[orion-dev] Pushing new version of Orion server metadata storage to mast

[Anthony Hunter <anthonyh@xxxxxxxxxx>]

Hi Team,

I am pushing the changes to master today
that will bring the Orion metadata storage to a new version. The motivation
is described in Bugzilla 439732 [1] but to summarize:

a) Maintaining multiple version of metadata
storage was painful. Starting with Orion 7.0 and going forward, we will
have one version of the metadata storage format. 

b) The migration process in previous
versions of the Orion metadata storage was to backup the server, toggle
the server properties in the orion.conf and run the migration. This process
required more than one second of server downtime, both to do a proper backup,
update a configuration file and to run the migration. We determined that
this process is not acceptable. The latest version of the Orion metadata
storage (version 7) now has a live migration that updates each user as
they log in to the latest format. Users are also updated as they are accessed
offline, like during indexing. Bottom line is that when the server restarts,
the metadata is migrated and users can immediately login. The time to update
one user is about 10ms, unnoticeable.

The logs will include full details of
every aspect that was changed during migration:

Migration: Start migrating user anthony
to the latest (version 7)
Migration: Updated Orion version from
version 4 to version 7 in metadata file: /workspace/foo/an/anthony/OrionContent/Project.json
Migration: Updated the ContentLocation
in metadata file: /workspace/foo/an/anthony/OrionContent/Project.json
Migration: Old project metadata file
/workspace/foo/an/anthony/OrionContent/Project.json has been moved to /workspace/foo/an/anthony/Project.json
Migration: Updated Orion version from
version 4 to version 7 in metadata file: /workspace/foo/an/anthony/OrionContent/ahunter-orion.github.com.json
Migration: Updated the ContentLocation
in metadata file: /workspace/foo/an/anthony/OrionContent/ahunter-orion.github.com.json
Migration: Old project metadata file
/workspace/foo/an/anthony/OrionContent/ahunter-orion.github.com.json has
been moved to /workspace/foo/an/anthony/ahunter-orion.github.com.json
Migration: Updated Orion version from
version 4 to version 7 in metadata file: /workspace/foo/an/anthony/OrionContent/workspace.json
Migration: Old workspace metadata file
/workspace/foo/an/anthony/OrionContent/workspace.json has been moved to
/workspace/foo/an/anthony/anthony-OrionContent.json
Migration: Updated Orion version from
version 4 to version 7 in metadata file: /workspace/foo/an/anthony/user.json
Migration: Finished migrating user anthony

If you encounter any issues please let
us know.

[1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=439732
Remove simple/simple2 and have only one version of the the server metadata


Cheers...
Anthony