Re: [RFC][PATCH] BDR Prototype startup instructions (not prematurely sent this time)

Hi,

The patch as of yet doesn't contain how you actually can use the prototype...
Obviously at this point its not very convenient:

I have two config files:
Node 1:
port = 5501
wal_level = logical
max_wal_senders = 10
wal_keep_segments = 200
multimaster_conninfo = 'port=5502 host=/tmp'
multimaster_node_id = 1

Node 2:
port = 5502
wal_level = logical
max_wal_senders = 10
wal_keep_segments = 200
multimaster_conninfo = 'port=5501 host=/tmp'
multimaster_node_id = 2

after initdb'ing the first cluster (initdb required):
$ ~/src/postgresql/build/assert/src/backend/postgres -D
~/tmp/postgres/bdr/1/datadir/ -c
config_file=~/tmp/postgres/bdr/1/postgresql.conf -c
hba_file=~/tmp/postgres/bdr/1/pg_hba.conf -c
ident_file=~/tmp/postgres/bdr/1/pg_ident.conf

$ psql -p 5501 -U andres postgres
CREATE TABLE data(id serial primary key, data bigint);
ALTER SEQUENCE data_id_seq INCREMENT 2;
SELECT setval('data_id_seq', 1);

shutdown cluster

$ rsync -raxv --delete /home/andres/tmp/postgres/bdr/1/datadir/*
/home/andres/tmp/postgres/bdr/2/datadir

start both clusters which should sync after some output.

$ psql -p 5501 -U andres postgres

INSERT INTO data(data) VALUES (random()*10000) RETURNING *;
INSERT INTO data(data) VALUES (random()*10000) RETURNING *;
INSERT INTO data(data) VALUES (random()*10000) RETURNING *;
INSERT INTO data(data) VALUES (random()*10000) RETURNING *;

$ psql -p 5502 -U andres postgres
SELECT setval('data_id_seq', 2);

INSERT INTO data(data) VALUES (random()*10000) RETURNING *;
INSERT INTO data(data) VALUES (random()*10000) RETURNING *;
INSERT INTO data(data) VALUES (random()*10000) RETURNING *;
INSERT INTO data(data) VALUES (random()*10000) RETURNING *;
INSERT INTO data(data) VALUES (random()*10000) RETURNING *;

postgres=# SELECT * FROM data;
id | data
----+------
3 | 396
5 | 2522
7 | 275
9 | 9632
11 | 1176
4 | 6977
6 | 7339
8 | 6383
10 | 4600
12 | 8878
14 | 1987
(11 rows)

$ psql -p 5501 -U andres postgres
id | data
----+------
3 | 396
5 | 2522
7 | 275
9 | 9632
11 | 1176
4 | 6977
6 | 7339
8 | 6383
10 | 4600
12 | 8878
14 | 1987
(11 rows)

DELETE FROM data;

$ psql -p 5502 -U andres postgres
SELECT * FROM data;
id | data
----+------
(0 rows)

There is not much more you can do at this time. You can run an unmodified
pgbench if you do it before the rsync if you prohibit vacuum (-n) which
actually does a truncate on the history table.

Hope that helps the brave sould already trying this,

Andres