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From Curtis Rueden <ctrue...@wisc.edu>
Subject Re: System-wide, read-only repository
Date Wed, 30 Oct 2013 15:37:42 GMT
Hi all,

There is plenty of room for improvement regarding reuse of Maven's local
repository cache. Releases in particular are supposed to be immutable so
once they are downloaded they could go into a read-only tier as suggested
by Stephen. Inventing such a scheme to reuse large portions of the repo
cache would be of great benefit to the Maven community.

E.g.: the recommended CIS strategy is for every job to use its own local
repo cache, which becomes very large. My Jenkins has dozens of Maven build
jobs and I cannot afford the bloat; my Jenkins backups are huge enough
already. So what I do instead is limit my Maven Jenkins node to a single
executor, which is a real waste on a 16 core machine. Much better would be
if the jobs could share the bulk of the repo cache.

So it's definitely an itch, but not quite itchy enough for anyone to
scratch yet...

Regards,
Curtis
 On Oct 30, 2013 8:35 AM, "Mark H. Wood" <mwood@iupui.edu> wrote:

> On Wed, Oct 30, 2013 at 10:18:49AM +0100, Matthieu Moy wrote:
> > Barrie Treloar <baerrach@gmail.com> writes:
> >
> > > On 29 October 2013 23:56, Lyons, Roy <Roy.Lyons@cmegroup.com> wrote:
> > >> Unfortunately, you will always have something in $HOME/.m2/repository
> > >> because that's how maven works.
> > >>
> > >> Can I suggest perhaps that you use zfs for deduplication in /home?
> > >> Otherwise, you can add something like
> > >
> > > Or give them more disk space - isn't this stuff meant to be cheap
> now-a-days?
> >
> > Local disk space is cheap. NFS-shared, RAID & backed-up disk space, less
> > so. I can live with a few Gb of waste, but I was just wondering whether
> > we could do any better.
>
> Disks are cheap.  But not free.  Running the procurement gantlet is
> not free.  Downtime to install new storage is not free.  Lord knows
> that additional backup tapes are not free, not even cheap.  Longer
> backup windows are not free.  Throwing storage at the problem is often
> a reasonable choice, but it's also reasonable to always ask if there
> isn't a better way.
>
> Sorry, I've been aching to write that for a long time....
>
> --
> Mark H. Wood, Lead System Programmer   mwood@IUPUI.Edu
> Machines should not be friendly.  Machines should be obedient.
>

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