Applications that Use Spread
Spread has been used in a variety of open source and
commercial applications in addition to research
projects. Below is a list of some of these projects.
Please let us know
if you would like your project to be added to
this list.
Research Projects
Secure
Spread
The Secure Spread research project studies
the integration of security services with reliable group
communication.
Wackamole
Wackamole
is a high-availability virtual cluster support
application that manages virtual IP addresses and
guarantees that no matter what machines in the cluster
are working, all of the virtual IP addresses are covered
by exactly one machine. Wackamole also tries to balance
the number of virtual IP addresses handled by each
server. See also N-Way
Fail-Over Infrastructure for Reliable Servers and
Routers.
Oasis
A
distributed storage system for small scale clusters
implemented in-memory using a distributed shared memory.
A research project at UC Riverside. Papers about it can
be found here.
MEAD
Proactively
Reconfigurable, Adaptive, Reliable Middleware. A
software distribution and papers are available from the
website. A research project at CMU led by Priya
Narasimhan.
Applications
Replicated
Hash Table
A light-weight, feature-rich,
in-memory hash table data structure replicated on
multiple participating computer systems.
Secure
Spread
A commercially available high performance
multicast and group communication service that ensures
the confidentiality and integrity of messages, and is
resilient to faults across local area or wide area
networks.
Congruity
Replication
Multi-master (peer) replication,
supporting a range of application semantics. Provides
low latency and high throughput replication in
environments that may experience server crashes and
network partitions.
mod_log_spread
An
Apache module that provides reliable distributed logging
of a cluster of Apache webservers. A logging patch for
thttpd
is also available. This is currently used by sites as
large as 60+ machines to provide centralized logs of the
entire cluster, as well as multiple log copies for
redundency and auditablity reasons.
Splash
A
caching module for Apache-SSL that allows a cluster of
SSL enabled webservers to share the cache of active SSL
connections. This improves the performance of the
cluster by preventing renegotiation of keys when a
client changes which webserver it is connecting to.
Zope
Replication Services
The Zope Replication Service
increases the reliability and performance for all Zope
enterprise clusters by providing standby servers that
maintain redundant data storage and eliminate the
storage system as a single point of failure.
Spread
Management Tools
Several tools that make it
easier to manage a Spread network. One tool is a
liveness tester for the Spread daemon that can be used
with the Nagios/NetSaint NMS. A second tool is a small
program to count the number of messages sent to a Spread
group and plot a graph of the messages over time on a
web page.
Perl
Messaging:Courier library
A Perl Messaging API
that uses Spread as it's underlying messaging
implementation. It describes itself as providing
"asynchronous and synchronous access to a message
queue.".
User/Flooder
The
user and flooder programs are provided with the Spread
distribution. They provide demonstrations of the Spread
API, working test programs, and a simple performance
benchmark.
|