|
Sponsored Links
Resources
Enterprise Java
Research Library
Get Java white papers, product information, case studies and webcasts
|
News
News
News
|
Messages: 10
Messages: 10
Messages: 10
Printer friendly
Printer friendly
Printer friendly
Post reply
Post reply
Post reply
XML
XML
XML
|
 |
ObjectWeb releases C-JDBC 1.2, database clustering middleware
ObjectWeb has announced the release of C-JDBC 1.2, their open source database clustering middleware. The new release includes support for Updatable ResultSets, new pass-through schedulers for increased performance as well as many other improvements and fixes.
To use C-JDBC, databases are replicated to a set of servers, and C-JDBC is configured to know each element in this database "cluster." Reads passed through C-JDBC are then load-balanced across each node, with writes being broadcast to each node to maintain synchronicity.
Among other changes, the 1.2 release supports Updatable ResultSets. New pass-through schedulers have been added for all RAIDb levels for increased performance. The DatabaseMetaData code has been refactored to provide more transparency with regard to the underlying database engine. A number of other contributions have helped in various area for developer documentation, code cleaning and bug fixes.
This project enables a middleware component to replicate many features of a database cluster, which might be very useful if a formal DBA isn't available or the database product being used doesn't support clustering.
What do you think?
|
|
|
Message #164139
Post reply
Post reply
Post reply
Go to top
Go to top
Go to top
|
|
ObjectWeb releases C-JDBC 1.2, database clustering middleware
anyone using this in the field yet? in the comments on TSS after the last release, there seemed to be people interested in trying it out, have any of them tried it in a production environment yet?
|
|
|
Message #164169
Post reply
Post reply
Post reply
Go to top
Go to top
Go to top
|
|
ObjectWeb releases C-JDBC 1.2, database clustering middleware
Sounds interesting, do they have support for jdbc 3 or does it plug to existing driver or has it's own api
|
|
|
Message #164219
Post reply
Post reply
Post reply
Go to top
Go to top
Go to top
|
|
ObjectWeb releases C-JDBC 1.2, database clustering middleware
This is really cool stuff! I am just wondering like others, could someone who used this before shared his experiences with the TSS community?
thx
rgds
tmjee
|
|
|
Message #164252
Post reply
Post reply
Post reply
Go to top
Go to top
Go to top
|
|
I' using it
Is not a winderfull software, have problems with fail over and syncronization. When a database goes off we must go their and do a cople os things to restore de database :(
with postgres i must do pg_dump from the god database (the one do not goes off), and restore this dump in the other database. :(
This cold be done automacticly, when c-jdbc do this they come a nice software.
Now is a god software to have fail over in the databeses with a low budget.
C-JDBC and heartBeat(piranha) together is a good solution :) for small projects
|
|
|
Message #164260
Post reply
Post reply
Post reply
Go to top
Go to top
Go to top
|
|
ObjectWeb releases C-JDBC 1.2, database clustering middleware
Sounds interesting, do they have support for jdbc 3 or does it plug to existing driver or has it's own api
You can consider C-JDBC as a smart JDBC proxy and therefore we support the same set of features as your database driver does (if your driver does not support JDBC 3, we don't either).
However we do not support yet JDBC 3 savepoints. You can check the documentation for a detailed list of limitations.
Emmanuel
|
|
|
Message #164261
Post reply
Post reply
Post reply
Go to top
Go to top
Go to top
|
|
ObjectWeb releases C-JDBC 1.2, database clustering middleware
This is really cool stuff! I am just wondering like others, could someone who used this before shared his experiences with the TSS community?thxrgdstmjee
As C-JDBC was not backed yet by any company, it is really hard to get feedback on real usage and C-JDBC is mostly raw technology. We will try to change that with Emic Networks, the company I just joined.
There is an interesting thread on Javalobby that discussed the results of the C-JDBC survey. I think that Andy DePue's response is insightful.
Emmanuel
|
|
|
Message #164268
Post reply
Post reply
Post reply
Go to top
Go to top
Go to top
|
|
ObjectWeb releases C-JDBC 1.2, database clustering middleware
Anyone know some success stories about the use of C-JDBC product?
Should be available a good presentation I've seen at the the last ApacheCon 2004 in LasVegas...
bye,
Luca Garulli
www.Pro-Netics.com (member of Orixo.com - The XML business alliance)
OrienTechnologies.com - Light ODBMS, All in one JDO solution
|
|
|
Message #164271
Post reply
Post reply
Post reply
Go to top
Go to top
Go to top
|
|
ObjectWeb releases C-JDBC 1.2, database clustering middleware
I was also interested and I tryed it 3 month ago. I make one simple example where I was running simple inserts against 2 databases. However c-jdbc doesn't work as expected. Some rows was lost in one database. I couldn't imagine use it in this state in real production environment event in middle scale projects.
Also administration interface is far from error prone. It doesn't warn you when you are doing strange operations.
|
|
|
Message #164275
Post reply
Post reply
Post reply
Go to top
Go to top
Go to top
|
|
ObjectWeb releases C-JDBC 1.2, database clustering middleware
However c-jdbc doesn't work as expected. Some rows was lost in one database.
Did you report that on the mailing list? I would be surprised that this would not have been addressed if it was reported. If users don't provide feedback, a project cannot improve.
Also administration interface is far from error prone. It doesn't warn you when you are doing strange operations.
