Quarkus suppot many database, SQL and NoSQL.
Cassandra have best performance on benchemark, much better when using "ScyllaDB", database based on Cassandra.
When will we have integration with Cassandra? I don´t have any information about. If need help, I would be proud to help.
There is a team at DataStax working on a Quarkus extension for Cassandra. If you are looking for something to get your hands on, see the GitHub repo below.
https://github.com/datastax/cassandra-quarkus
Related
I'm trying to use Apache Flink's Table concept in one of my projects to combine data from multiple sources in real-time. Unfortunately, all of my team members are Node.JS developers. So, I'm looking for possible ways to connect to Flink from NodeJS and query from it. In Flink's documentation for SQL Client, it's mentioned that
The SQL Client aims to provide an easy way of writing, debugging, and submitting table programs to a Flink cluster without a single line of Java or Scala code. The SQL Client CLI allows for retrieving and visualizing real-time results from the running distributed application on the command line.
Based on this, is there any way to connect to Flink's SQL client from NodeJS? Is there any driver already available for this like Node.JS drivers for MySQL or MSSQL. Otherwise, what are the possible ways of achieving this?
Any idea or clarity on achieving this would be greatly helpful and much appreciated.
There's currently not much that you can do. The SQL Client runs on local machines and connects to the cluster there. I think what will help you is the introduction of the Flink SQL Gateway, which is expected to be released with Flink 1.16. You can read more about that on https://cwiki.apache.org/confluence/display/FLINK/FLIP-91%3A+Support+SQL+Gateway
Another alternative is to check out some of the products that offer a FlinkSQL editor on the market, maybe that is useful path for your colleagues.
For example:
https://www.ververica.com/apache-flink-sql-on-ververica-platform
https://docs.cloudera.com/csa/1.7.0/ssb-overview/topics/csa-ssb-intro.html
Note that this is not exactly what you asked for, but could be an option to enable your team.
I need to implement database migration scenario for a gradle and sbt application which uses cassandra.
if there is no any other way we can use flyway with cassandra, please suggest another tool which helps in maintaining versioning.
This looks tricky. A couple of alternative tools, inspired by Flyway, are mentioned in that issue that you could assess:
https://github.com/patka/cassandra-migration
https://github.com/Contrast-Security-OSS/cassandra-migration
I can't set up Hector for Cassandra. I've looked through the documentation and the Cassandra wiki. The problem with these docs is that a lot of the information there is outdated, or minimalistic (or I'm lacking knowledge). Anyway, I'm wondering if anyone can provide some rough simplistic guide as to how to go about installing it.
I'm aiming to build a JSP page that can use the Cassandra database.
What I've done so far:
I've downloaded Hector 1.0-2 and Cassandra 1.0.7.
I've set up Cassandra and checked it works (used CLI to create new columns using keys)
Tried unpacking the me.prettyprint.cassandra into the Java project directory but still nothing.
I'm also not sure where to get the thrift API (or how to install it)? And, if i need it at all?
Any help would be appreciated.
As I remember, it was very easy to install Cassandra, and get Hector to work for a basic insert, retrieve example. It's like
Install Cassandra
Create keyspace, and column families from Cassandra CLI.
Create a plain Java Maven project, and add Hector, and Thrift dependencies to it. (Maven is not necessary, I just meant a simple hello-world project here.)
Write insert code, then check into Cassandra using CLI.
Write retrieve query, then see if matches, and slices properly.
But that was Cassandra 0.6.0. Not sure what so hard.
Please look into this tutorial, and you can also see this simple source code for insertion.
If you land into some trouble come with specific problem, it will be much easier that way.
Hope this helps.
Closed. This question needs to be more focused. It is not currently accepting answers.
Want to improve this question? Update the question so it focuses on one problem only by editing this post.
Closed 8 years ago.
Improve this question
I am trying to develop application using Hive as the Database, and then I also find noSQL solutions as an alternative to it.
Now decided to develop using Cassandra, my next problem is about what client should I use? which one is better, Hector -- a pure java solutions, or Kundera with JPA like development?
I prefer Hector, but I am curious about Kundera. Is there anyone using Kundera? Which is better?
I'm curious about CQL (Cassandra Query Language). Can it integrate with Hector?
Hector is slowly moving towards CQL integration. The first steps have been made, but because of the experience of an unstable API, the developers seem to have postponed a new release. The CQL API is rather new, as it should be nearly equivalent to a SQL syntax. I made some basic steps with CRUD operations to verify that data could be written and read via CQL.
Nevertheless, the CQL JAR is not usable out of the box like a standard JDBC driver as of now, and misses some important feature aspects. Having a look at the more or less difficult to understand thrift API and the not really much simpler hector API, I am convinced that CQL will be established as the state-of-the-art access API for Cassandra in version 0.8.1 and 1.0, where thrift will remain the native, raw access for some time.
