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System ElasticSearch RiakDB
 Name ElasticSearch Riak
 Version Version 6.4.1 (released in September 2018) 2.2.0 (released Nov 17)
 Drawbacks Elasticsearch AMI not available basho.com had funding problems and the company was sold to bet365.com in aug 2017. There is little clarity on product vision after the sale
 Advantages Large number of drivers present for integration 1.http calls for crud operations(unlike sql queries) 2.multi-datacenter replication
 Languages Supported .Net Groovy Java JavaScript Perl PHP Python Ruby Ruby, Java, Erlang and Python
 Website www.elastic.co/­products/­elasticsearch www.basho.com
 XML Support no NA
 JSON Support yes yes
 Brief description Elasticsearch is a search engine based on Lucene. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. Distributed NoSQL key-value data store that offers high availability, fault tolerance, operational simplicity, and scalability. There are three variants riakkv (keyvalue), riakts(time series) and riakcs (distributed storage)
 Database Model Key Value NoSQL Model Key Value Store
 Technical Documentation www.elastic.co/­guide/­en/­elasticsearch/­reference/­current/­index.html https://docs.basho.com/
 License Open Source. Commercial version with HA available with redislabs.com Open Source. Multi Data Centre Replication needs an enterprise license
 Cloud-based / SaaS ElasticSearch Cloud Cluster available from ElasticSearch SaaS options AWS-https://aws.amazon.com/marketplace/pp/B00AMRXCQA/ref=mkt_m3_riak, On-Prem available as well
 Implementation Language C,C++ Erlang
 Operating System Supported Linux OS X Solaris Windows Linux , OS X, Windows
 Options for Integration / Access API Proprietary protocol using JSON Rest API, ProtocolBuffers, Native Erlang Interface
 Consistency Highly Consistent Eventual consistency
 Foreign Keys No No
 Streaming Support Yes No
 Analytics Support NA No
 Data Storage Schema Inverted Index Key Value Store with separate instances for timeseries,key-value and storage
 Notable Users -- weather.com,bestbuy.com,nhs.co.uk,github.com
 Key Differentiator No known Enterprise Competitor apart from Amazaon Cloud Search Multi DataCenter Replication. This feature is not offered by any other nosql vendor
 Concurrency Yes Yes
 Partitioning Yes Sharding
 Replication Yes Multi Data Center Replication supported
 Secondary Indexes Yes --
 SchemaLess Yes --
 SQL Query No --