Yes, this is true. The admin interface is very open so that you can have fine grain control on the C-JDBC controller. However, you have to be careful on what you do else you can break everything very easily. We are trying to refine these functionalities to restrict what is available from the admin console. Most of the problems raised are due to a misuse of the technology but our documentation is not that great so the users are not to blame here.
Don't hesitate to share your feedback (positive or negative) on the c-jdbc@objectweb.org mailing list, it helps us improve the quality of the technology.
Emmanuel
|
|
|
Message #164539
Post reply
Post reply
Post reply
Go to top
Go to top
Go to top
|
|
Doesn't work yet
anyone using this in the field yet? in the comments on TSS after the last release, there seemed to be people interested in trying it out, have any of them tried it in a production environment yet?
I tried to get JDBC running (the previous release, as well as a couple before that). The DB I use is PosgreSQL 7.4 on Linux. To test how stable the system is, I tried to disable one DB node from the cluster, and later tried to enable it again. At a first glance this actually seems to work, but the devil is in the details. It doesn't work under load!
If you're doing inserts to your DB cluster (at a higher rate than +- 1 per second), then it simply doesn't work anymore. When enabling the previously disabled node I'm getting a duplicate row SQL error.
So, the conclusion must be that either I'm doing something completely wrong (although I tried with a very simple test case and followed the instructions step by step), or that JDBC is simply not ready for production yet.
Although this naturally can't be changed anymore, I assume it would have been better as ObjectWeb had more accurately reflected the state of its software in the version number. Although CJDBC looks *very* promissing and the developper seems to be very motivated and skilleed, maybe calling it version 1.2 is too optimistic and something like 0.6 orso would have actually been better.
|
|
|
| New content on TheServerSide.comNew content on TheServerSide.comNew content on TheServerSide.com |
|
|
Reza Rahman explores the features of the proposed JSR 299, Contexts and Dependency Injection for Java EE (CDI). When approved, it promises to be a key feature of Java EE 6.
(November 2, Article)
SAML is an XML-based standard for exchanging authentication and authorization data between security domains. The single most important problem that SAML was created to solve is the Web browser Single Sign-On problem. Many organizations are debating whether to stay with version 1.1 or move to 2.0. This article makes observations about both options.
(September 28, Article)
Joe Ottinger takes a look at how people learn, and applies it to the practice of programming. He notes that understanding how people learn is an essential part of working in a programming team.
(September 22, Article)
Stephen Maryka gave us an article about the Asynchronous Web and posed a number of questions that get examined like an approach to delivering Asynchronous Web capabilities through extensions to existing Java EE technologies.
(July 14, Article)
JavaServer Faces Flex goal is to provide users capability in creating standard Flex components, part of flexSDK which is open sourced through MPL license, as normal JSF components. This article by Ji Hoon Kim will provide an overview of creating a simple multilingual JSF page consisting of JSF Flex tags.
(June 29, Article)
In this session Jeff explores the key characteristics of successful SOA projects. He covers some of the patterns, and anti-patterns, tool sets, and strategies that he himself learned the hard way. Last, he provides a strategy and blueprint for achieving a high likelihood of success in your SOA project.
(June 23, Tech Talk)
Ari Zilka, CTO of Terracotta, Inc., talks about the new features in Terracotta 3.1, announced during JavaOne and available now.
(June 15, Tech Talk)
In this Tech Talk, Josh Long explores an integration challenge using Spring Integration and walks through the implementation, employing and expanding on the basic patterns of Enterprise Application Integration to tie together components into a function integration solution, and then demonstrates how Spring Integration helps address the integration requirements.
(June 15, Tech Talk)
In this Tech Talk, David Geary teaches you: The basics of Google Web Toolkit; How to implement Ajax-enabled applications in Java; Internationalization; Hooking into the browser history mechanism; Remote procedure calls.
(June 4, Tech Talk)
Jon Kern discusses the best architecture/technical solutions and ensure that they are repeated by all developers. By tackling the architecture up-front in a serial manner, subsequent parallel development will be much more manageable and predictable.
(May 28, Tech Talk)
This keynote describes the frustrations of modern knowledge workers in their quest to actually get some work done, and solutions for how to guard yourself against all those distractions. Neal Ford talks about environments, coding, acceleration, automation, and avoiding repetition as ways to defeat the misguided attempts to sap your ability to produce good work.
(May 26, Tech Talk)
Gil demonstrates how new, aggressive uses of already abundant compute capacity by common applications offer competitive value for application designers.
(May 21, Tech Talk)
Chris Keene introduces WaveMaker as a new way to automate the ability to generate Hibernate classes in order to more quickly bring OR mapping into an application.
(May 19, Article)
In this session Nati Shalom demonstrates how to take a standard Java EE web application and scale it out or down dynamically without changes to the application code. Seeing as most web applications are over-provisioned to meet infrequent peak loads, this is a dramatic change because it enables growing your application as needed, when needed, without paying for unutilized resources.
(May 19, Tech Talk)
Mastering EJB was one of the original and most influential EJB books in the industry. Mastering EJB III now returns with two new expert co-authors, updated for EJB 2.1 and 30% new chapters including security, integration, best practices, open source, and more.
(Book PDF Download)
The Application Server Matrix is a detailed listing of J2EE vendors and their application server products, with information on latest version numbers, J2EE spec support and licensing, pricing, platform support, and links to product downloads and reviews.
(Application Server Comparison Matrix)
|
|
