topic Re: backup-lucene-indexes mirror of lucene-indexes ? in Alfresco Archive

backup-lucene-indexes mirror of lucene-indexes ?

zomurn — Sat, 20 Feb 2010 13:44:02 GMT

Hello,I was wondering if the folder alf_data/backup-lucene-indexes is a mirror of the folder alf_data/lucene-indexesBecause, I reindexed all so alf_data/lucene-indexes is healthy, and alf_data/backup-lucene-indexes contains some errors I know.Will the backup process will OVERWRITE all alf_data/backu

Re: backup-lucene-indexes mirror of lucene-indexes ?

pmonks — Sun, 21 Feb 2010 23:09:16 GMT

The alf_data/backup-lucene-indexes folder is recreated automatically every night by copying alf_data/lucene-indexes directory in its entirety. The only reason it exists is to support hot backup - Lucene does not cope well with concurrent access to its persisted files, so to support hot backup Alfresco (safely) duplicates alf_data/lucene-indexes, then the backup process must backup only the copy.

If you're performing cold backups exclusively, you need only backup alf_data/lucene-indexes - in fact you could shut off creation of alf_data/backup-lucene-indexes altogether, as that folder is irrelevant in that case.

The wiki page [1] has detailed information on the requirements for both cold and hot backup of Alfresco.

Cheers,
Peter

[1] http://wiki.alfresco.com/wiki/Backup_and_Restore

Re: backup-lucene-indexes mirror of lucene-indexes ?

zomurn — Mon, 22 Feb 2010 09:01:40 GMT

Thanks you very much for your reply, it was exactly what I expected