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![Flexible Schema name phone address 1 王小明 40666888 台北市 name phone address msn 2 王中明 28825252 台中市 [email_address] name mail address 3 王大明 [email_address] 台南市](https://image.slidesharecdn.com/nosqlwithcassandra-100423230531-phpapp02/85/NoSQL-with-Cassandra-19-320.jpg)
NoSQL with Cassandra
- 1. NoSQL with Cassandra [email_address]
- 2. Agenda Introduction How it work Data Model Roadmap
- 3. Cassandra? A high scalable, distributed, structured key-value database. Apache Top Level Project Open sourced by Facebook in 2008 BigTable+Dynamo
- 5. How it works? Decentralized (no single points of failure) Fault Tolerant Eventually Consistency
- 9. Read/Write
- 10. When write write to a disk commit log (sequential) replicate Memtable SSTable - stands for Sorted Strings Table compaction tombstone
- 12. When read Any node Wait for R responses Read-Repair Hinted-Handoff Slower than writes (but still fast) RowCached, KeyCached Scales to billions of rows
- 13. CAP theorem Consistency - all nodes see the same data at the same time Availibility - nodes failures do not prevent survivors from continue to operate Partition Tolerance - the system continues to operate despite arbitrary message lose from wikipedia
- 14. Consistency Write ZERO - asynchronously ANY ONE QUORUM - N / 2 + 1 ALL Read ONE - first node QUORUM - recent timestamp If W + R > N, you will have consistency W=1, R=N W=N, R=1 W=Q, R=Q where Q = N / 2 + 1
- 15. Data Model Column SuperColumn Row ColumnFamily Keyspace
- 16. Column { name: "mail", value: "ieon@pixnet.tw", timestamp: 123456789 }
- 17. ColumnFamily User { // Standard CF ma19: { // row key name: " 馬一九 ", // columns phone: "1919119", mail: "ma@foo" }, small_ben: { name: " 陳小扁 ", phone: "4848448", mail: "chen@bar", is_jailed: "true" } }
- 18. Traditional RDBMS name phone address 1 王小明 40666888 台北市 2 王中明 28825252 台中市 3 王大明 4129889 台南市
- 19. Flexible Schema name phone address 1 王小明 40666888 台北市 name phone address msn 2 王中明 28825252 台中市 [email_address] name mail address 3 王大明 [email_address] 台南市
- 20. Super Column Contact { // Super CF gasol: { // row key __all__: { // super column dad: "", // columns beer: "", ronny: "" }, pixnet: { // super column beer: "", ronny: "" }, family: { // super column dad: "" } } }
- 21. Sorting - Comparator BytesType - no validation AsciiType - like BytesType, but validates as ASCII LongType - 64 bit long UTF8Type - A string encoded as utf8 LexicalUUIDType - A 128 bit UUID, usually version 4 TimeUUIDType - a 128 bit version 1 UUID, compared by timestamp
- 22. Client API THRIFT-601 sending random data crashed thrift service THRIFT-347 PHP TSocket timeout issues Thrift sucks and ugly Apache Avro in trunk struct SliceRange { 1: required binary start, 2: required binary finish, 3: required bool reversed=0, 4: required i32 count=100, } struct SlicePredicate { 1: optional list<binary> column_names, 2: optional SliceRange slice_range, }
- 23. get(keyspace, key, ColumnPath) get_slice(keyspace, key, ColumnParent, SlicePredicate) multiget() * multiget_slice(keyspace, keys, ColumnParent, SlicePredicate) get_count() ! get_range_slice() * get_range_slices(keyspace, ColumnParent, SlicePredicate, KeyRange) insert(keyspace, key, ColumnPath, value, timestamp) batch_insert() * remove(keyspace, key, ColumnPath, timestamp) batch_mutate(keyspace, map<CF, list<Mutation>) ignore consistency_level * deprecated ! slow, deserialized all columns
- 24. Roadmap SSTable compression dynamic column family changes Vector clock support truncate support Memory efficient compactions Avro 0.7
- 25. Thank you