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From Markus Jelsma <markus.jel...@openindex.io>
Subject RE: Pause and resume indexing on SolR 4 for backups
Date Thu, 20 Dec 2012 10:34:54 GMT
You can use the replication handler to fetch a complete snapshot of the index over HTTP.
http://wiki.apache.org/solr/SolrReplication#HTTP_API
 
 
-----Original message-----
> From:Andy D'Arcy Jewell <andy.jewell@sysmicro.co.uk>
> Sent: Thu 20-Dec-2012 11:23
> To: solr-user@lucene.apache.org
> Subject: Pause and resume indexing on SolR 4 for backups
> 
> Hi all.
> 
> Can anyone advise me of a way to pause and resume SolR 4 so I can 
> perform a backup? I need to be able to revert to a usable (though not 
> necessarily complete) index after a crash or other "disaster" more 
> quickly than a re-index operation would yield.
> 
> I can't yet afford the "extravagance" of a separate SolR replica just 
> for backups, and I'm not sure if I'll ever have the luxury. I'm 
> currently running with just one node, be we are not yet live.
> 
> I can think of the following ways to do this, each with various downsides:
> 
> 1) Just backup the existing index files whilst indexing continues
>      + Easy
>      + Fast
>      - Incomplete
>      - Potential for corruption? (e.g. partial files)
> 
> 2) Stop/Start Tomcat
>      + Easy
>      - Very slow and I/O, CPU intensive
>      - Client gets errors when trying to connect
> 
> 3) Block/unblock SolR port with IpTables
>      + Fast
>      - Client gets errors when trying to connect
>      - Have to wait for existing transactions to complete (not sure how, 
> maybe watch socket FD's in /proc)
> 
> 4) Pause/Restart SolR service
>      + Fast ? (hopefully)
>      - Client gets errors when trying to connect
> 
> In any event, the web app will have to gracefully handle unavailability 
> of SolR, probably by displaying a "down for maintenance" message, but 
> this should preferably be only a very short amount of time.
> 
> Can anyone comment on my proposed solutions above, or provide any 
> additional ones?
> 
> Thanks for any input you can provide!
> 
> -Andy
> 
> -- 
> Andy D'Arcy Jewell
> 
> SysMicro Limited
> Linux Support
> E:  andy.jewell@sysmicro.co.uk
> W:  www.sysmicro.co.uk
> 
> 

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