If you're build a project with snapshots, m2 tries to download the newest versions of the snapshots even if the local ones are newer. Interestingly later on, the local versions are used. So the download is useless.
A complex test case for this is the Cocoon project where nearly all modules are snapshot and locally build.
|Fix Version/s||Reviewed [ 13555 ]|
|Resolution||Fixed [ 1 ]|
|Fix Version/s||2.0.6 [ 13010 ]|
|Fix Version/s||Reviewed Pending Version Assignment [ 13555 ]|
|Status||Open [ 1 ]||Closed [ 6 ]|
|Project Import||Sun Apr 05 08:49:45 UTC 2015 [ 1428223785911 ]|
|Workflow||jira [ 12713040 ]||Default workflow, editable Closed status [ 12752383 ]|
|Project Import||Sun Apr 05 21:45:26 UTC 2015 [ 1428270326204 ]|
|Workflow||jira [ 12949645 ]||Default workflow, editable Closed status [ 12985862 ]|