PostgreSQL 9.6 WAL interface about pgroonga

[jmealo]

@patrick-jones it looks like this is now an experimental feature http://pgroonga.github.io/reference/parameters/enable_wal.html

[kou]

I've implemented generic WAL support.
It's included in PGroonga as an experimental feature since PGroonga 1.1.6.

I'm writing document about it. I'll announce it after I've written it.

Anyway, could you test the feature and report your test result?

Here are instructions to use the feature:

1. Install (or upgrade to) PostgreSQL 9.6 on both master and slaves.

2. Install (or upgrade to) the latest PGroonga. on both master and slaves

3. Change postgresql.conf on only master like the followings:

   1. Change wal_level to replica or logical (normal configuration for streaming replication):

      wal_level = replica
      

   2. Increase max_wal_senders like the following (normal configuration for streaming replication):

      max_wal_senders = 5
      

   3. Change pgroonga.enable_wal to on:

      pgroonga.enable_wal = on
      

4. Add an user for replication to pg_hba.conf on only master like the following (normal configuration for streaming replication):

    local   replication     replica                                trust
    host    replication     replica        127.0.0.1/32            trust
    host    replication     replica        ::1/128                 trust
   

5. Run PostgreSQL on master.

6. Create PGroonga indexes on master.

7. Run SELECT pgroonga.command('io_flush'); and stop updating on master until the below pg_basebackup on slaves is finished.

8. Run pg_basebackup -h master.example.com -D DB_PATH --xlog --progress -U replica -R on slaves.

9. Change postgresql.conf on only slaves like the followings:

   1. Change hot_standby to on (normal configuration for streaming replication):

      hot_standby = on
      

10. Start PostgreSQL on slaves.

See also:

• pgroonga.enable_wal

[patrick-jones]

Very exciting news! I'll try it out this week.

[kou]

Thanks.
http://pgroonga.github.io/reference/replication.html will help you.

[kou]

If you find any problems for replication, please open a new issue.