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From "Jeffrey Sinclair (JIRA)" <j...@apache.org>
Subject [jira] Commented: (IVY-1049) Describe how to setup the caches, especailly for multiple ivysettings.xml-s
Date Sun, 08 Nov 2009 19:55:32 GMT

    [ https://issues.apache.org/jira/browse/IVY-1049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774814#action_12774814
] 

Jeffrey Sinclair commented on IVY-1049:
---------------------------------------

Eric, to comment on your question: 'What does it matter which resolver actually was used to
populate the cache?'... 

Having the cache segregated by resolver is important when you have multiple repositories with
the same module naming convention. In the environment I work in we have two repositories:
one for production and one for development. We keep the organisation/module/revision the same
across the repositories to make it very easy to switch between them: i.e. you simply use a
different resolver. Perhaps branches could be used, however we liked the idea that you can
look at an ivysettings.xml file or ivy report and clearly see what development dependencies
you have, reducing the chance that someone might try to go into production with them.

Similarly a shared cache which is used to resolve 'shadow' dependencies in development needs
cache segregation by resolver in order to avoid different shadows trampling over the other's
meta data. If Ivy did not store which resolver was used to populate different artifacts in
the cache, it would not be able to handle this use-case.

With the exception of aggregate resolvers (such as the chain resolver), I would recommend
setting a cache per resolver to avoid any issues with the above scenarios.


> Describe how to setup the caches, especailly for multiple ivysettings.xml-s
> ---------------------------------------------------------------------------
>
>                 Key: IVY-1049
>                 URL: https://issues.apache.org/jira/browse/IVY-1049
>             Project: Ivy
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 2.0
>            Reporter: Daniel Dekany
>
> When using more the one ivysettings.xml-s inside the same user account (same computer),
the result is often a lot of "unknown resolver" errors, and other such mess. The cause is
that caches were not set up properly: I guess usually there should be one repository cache
per ivysettings.xml, then one dedicated resolution cache per ivysettings.xml too (at least,
because if parallel builds use a common ivysettings.xml, then each of them needs its own).
These I mostly deduced from mailing list discussions and experimenting, not from the documentation.
So, these things should be well described, and then linked from every place that's about wiring
ivysettings.xml-s. (Even maybe the "unknown resolver" error messages could contain a hint
about what the problem could be.) Also, the users should be warned about the importance of
lock strategies. (I know that in principle these could be find out from http://ant.apache.org/ivy/history/latest-release/concept.html#cache,
but that description is at best sparse, and the implications are not described. Also it's
not on a very well visible place.)

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