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Real Time Analytics with Cassandra
1.
Real Time Analytics
with Vagmi Mudumbai @vagmi / @reducedata
2.
What is Cassandra?
3.
Dynamo Based on
4.
Facebook Built by
5.
Key Value Store is
both a
6.
Column Store and a
7.
The CAP Theorem
8.
Column Families
9.
HashMap<RowKey,SortedMap<ColumnName, Value>>
10.
id name email
country 1 Vagmi me@vagmim.in IN 2 Karthik yeskarthik@blah IN 3 MarkZ mark@fb US Rowkey 1 2 3 name Vagmi Karthik MarkZ email me@vagmim.in yeskarthik@blah mark@fb country IN IN US
11.
The Problem
12.
As a user,
I want to view real time metrics and filter by dimensions like time, city, category, etc.
13.
select sum(measure) from
events where time between A and B and country=’US’ and device_platform=’Android’ The wrong way
14.
HashMap<RowKey,SortedMap<ColumnName, Value>>
15.
Counters
16.
create column family
view_counts_hourly with comparator=UTF8Type and default_validation_class=CounterColumnType and key_validation_class=UTF8Type;
17.
http://reducedata.com/, Chrome, 2014-03-14 15:30:00Z, IP,
Cookie-Info
18.
RowKey 20140101 20140102
20140103 20140104 ... ... 20140628 ... 20150308 sid1#us 2553 2341 2342 3242 ... ... 32342 ... 33423 sid1#us#chrome 1556 1532 1892 ... ... ... ... ... ... sid1#us#chrome#25 833 899 1200
19.
Uniques? but what about
20.
Bitmaps to the rescue
21.
1 0 1
0 1 1 0 0 0 1 1 0 1 0 0 1 u1 u2 u3 u4 u5 u6 u7 u8 u9 u10 u11 u12 u13 ... ... ...
22.
UID- 1328abc2838fd283e282 Fast Hash
Function - Murmur32 1 0 1 0 1 1 0 0 0 1 1 0 1 0 0 1 u1 u2 u3 u4 u5 u6 u7 u8 u9 u10 u11 u12 u13 ... ... ...
23.
RowKey 20140101 20140102
20140103 20140104 ... ... 20140628 ... 20150308 sid1#us 10101 10111 11100 11101 ... ... ... ... 11101 sid1#us#chrome ... ... ... ... ... ... ... ... ... sid1#us#chrome#25 10101 11101 11100 …. ... ... ... ... ...
24.
But I do
not have Big Data
25.
26.
Oh and we’re hiring (vagmi@reducedata.co)
27.
Thanks @vagmi on Github /
Twitter / Facebook
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