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From Alexander Rothenberg <a.rothenb...@fotofinder.net>
Subject How to LOCK the index-dir for changes from the IndexWriter
Date Fri, 18 Jun 2010 09:28:53 GMT
Hi,
im writing a RequestHandler that manages backups of the index-directory. 

Yea, i know theres already the Replication-RequestHandler that is also capable 
of creating backups, but i want the backupprocess to do some more action and 
not to depend on index-commit-points as the ReplicationHandler does. 
Reason is, we are running a custom DataImportHandler that starts a full-import 
with the option clean=false every 30 secs (That means, its doing changes to 
the current index every 30 secs). Also the importer-process never sends a 
commit (bacuse that made the whole server stuck for a few secs). 

So, i simply want to lock the index-directory with the same mechanism that is 
used when the index gets optimized. I took a look to DirectUpdateHandler2 / 
IndexWriter etc to find out what kind of lock is used but was not successful 
in implementing it to my RequestHandler :(

The big advantage of locking the index-dir would be that i dont have to stop 
the index-updating process. the import would automatically hold on until the 
lock is removed and the backup got finished. 

Regards, Alex


-- 
Alexander Rothenberg
Fotofinder GmbH		USt-IdNr. DE812854514
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10785 Berlin		Fax: +49 30 257928999

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Sitz:			Berlin

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