The competition between both APIs has nothing to do with the decision of Hector. Hector itself provides additional services like failure and connection handling in the cluster. These are features being addressed by neither thrift nor CQL.
I don't really believe in all other O/R mappers, or even those claiming to provide a full-fledged JPA. I cannot imagine how this should work.
Answering your question about clients - Hector essentially provides access to the Cassandra native API (columns, column families, rows etc) whereas Kundera aims to hide these details and provide object-database mapping.
Kundera therefore probably makes it easier to quickly persist a range of Java objects into Cassandra - but may not provide an efficient mapping, perhaps losing some of the performance that noSQL approaches provide.
Hector expects you to adapt to the Cassandra data model - this will be harder work, but is likely to deliver more performance.
There is now a new client, Astyanax, released by Netflix in January 2012.
"Astyanax is a Java Cassandra client. It borrows many concepts from
Hector but diverges in the connection pool implementation as well as
the client API. One of the main design considerations was to provide a
clean abstraction between the connection pool and Cassandra API so
that each may be customized and improved separately. Astyanax provides
a fluent style API which guides the caller to narrow the query from
key to column as well as providing queries for more complex use cases
that we have encountered. The operational benefits of Astyanax over
Hector include lower latency, reduced latency variance, and better
error handling."
The source code for Astyanax is hosted at Github: https://github.com/Netflix/astyanax
For details about using CQL with Cassandra and Hector, see:
https://github.com/rantav/hector/wiki/Using-CQL
The following mail list thread is a good discussion on where we will be going with CQL as an API:
http://groups.google.com/group/hector-users/browse_thread/thread/540dc9c3908fbb44/f5ee488f2178e2f4
For the sake of completeness I think the Pelops library should be mentioned too. Hector seems to be the most used, but Pelops has a simpler API. Pelops does not support CQL.
Coming from Ruby I find both to be extremely verbose and imperative, though.
Kundera no more relies on Solandra for indexing approach. It enables you now to use secondary indexing support provided by Cassandra and as well as it gives you a way to run jpa queries over OPP (like range queries etc). We are working to enable native CQL support.
Take a look at:
http://mevivs.wordpress.com/2012/02/13/how-to-crud-and-jpa-association-handling-using-kundera/
for more details.
-Vivek
There is no java client in the same level with hector, hector is the best and there is work in progress in hector side to support cql. I saw cql commits for hector in github this month, but doesn't know it's final state. You can ask it to hector users group http://groups.google.com/group/hector-users
Also there is a very simple object mapper in hector
https://github.com/rantav/hector/wiki/Hector-Object-Mapper-%28HOM%29
My Best,
Serdar Irmak
Kundera 2.0.4 released:
Major Changes in this release:
Cross-datastore persistence( Easy to migerate existing mysql app over nosql)
support for relational databases (e.g Mysql etc)
replace solandra with lucene based indexing.
Support added for bi-directinal associations.
Performance improvement fixes.
We tested and 1 million inserts with proper indexing happened in 6 minutes.
Vivek
I am yet to try Hector, but am involved in latest Kundera 2.0.1 release. I suggest you give it a try. It has gone a major change since its inception and you can see a lot of new features getting added and bugs being fixed. Currently it supports JPA 1.0 and Cassandra 0.7.6 but we are planning to add support for Cassandra 0.8 and JPA 2.0 very soon. There is a pretty good example here: https://github.com/impetus-opensource/Kundera/wiki/Getting-started that may help you get started.
Astyanax api produces human-readable code and does include connection pooling.
CQL support over cassandra has been integrated in kundera 2.0.6(yet to be released). It allows to execute CQL as nativequery now.
-Vivek
I am developing a site using following technologies,
Ruby on Rails,(ruby 1.8.7,rails 2.3.5)
Cassandra 0.6.8,
I want to index the Cassandra Database using Lucandra,
How do I do this?
Is there any RESTful APIs or any web services available for this, so
that I can push the data to index database?
Please share if any ROR example using Lucandra, that really help us to
move forward.
Or Guide me some steps to achieve this.
I am googling for 3 days and I am not getting any examples using
Lucandra in ROR.
Your help will be appreciated in advance
The Solandra project which is replacing Lucandra no longer uses
thrift, only Solr. http://github.com/tjake/Lucandra
This means you can use any of the Solr supported gems like
acts_as_solr
I'm recommending elasticsearch. It has rest api, ruby & rails clients.
https://github.com/angelf/escargot
https://github.com/grantr/rubberband
Elasticsearch is the most advanced free search solution in the world today. It's based on lucene, has High Availability, fault tolerant, partitioned, high performance, scalable, state of art technologhy , open source, more simple than solr... It's success belongs to it's author Shay Banon. He has years of experience as an architect in this field. Solr (and solandra) is nowhere near of it. Simply investigate both, you'll see yourself.
my best
Serdar