Hacking PostgreSQL with Eclipse | PGConf EU 2017 | Metin Doslu

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Hacking PostgreSQL, writing patches or creating extensions, might seem intimidating at first. The PostgreSQL codebase is huge and ever-evolving. In this talk, I will show how Eclipse, with the help of gdb, can make it a lot more accessible. In this interactive talk, we will add the PostgreSQL project and set up gdb inside Eclipse. Then, we will walk step through the code using the debugger to reveal some of PostgreSQL internal data structures. We will show how to see the call stacks of errors and crashes, which saves a lot of headaches during development. Finally, we will show how to add a user-defined function that's written in C. At the end of the talk, the audience will be more familiar with a simple but powerful environment to hack PostgreSQL.

Hacking PostgreSQL with
Eclipse
Metin Döşlü
metin@citusdata.com
PGCONF.EU 2017
1

Motivation
2
Postgres can’t do everything
You can extend it
Eclipse makes it easy

Extensions
3
postGIS - Spatial and Geographic objects
pg_cron - Run periodic jobs
hll - HyperLogLog (approximate distinct count)
citus - Scale across multiple machines

Personal Story
4
Distributed PostgreSQL PostgreSQL Extension

Why Eclipse?
5
Start Fast
Easy Navigation
Rich Features

Demo Outline
6
PostgreSQL Inside Eclipse
Walking Around
Deep Dive

Demo Outline
7
PostgreSQL Inside Eclipse
Walking Around
Deep Dive

Build PostgreSQL
8
./configure CFLAGS=-"O0 -g"
make -s -j4
sudo make install

Import PostgreSQL into Eclipse
9
File -> Import
C/C++ -> Existing Code as Makefile Project
Turn off scalability mode (optional)

Demo Outline
10
PostgreSQL Inside Eclipse
Walking Around
Deep Dive

Attach GDB
11
select pg_backend_pid();
Debug As -> Debug Configurations
C/C++ Attach to Application

PostgreSQL Data Structures
12
Variables window
p pprint(parse)
printf "%s", pretty_format_node_dump(nodeToString(parse))
Preferences -> C/C++ -> Debug -> GDB -> Check “Show the GDB traces...”

Errors
13
errstart() in elog.c
if (elevel >= ERROR)

Crashes
14
pg_crasher

Demo Outline
15
PostgreSQL Inside Eclipse
Walking Around
Deep Dive

Gatekeeper
16
watch

Demo Outline
17
PostgreSQL Inside Eclipse
Walking Around
Deep Dive

Summary
18
Postgres can’t do everything
You can extend
Eclipse makes it easy

Hacking PostgreSQL with
Eclipse
Metin Döşlü
metin@citusdata.com
PGCONF.EU 2017
19

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Hacking PostgreSQL with Eclipse | PGConf EU 2017 | Metin Doslu

1. Hacking PostgreSQL with Eclipse Metin Döşlü metin@citusdata.com PGCONF.EU 2017 1

2. Motivation 2 Postgres can’t do everything You can extend it Eclipse makes it easy

3. Extensions 3 postGIS - Spatial and Geographic objects pg_cron - Run periodic jobs hll - HyperLogLog (approximate distinct count) citus - Scale across multiple machines

4. Personal Story 4 Distributed PostgreSQL PostgreSQL Extension

5. Why Eclipse? 5 Start Fast Easy Navigation Rich Features

6. Demo Outline 6 PostgreSQL Inside Eclipse Walking Around Deep Dive

7. Demo Outline 7 PostgreSQL Inside Eclipse Walking Around Deep Dive

8. Build PostgreSQL 8 ./configure CFLAGS=-"O0 -g" make -s -j4 sudo make install

9. Import PostgreSQL into Eclipse 9 File -> Import C/C++ -> Existing Code as Makefile Project Turn off scalability mode (optional)

10. Demo Outline 10 PostgreSQL Inside Eclipse Walking Around Deep Dive

11. Attach GDB 11 select pg_backend_pid(); Debug As -> Debug Configurations C/C++ Attach to Application

12. PostgreSQL Data Structures 12 Variables window p pprint(parse) printf "%s", pretty_format_node_dump(nodeToString(parse)) Preferences -> C/C++ -> Debug -> GDB -> Check “Show the GDB traces...”

13. Errors 13 errstart() in elog.c if (elevel >= ERROR)

14. Crashes 14 pg_crasher

15. Demo Outline 15 PostgreSQL Inside Eclipse Walking Around Deep Dive

16. Gatekeeper 16 watch

17. Demo Outline 17 PostgreSQL Inside Eclipse Walking Around Deep Dive

18. Summary 18 Postgres can’t do everything You can extend Eclipse makes it easy

19. Hacking PostgreSQL with Eclipse Metin Döşlü metin@citusdata.com PGCONF.EU 2017 19