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From "Kurt Roy" <>
Subject Can multiple processes download artifacts and access them from one Ivy local cache without failure?
Date Sun, 06 Jan 2008 21:10:19 GMT


We need to integrate some new software being built by Maven into our
main software being built with a homegrown, ant-based build system. 


We want to try pulling our Maven built artifacts into our main build
system by using the Ivy dependency manager (using Maven ant lib is
problematic in our environment, which I describe below). 


Our build environment:


Our automated build system runs all builds from one UNIX user id whose
home is on one shared drive. Every night, our build system can have up
to 4 or 5 builds running concurrently under this one user id on the same
or different machines (we are building about 20 different products every
night that share many reusable components).


My question is this: 


Can all these builds share the SAME default Ivy local cache stored in
the one UNIX user id's home directory? I assume for reads this is not a
problem. But what if two (or three) separate processes start downloading
the same artifact to the local repository at the same time? Is this


We originally were going to just use the Maven ant tasks to pull in our
new artifacts, but we found out that the Maven does not directly support
concurrent process accesses to the Maven local repository. The suggested
workarounds ranged from:


1.	using separate local repositories per product/version/build
(creates duplication of repository data and another thing to maintain)
2.	Use a local repository mirror (need to research how exactly this
will solve my problem), 
3.	Developing some sort of "locking" ant task to synchronize access
to the local repository (a new development task, needs to be done


Before exploring the alternatives above, I just wanted to see if Ivy has
the same problem - no support for concurrent access to the local cahce.
If not, we may use it as the integration point between our Maven built
software and our main software.


Thanks in advance,

Kurt Roy | PROS | Software Architect, Software Development
phone: +1 713-335-8007 | email: 

Save the Date for the 14th Annual PROS Summit * April 20-23, 2008 at the
Hilton Americas Hotel in Houston, Texas *


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