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Using Cassandra in a Telco Storage System

Pavel Pontryagin, senior developer

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* What hardware architecture we use

* How we model schema for call, client and graph data using NoSQL vs SQL

* NoSQL vs SQL insert-select performance

What we will discuss today is how we switched from SQL to NoSQL

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SQL

What and how much is Telco data

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* What is CDR? Under the hood.

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500 millions/day 100 millions/day

Scaling data in a traditional schema

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* Speed up processing *  Increase reliability * Decrease costs * Unify units  * Add new functionality

Unanswered questions. How to:

Solution for us is

Switch to Cassandra

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noSQL

How to load, model and query data

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The schema is

Local Storage

SSTable Loader

Local Storage

SSTable Loader

Local Storage

SSTable Loader

CDR files CDR files CDR files

Thrift Thrift Thrift 62Gb RAM 12 x CPU 2.50GHz 10Tb array

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SQL data Query

SELECT started, numA, numB FROM events_1003_main WHERE started > sysdate -1 and numA = ‘765-23-14’;

Data modeling. Calls

started numA numB Event type

Lac Cell IMSI IMEI

20131015210458 765-23-14 765-23-18 VOICE 2901 35140 IMSI1 IMEI1

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noSQL data “raw” data CALLS_201301 index cf CALLS_MSISDN_201301 Query

SliceQuery<String, Composite, String> sliceQuery; //define query sliceQuery.setColumnFamily(“CALLS_MSISDN_201301”); //define CF

sliceQuery.setKey(“201301.765-23-18”); //Query given msidn for given date Composite start = new Composite(); start.addComponent(0, “201301”, AbstractComposite.ComponentEquality.EQUAL); // from date Composite end = new Composite(); end.addComponent(0, “201303”, AbstractComposite.ComponentEquality.GREATER_THAN_EQUAL); // to date sliceQuery.setRange(start, end, false, 1000); QueryResult<ColumnSlice<Composite, String>> qr = sliceQuery.execute(); //get the result

uuid1 20131015210458,765-23-14,765-23-18,VOICE,2901,35140

201301.765-­‐23-­‐14   {2013-­‐10-­‐15  21/04/58:uuid1}  numB  

201301.765-­‐23-­‐18   {2013-­‐10-­‐15  21/04/58:uuid1}  numA.IMSI1.IMEI1  

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… where num like ‘%123’ Using SolR

Clone Keep using

+SolR indexing

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noSQL data “raw” data CALLS_201301 index cf CALLS_LAC_CELL_201301 Query

SliceQuery<String, Composite, Date> sliceQuery; //define query sliceQuery.setColumnFamily(“CALLS_LAC_CELL_201301”); //define CF

sliceQuery.setKey(“2013.05.01 15:15”); //Query given time slice Composite start = new Composite(); start.addComponent(0, “2901”, AbstractComposite.ComponentEquality.EQUAL); // from date Composite end = new Composite(); end.addComponent(0, “2901”, AbstractComposite.ComponentEquality.GREATER_THAN_EQUAL); // to date sliceQuery.setRange(start, end, false, 1000); QueryResult<ColumnSlice<Composite, Date >> qr = sliceQuery.execute(); //get the result

uuid1 20131015210458,765-23-14,765-23-18,VOICE,2901,35140

2013.05.01 15:15 {2901:35140: uuid1} 20131015210458

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SQL data Query SELECT distinct dn.msisdn, tl.name, t.full FROM SUBS_DATA.DCT_NUMS dn, SUBS_DATA.SUBS_NUMS_HIST snh, subs_data.clnt_attrs_hist cah, SUBS_DATA.DCT_NAMES t, dicts.telcos tl Where (dn.num_id = subn_num_id) and (cah.clnt_clnt_id = snh.clnt_clnt_id) and (t.name_id = cah.reg_name_id) and (tl.telco_id = dn.tlco_tlco_id) and (snh.started > to_date('10.09.2012', 'DD.MM.YYYY')) and (snh.started < to_date('17.09.2013', 'DD.MM.YYYY')) order by dn.msisdn;

Data modeling. Subscribers

started numA numB Event type

Lac Cell IMSI IMEI

20131015210458 765-23-14 765-23-18 VOICE 2901 35140 IMSI1 IMEI1

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noSQL “raw” subscribers data first slice update index cf SUBS_NAME

uuid1 Pavel, 765-23-14, address1, document1, 2, 21-01-2013, 1(active_status)

uuid2 Vadim, 765-23-16, address2, document2, 2, 21-01-2013, 1(active_status)

Pavel {21-01-2013: document1: 1} {21-01-2014: document1: 0} uuid1 uuid3

Vadim {21-01-2013: document2: 1}

uuid2

uuid3 Pavel, 765-23-14, address1, document1, 2, 21-01-2014, 0(active_status)

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Data modeling. Graph data

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noSQL graph data First record from the first switch Second record from the second switch CALLS_EDGES column family

2013/01/12.msisdn1 {VOICE: msisdn2: 1:uuid1} {VOICE: msisdn2: 2:uuid2} OUT OUT

2013/01/12.msisdn2 {VOICE: msisdn1: 1:uuid1} {VOICE: msisdn1: 2:uuid2} IN IN

uuid started numA numB Event type

subsciber

uuid1 2013/01/12 msisdn1 msisdn2 VOICE 1

uuid started numA numB Event type

subsciber

uuid2 2013/01/12 msisdn1 msisdn2 VOICE 1

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*  Loading speed *  Query speed *  Fun

Summary

Write,  rec/sec  

Oracle 10 000 Cassandra 5 000 per node

seconds  

Oracle > 1, depends on plans, statistics etc. Cassandra < 1, stable

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*  How to model "traditional" data *  How to add full-text search to intensive data load *  A couple of hardware issues

What we discussed today…

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THANK YOU

pavel.pontryagin@billing.ru

Pavel Pontryagin, senior developer