I would vote for a DNS issue Jeff Le 11 oct. 2012 08:08, "Ron Wheeler" <rwhee...@artifact-software.com> a écrit :
> 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. > > > > 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 > >
