Cassandra Data Model

the cassandra data model eben hewitt cassandra summit - san francisco 8.10.2010

[object Object],[object Object],[object Object]

things we know about cassandra ,[object Object],[object Object]

consistency ,[object Object],1

PACELC ,[object Object],[object Object],[object Object],[object Object],[object Object]

cassandra is consistent when read replica count + write replica count > replication factor cassandra is consistent if you read & write at CL.QUORUM (once Q nodes are up) good place to start ,[object Object],r = # of nodes consulted during read op w = # of replicas consulted during write op n = replicas r + w + n = consistent

cassandra is row-oriented ,[object Object],[object Object],2

column ,[object Object],[object Object],email : alison@foo.com : 12578123685

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],column family

super column super columns group columns under a common name

about super column families ,[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],s super column super column family flexible schema key column super column family

what about… ,[object Object],[object Object],[object Object],[object Object],?

rdbms : domain-based model what answers do I have? cassandra : query-based model what questions do I have?

Questions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SELECT WHERE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SELECT WHERE pt 2

ORDER BY ,[object Object],[object Object],[object Object],[object Object],[object Object],Columns are sorted according to CompareWith or CompareSubcolumnsWith

JOIN ON ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

GROUP ,[object Object],[object Object]

[object Object],materialized view

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],materialized view

[object Object],valueless column

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],valueless column

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],composite key

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],semantic key

[object Object],client clock sync

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],client clock sync

is cassandra a good fit? ,[object Object],[object Object],[object Object],[object Object]

custom comparators ,[object Object],[object Object],[object Object]

choose keys carefully ,[object Object],[object Object],[object Object],[object Object]

new use cases ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

see also ,[object Object],[object Object]

[object Object],[object Object]

Cassandra Data Model

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Cassandra Data Model