinking to start writing some sample data to Cassandra Database using Pelops client. Below is the keyspace and column…
arsenal
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cassandra client hector api java.lang.NoClassDefFoundError: org/apache/log4/Level

I am getting java.lang.NoClassDefFoundError: org/apache/log4/Level. I'm not a java guy but can read code. What should i do to get rid of this exception? This exception really have nothing to do with cassandra hector api, why is it bothering…
user836087
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Does Pelops and Hector support IPv6?

I am using pelops to retrieve data from cassandra cluster which has all its servers running on IPv6. While running this program getting following error. Exception in thread "main" java.lang.RuntimeException: exception while checking if MBean is…
samarth
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Reading the data from Pelops client and benchmark the read operation

I am trying to read the data from Cassandra database using Pelops client. I am successfully able to do that. Now I have started doing benchmarking, meaning how much time read takes from Cassandra database. So I have added my benchmarking code in…
arsenal
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