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NameLanguageLicensePartitioningExpansionSLOCPersistenceClient ProtocolData modelDocsCommunity
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CassandraJavaApache 2YesYes33000Custom on-diskThriftBigtableFFacebook, no
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CouchDBErlangApache 2No-13000Custom on-diskJSON over HTTPDocumentAApache, yes
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DynomiteErlangApache 2Yes10000Pluggable: couch, detsCustom ascii, Thrift, ErlangKVD+Powerset, no
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GlusterFSCYesYesCustom on-diskPOSIXFileA
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HBaseJavaApache 2YesYes78000Custom on-diskCustom API, Thrift, RestBigtableAApache, yes
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HypertableC++GPL 2YesPresumably73000Custom on-diskThrift, otherBigtableAZvents, Baidu, yes
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KaiErlangYesOn-disk Dets fileMemcachedKVCno
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MemcachedCNoYesNoMemcachedKVADanga, FB, good
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MemcacheDBCBSD-like ?No-5700BerkeleyDBMemcachedKVBsome
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MogileFSPerlYesYesUnmodified files on diskCustom/HTTPFileC+Danga, not too bad
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MongoDBC++AGPL 3Soon-48000Document
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Project VoldemortJavaYesNo23000Pluggable: BerkleyDB, MySQLJava APIStructured / blob / textALinkedin, no
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RedisCBSD (new)No-9262Custom on-disk, snapshottingMemcached-ishKV & other data structuresB+Growing
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RiakErlangApache 2YesYesCustom on-diskJSON over HTTPDocumentB+
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RingoErlangYesCustom on-disk (append only log)HTTPKVBNokia, no
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ScalarisErlangApache 2Yes35000NoErlang, Java, HTTPKVBOnScale, no
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ThruDBC++No-Pluggable: BerkleyDB, Custom, Mysql, S3ThriftDocument orientedC+Third rail, unsure
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Tokyo CabinetCNo-Custom on-diskblobA
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