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How does it compare to elasticsearch?

Elasticsearch is a Fulltext search solution not a K/V Database.

Technically yes, but you can use elasticsearch as a distributed key-value store. I use it in production and it works amazingly well for me. Yes, searches may return stale data (one second old by default) but that is not much of a problem in my app.

That sounds both interesting and non-intuitive. Can you go into more detail about how you have been using ElasticSearch as a k/v store?

EDIT: Color me surprised. I didn't see it mentioned at all in the ElasticSearch docs or in their Github repo, but apparently this is a fairly popular thing to do.

"Elastic search as a database?" http://stackoverflow.com/questions/6636508/elastic-search-as...

"ElasticSearch, datastore for user and social data?" http://stackoverflow.com/questions/8190288/elasticsearch-dat...

"Elasticsearch and NoSql database" http://stackoverflow.com/questions/8026880/elasticsearch-and...

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