Michael Marth created OAK-1979:
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Summary: prevent simultaneous installation of different instances
Key: OAK-1979
URL: https://issues.apache.org/jira/browse/OAK-1979
Project: Jackrabbit Oak
Issue Type: Improvement
Components: mongomk, rdbmk
Reporter: Michael Marth
Priority: Minor
For MongoMK and RDBMK: if the repository is empty and 1 Oak instance starts to
do an initial application installation (creating dbs, adding nodetypes, etc) we
should prevent a second instance from doing the same simultaneously. This would
happen e.g. when 2 instances are started at the same time.
The 1st instance could set a flag "initializing" that gets removed afterwards.
The 2nd instance should wait or abort.
In case the 1st instance does not finish the installation and does not remove
the flag we should have some "force install" behavior for the second instance
(alternatively we could prompt the user to drop the half-filled DBs).
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