1. 7 databases in 7 weeks Part 3. Riak

2. Yes and no  Yes  distributed  data-replicating  enhanced key-value store  no single point of failure  HTTP(Protobuf)  Availability  Speed, huge data handling

3. Yes and no  No  No need of scaling  Local distribution  Financial transactions  simple queryability  complex data structures  rigid schema

4. CRUD, Links, and MIMEs  http://localhost:8091/stats http://localhost:8091/stats  { "vnode_gets":0, "vnode_puts":0, "vnode_index_reads":0,... "connected_nodes":[dev2@127.0.0.1,"dev3@127.0.0.1"],dev2@127.0.0.1... "ring_members":["dev1@127.0.0.1","dev2@127.0.0.1","dev3@127.0.0.1 ], "ring_num_partitions":64, "ring_ownership":"[{'dev3@127.0.0.1',21},{'dev2@127.0.0.1',21},{'dev1 @127.0.0.1',22}]“... }

5. Bucket,value  http://SERVER:PORT/riak/BUCKET/KEY http://SERVER:PORT/riak/BUCKET/KEY  Curl –X GET http://localhost:8091/riak?buckets=true

6. Simple bad query  $curl –I http://localhost:8091/riak/no_bucket/no_key HTTP/1.1 404 Object Not Found Server: MochiWeb/1.1WebMachine/1.7.3(participate in the frantic) Date: Thu, 04 Aug 2011 01:25:49 GMT Content- Type: text/plain Content-Length:10

7. CRUD  Curl –v –X PUT http://localhost:8091/riak/animals/ace \ http://localhost:8091/riak/animals/ace -H "Content-Type: application/json“ \ -d '{"nickname“ : "The Wonder Dog", "breed":"GermanShepherd"}'  Returns 204  Curl http://localhost:8091/riak/animals/acehttp://localhost:8091/riak/animals/ace  Curl –I –X DELETE http://localhost:8091/riak/animals/ace

8. Links  Link: ;riaktag=\“fuu\“  Curl –X PUT http://localhost:8091/riak/cages/1\ -H "Content-Type: application/json"\ -H "Link: ;riaktag=\"contains\""\ -d '{"room":101}‘  link relationship is one-directional.  Link is returned in the header

9. Link walking  Curl http://localhost:8091/riak/cages/1/_,_,_ http://localhost:8091/riak/cages/1/_,_,_  /_,_,_ - bucket,tag,keep  Curl http://localhost:8091/riak/cages/2/_,next_ to,0/animals,_,_

10. MIME Types  Binary-encoded value  Curl –X PUT http://localhost:8091/riak/photos/polly.jpg \ -H "Content-type: image/jpeg"\ -H "Link: ;riaktag=\"photo\"" \ --data-binary @polly_image.jpg

11. Mapreduce

12. Mapreduce in riak

13. Reduce  Procedures, build in functions, keyfilters,link walking

14. Riak ring

15. Nodes/Writes/Reads  Curl http://localhost:8091/riak/animals/ace?r= 3 http://localhost:8091/riak/animals/ace?r= 3  {"n_val":3,"r":2,"w":1}  One,All,Quorum,Default(3)  Curl http://localhost:8091/riak/animals/polly?r= quorum

16. Conflicts and hooks  Vector Clocks  Resolving conflicts as in git,svn  Vector pruning  Pre/Post-commit Hooks

17. Search and index  Curl http://localhost:8091/solr/animals/select? q=breed:Shepherd http://localhost:8091/solr/animals/select? q=breed:Shepherd  Wild cards  Curl http://localhost:8091/solr/animals/select\ ?wt=json&q=nickname:rin%20breed:shepherd &q.op=and  Indexing is done on metadata attached