The WSO2 Elastic Load Balancer (ELB) 2.0.3 Release - 28th January 2013!

The WSO2 ELB team is pleased to announce the release of version 2.0.3 of the Open Source Elastic Load Balancer (ELB).

WSO2 ELB is a fast, lightweight and user friendly open source Elastic Load Balancer (ELB) distributed under the Apache Software License v2.0. WSO2 ELB allows system administrators and developers to easily configure fail over routing, load balancing, service aware load balancing, tenant aware load balancing and dynamic load balancing with auto scaling.The ELB runtime is designed to be completely asynchronous, non-blocking and streaming based on the Apache Synapse mediation engine.

WSO2 ELB 2.0.3 is developed on top of the revolutionary WSO2 Carbon platform (Middleware a' la carte), an OSGi based framework that provides seamless modularity to your SOA via componentization. This release also contains many new features and a range of optional components (add-ons) that can be installed to customize the behavior of the ELB. Further, any existing features of the ELB which are not required to your environment can be easily removed using the underlying provisioning framework of Carbon. In brief, WSO2 ELB can be fully customized and tailored to meet your exact SOA needs.

You can download this distribution from http://wso2.com/products/elastic-load-balancer/ our product page and give it a try.

How to Run

1. Extract the downloaded zip
2. Go to the bin directory in the extracted folder
3. Run the wso2server.sh or wso2server.bat as appropriate
4. Configure the load balancer to manage the load across the instances to be balanced.
5. If you need to start the OSGi console with the server use the property -DosgiConsole when starting the server. The INSTALL.txt file found on the installation directory will give you a comprehensive set of options and properties that can be passed into the startup script

Key Features of WSO2 ELB

• Non-blocking HTTP/S transports based on Apache HttpCore-NIO for ultra-fast execution and support for thousands of connections at high concurrency with constant memory usage. Integrated high performing, Passthrough Transport.
• Load-balancing (with or without sticky sessions)/Fail-over, and clustered Throttling and Caching support
• Lightweight, XML and Web services centric messaging model
• NEW! Automatically scaling the system according to the number of requests in-flight for a particular service cluster - "Scale up early, scale down slowly"
• Service aware dynamic load balancing - A single load balancer can centrally manage the load across the nodes of different service clusters.
• Tenant aware load balancing - Tenants can be loaded and unloaded dynamically. Tenants can be partitioned to different service clusters.

Known Issues

All the open issues pertaining to WSO2 ELB 2.0.3 are reported at following locations:

• Open ELB issues

Release 2.0.3

Change Log: This release brings out the autoscaling support for ELB and also contains fixes for some critical issues.

1. LB-17 - SSO Enables deployment does not work with load balancer.
2. LB-31 - No response code in the access log.
3. LB-37 - Browser tries to save the page sent via LB time to time rather than display it.
4. LB-51 - Disable management console in LB and do not print mgmt console URL at startup.
5. LB-52 - When member leaves the cluster, session continued to bind to that cluster member.
6. LB-55 - Make autoscaling algorithm configurable.
7. LB-64 - Failover is broken in ELB.
8. LB-65 - If one member of a cluster is going off and during that time, the requests redirected to that member by the load balancer, will be failed with a timeout, until the load balancer gets updated that this member has left cluster.
9. LB-66 - Embed Cloud Controller Service aka Autoscaler Service into ELB.

How You Can Contribute

Mailing Lists

Join our mailing list and correspond with the developers directly.

• Developer List : dev@wso2.org | Subscribe | Mail Archive

Reporting Issues

We encourage you to report issues, documentation faults and feature requests regarding WSO2 ELB through the public ELB JIRA. You can use the Carbon JIRA to report any issues related to the Carbon base framework or associated Carbon components.

Discussion Forums

Alternatively, questions could be raised using StackOverflow website.

Support

We are committed to ensuring that your enterprise middleware deployment is completely supported from evaluation to production. Our unique approach ensures that all support leverages our open development methodology and is provided by the very same engineers who build the technology.

For more details and to take advantage of this unique opportunity please visit http://wso2.com/support.

-- The WSO2 ELB Team --