The document summarizes the speaker's use of Presto for log analysis. Key points include: - Presto was selected due to familiarity from others and ease of use compared to other options. - Presto is used for batch queries with Hive and interactive queries. Results are accessed through Cognos using Prestogres. - Managing Presto involves deployment with Ansible, configuration tuning, and monitoring with tools like GrowthForecast and jstat2gf. - While Presto has been stable overall, the speaker notes some version upgrade issues but sees leverage from its frequent updates.

1. Presto in my use case
Presto Meetup 2015/01/20
http://eventdots.jp/event/276987
@wyukawa

2. Agenda
• Log Analysis System Overview
• Why do I select Presto?
• How do I use Presto?
• How do I manage Presto?
• My impression for Presto

3. Log Analysis System Overview
Hadoop, Hive of HDP2.1
Azkaban
2.6.4
Presto 0.89
Cognos
10.2.1
Prestogres
0.4.8
DB
MySQL 5.5
DBDB
ETL with
Python 2.7.7
InfiniDB
Pentaho
Saiku
Shib

4. Why do I select Presto?
• my familiar(on Twitter) people use
• comparison with other is a bother
• Let s try!

5. How do I use Presto?
• batch with Hive on MR2(not Tez)
• select only with Presto
• execute adhoc query
• report by Cognos with Prestogres
• create presto view
http://d.hatena.ne.jp/wyukawa/20140824/1408881620

6. What is Cognos?
• Commercial BI tool by IBM
• Pros
• authorization management
• flexible reporting(but not easy)
• Cons
• slow rendering speed
• no permanent link
• difficult to understand error message
• web site(especially download site) is bad
• Windows and IE are necessary

7. What is Prestogres?
PostgreSQL
pgpool-II
(patched)
BI tool
Presto
Prestogres

8. Why do I use Prestogres?
• Interesting
• MySQL is possible to be a bottleneck
• Hadoop is easier to scale than MySQL
• reduce maintenance cost for multi storages
• but not achieve

9. Prestogres in my use case
Presto 0.89
Cognos
10.2.1
Prestogres
0.4.8
Prestogres
ODBC Driver
It is not easy to connect Cognos to Presto.
Thanks! > @frsyuki
http://d.hatena.ne.jp/wyukawa/20140623/1403521909

10. Problem in my use case
• Cognos don t issue where cause with Presgtogres+ODBC
• select … from … where yyyymmdd= 20150120 …
• slow rendering because of no predicate pushdown
• workaround is to use bigint to where cause, not string
• solution(not deploy in production. BTW, Thanks! > @frsyuki )
• Cognos 10.2.2
• patched(protocolVersion=2) PostgreSQL JDBC Driver
• Prestogres 0.6.3
• Presto 0.86
• increase dentry cache
http://d.hatena.ne.jp/wyukawa/20141216/1418706186

11. How do I manage Presto?
• How to deploy Presto?
• use Ansible
• Presto Setting
• task.cpu-timer-enabled=false
• How to monitor Presto?
• GrowthForecast + jstat2gf, JMX
• slow query visualization by nata2
http://d.hatena.ne.jp/wyukawa/20140803/1407052542
http://d.hatena.ne.jp/wyukawa/20141218/1418882574

12. My impression for Presto
• stable
• frequent version up
• easy to install
• easy to upgrade
• but failed at 0.80, 0.87
• leverage effect