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cache

immutable artifacts downloaded from a remote repository. No metadata is stored in this directory tree.

remote

contains a directory for each remote repository (by repository identifier). This contains the metadata and mutable artifacts from that repository. Metadata files will return to the format "maven-metadata.xml" instead of the current "maven-metadata-<id>.xml" file format. Files in these repositories will typically be snapshots and metadata for releases, since actual releases are not mutable and can be stored in the cache directory

workspace

contains a directory for each local workspace, with the primary one being default. This contains the metadata and files for any artifact built by maven (both snapshots, and releases).

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Rolling back a reactor build

About rolling back a whole reactor build...
I think it's something that would be separately configurable. I don't think it would be the default. The individual artifacts, once built, should be useful whether the rest build or not - but it really depends on your projectWhile this would be a separate feature, and not the default behaviour, it would now be possible to use a temporary workspace to build artifacts during a reactor build and merge them into another workspace on completion, making an entire reactor build "atomic" with respect to the local repository.

Co-existence with Maven 2.0.x

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