2012/10/11 Ron Wheeler <rwhee...@artifact-software.com>: > On 11/10/2012 1:40 AM, Wang, Simon wrote: >> Hi, Barrie, >> That's really helpful! >> >> Even I have local cache, it also takes about 2 mins to resolve >> dependencies. > What is it doing during this time. Run maven with a detailed log to see > each step. > > You might want to break your project up into modules that are smaller > and have fewer dependencies in each one. > >> Also it seems maven still will talk with remote maven server even I have >> local cache. > It will talk to your Nexus and you need to make sure that your POMs or > settings.xml do not refer to any other Maven Repo besides your Nexus. >> Yes, maybe it's caused by unspecified version numbers for dependencies. >> > Specify your versions on all dependencies >> I'll try maven-enforcer-plugin. > Not sure how this will help with performance. >> >> We're using nexus now, haven't tried MRM, I'll host it and compare it to >> nexus. > Nexus is an MRM.
Various Maven Repository Managers are listed here: http://maven.apache.org/repository-management.html Feel free to test all. As we are on maven users mailing list, I won't give you my preference (as it's usually good on such context to be fair ! and let user made their own experience on the topic). >> >> And I saw aether(major in dependency resolving) will take longer time to >> resolve conflict dependencies. >> Is it also a point that need to be improved? >> Do you know is there any maven plugin to identify conflict dependencies? > > The Eclipse IDE will do this with the m2 Eclipse plug-in. We use STS > which is Eclipse fully loaded with everything that you need to use Maven. > > This is not likely going to cause a big performance hit. >> Regards >> Simon >> >> -----Original Message----- >> From: Barrie Treloar [mailto:baerr...@gmail.com] >> Sent: 2012年10月11日 11:48 >> To: Maven Users List >> Subject: Re: How to optimize maven dependencies to get better performance? >> >> On Thu, Oct 11, 2012 at 1:46 PM, Wang, Simon <yunfeng.w...@ebay.com> wrote: >>> Hi, >>> We're in trouble of terrible performance on resolve maven dependencies. >>> I did some search about it. Basically below ways should be helpful: >>> >>> 1. optimize nexus server to improve response time. >>> 2. optimize maven dependencies. >>> 1) avoid duplicated dependencies >>> 2) avoid dependency conflict cases >>> 3).... >>> >>> Any others suggestions? >> What specifically is your problem? >> >> I can only guess at what you mean. >> I'm assuming that when you run "mvn install" that maven is reaching out to >> check for new dependencies which can be time consuming, especially with an >> empty ~/.m2/repository local cache. >> After the first install this shouldn't be a problem. >> >> Firstly make sure that you do not define additional "repository" in either >> your settings.xml or pom.xml. >> Every dependency will be checked against all repositories defined. >> So just by defining one extra repository will double the time it takes to >> check dependencies. >> There is no logic in Maven to blacklist/whitelist what artifacts are located >> where, this is one reason why you use a Repository Manager. >> You can see that if you declare repositories in your pom.xml and this is >> published how it will affect everyone that includes your artifacts. >> Please don't do that. >> >> Secondly, make sure you lock down all version numbers of dependencies. >> It is bad practice to not specify these as it makes your build >> non-reproducable. >> This could also be a reason why it is slow as Maven will need to check >> periodically to see if new versions are available. >> You can use maven enforcer >> (http://maven.apache.org/plugins/maven-enforcer-plugin/) to ensure that you >> have no unversioned artifacts. >> >> Thirdly, install a Maven Repository Manager (Nexus is one). >> This will act as a local proxy and make downloading times much faster. >> It also provides an aggregation point, so that there is only one repository >> to check each artifact for and the Repository Manager will hide checking the >> other repos MRMs also allow you to do whitelist/blacklist stuff to improve >> performance. >> If you are in a corporate environment you really want an MRM installed. >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@maven.apache.org >> For additional commands, e-mail: users-h...@maven.apache.org >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: users-unsubscr...@maven.apache.org >> For additional commands, e-mail: users-h...@maven.apache.org > > > -- > Ron Wheeler > President > Artifact Software Inc > email: rwhee...@artifact-software.com > skype: ronaldmwheeler > phone: 866-970-2435, ext 102 > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@maven.apache.org > For additional commands, e-mail: users-h...@maven.apache.org > -- Olivier Lamy Talend: http://coders.talend.com http://twitter.com/olamy | http://linkedin.com/in/olamy --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@maven.apache.org For additional commands, e-mail: users-h...@maven.apache.org
