A postCommit hook (configured in solrconfig.xml) is called in a safe
place for every commit.
You could have a program as a hook that normally did nothing unless
you had previously signaled to make a copy of the index.
Then I will give the postCommit trigger a try and hope that while the
trigger is executed, the files in data/index are in a consistent state
so that I can copy them.
Do you know how this signal can be communicated to the trigger at best?
I use Solrj and would call server.commit(), and unfortunately one can
not pass a commit message which could be used as signal for the trigger.
