Hi; The first link you provided includes ElasticSearch: http://en.wikipedia.org/wiki/NoSQL as a Document Store and plus a note that it is a search engine. What are the main differences between ElasticSearch and Solr that makes ElasticSearc a NoSQL store but not Solr. I think that these are conceptual things and such kind of references as like Wikipeda should not be the *only* reference.
I like this paper: http://www.thoughtworks.com/insights/articles/nosql-comparison and it explains the common features of NoSQL data stores as: * Easy to use in conventional load-balanced clusters * Persistent data (not just caches) * Scale to available memory * Have no fixed schemas and allow schema migration without downtime * Have individual query systems rather than using a standard query language * Are ACID within a node of the cluster and eventually consistent across the cluster However some others explain it differently. For example one says common features of NoSQL databases is that: *"What they have in common is that they're not relational. Their primary advantage is that, unlike relational databases, they handle unstructured data such as word-processing files, e-mail, multimedia, and social media efficiently."*[Leavitt, N., "Will NoSQL Databases Live Up to Their Promise?," Computer , vol.43, no.2, pp.12,14, Feb. 2010] I think that there is not a standard explanation for What is NoSQL. If we consider Solr as a NoSQL data store then we should consider that its primary objective is being a search engine. So it reminds some questions that is specific for a search engine as like deep paging. Basically if there is no limitation for such specific problems and if you have answers for that problems i.e. retrieving documents without scoring them as a stream then I think that these type of data stores are one of powerful NoSQL data stores. Reindexing the data maybe another problem to consider. However even if you still have such kind of problems you can still consider them as a NoSQL. There may be some data stores that is accepted as a NoSQL but have some big limitations. All in all, I think that there is not a reference definition for NoSQL. According to me SolrCloud is a so powerful search engine and it can be used and considered as a NoSQL data store. However if you want to use Solr (SolrCloud) as a NoSQL datastore you should consider what are your requirements and do you really need it. Thanks; Furkan KAMACI 2014-03-01 17:58 GMT+02:00 Gopal Patwa <gopalpa...@gmail.com>: > Well said Jack, we are using Solr as NoSQL solution as Jack describe from > Solr version 3.x and still using it in Production with 4.x and on our > Stubhub site most visited page. > > > https://m.stubhub.com/los-angeles-kings-tickets/los-angeles-kings-los-angeles-staples-center-1-3-2014-4323511/ > > > > On Sat, Mar 1, 2014 at 6:14 AM, Jack Krupansky <j...@basetechnology.com > >wrote: > > > A database is a place you store information for relatively permanent > > reference, called a "system of record". Most commonly data is accessed > by a > > primary key. Update of existing data by individual row is a common > > operation. > > > > Solr is a "search server" or "search platform". The focus of a search > > server is to support rapid and relevant rich search, especially keyword > > text search. Data itself usually lives elsewhere, but is loaded into the > > search server whenever it changes, a process known as "indexing". It is > not > > uncommon with a search server to "reindex" data, which means to throw all > > the data away and start over, rereading the data from its source(s) > > (system(s) of record). Update of existing data is usually in "batches", > not > > individual rows. Data tends to be added rather than updated. > > > > Commonly a search server is used in conjunction with some number of > > databases. > > > > Can one use Solr as a database as well? Sure, its possible, but that's > not > > its primary and most popular use at this point. > > > > I mean, what's one of the most commonly used verbs on the Solr email > list? > > We're always telling people to "reindex". Can you imagine database > > developers being told that they must delete all their existing data and > > "start over"? > > > > -- Jack Krupansky > > > > -----Original Message----- From: nutchsolruser > > Sent: Friday, February 28, 2014 11:09 PM > > To: solr-user@lucene.apache.org > > Subject: Solr is NoSQL database or not? > > > > > > You may think this is silly question but let me ask this because i am > > confused , > > http://www.lucidworks.com/webinar-solr-4-the-nosql-search-server/ this > > says > > Solr is NoSQL but many other links dont have solr in their list as NoSQL > > database. > > > > http://en.wikipedia.org/wiki/NoSQL > > http://en.wikipedia.org/wiki/Document-oriented_database > > > > it's really confusing what is real meaning of NoSQL database? > > > > > > > > -- > > View this message in context: http://lucene.472066.n3. > > nabble.com/Solr-is-NoSQL-database-or-not-tp4120554.html > > Sent from the Solr - User mailing list archive at Nabble.com. > > >
