At first glance unless I missed something hourglass will definitely not work 
for our use-case which just involves real time inserts of new log data and no 
appends at all.  However I would like to examine the guts of hourglass to see 
if we can customize it for our use-case.

> From: arafa...@gmail.com
> Date: Mon, 27 May 2013 16:17:12 -0400
> Subject: Re: Keeping a rolling window of indexes around solr
> To: solr-user@lucene.apache.org
> 
> But how is Hourglass going to help Solr? Or is it a portable implementation?
> 
> Regards,
>    Alex.
> Personal blog: http://blog.outerthoughts.com/
> LinkedIn: http://www.linkedin.com/in/alexandrerafalovitch
> - Time is the quality of nature that keeps events from happening all
> at once. Lately, it doesn't seem to be working.  (Anonymous  - via GTD
> book)
> 
> 
> On Mon, May 27, 2013 at 3:48 PM, Otis Gospodnetic
> <otis.gospodne...@gmail.com> wrote:
> > Hi,
> >
> > SolrCloud now has the same index aliasing as Elasticsearch.  I can't lookup
> > the link now but Zoie from LinkedIn has Hourglass, which is uses for
> > circular buffer sort of index setup if I recall correctly.
> >
> > Otis
> > Solr & ElasticSearch Support
> > http://sematext.com/
> > On May 24, 2013 10:26 AM, "Saikat Kanjilal" <sxk1...@hotmail.com> wrote:
> >
> >> Hello Solr community folks,
> >> I am doing some investigative work around how to roll and manage indexes
> >> inside our solr configuration, to date I've come up with an architecture
> >> that separates a set of masters that are focused on writes and get
> >> replicated periodically and a set of slave shards strictly docused on
> >> reads, additionally for each master index the design contains partial
> >> purges which get performed on each of the slave shards as well as the
> >> master to keep the data current.   However the architecture seems a bit
> >> more complex than I'd like with a lot of moving pieces.  I was wondering if
> >> anyone has ever handled/designed an architecture around a "conveyor belt"
> >> or rolling window of indexes around n days of data and if there are best
> >> practices around this.  One thing I was thinking about was whether to keep
> >> a conveyor belt list of the slave shards and rotate them as needed and drop
> >> the master periodically and make its backup temporarily the master.
> >>
> >>
> >> Anyways would love to hear thoughts and usecases that are similar from the
> >> community.
> >>
> >> Regards
                                          

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