Re: Notification or action when WAL archives fully restored and streaming replication started

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Hi,
I've got master/slave replication setup between a few hosts. At any
point a slave could become a master. I've got appropriate locking in
place using an external system so that only one master can exist at a
time. I'm having trouble determining when my slaves are in sync with the
current master so that they can be a candidate for promotion. I want
some form of indicator _without reading a log_ when streaming
replication has started.

My recovery.conf for slaves:
  standby_mode = on
  restore_command = 'gunzip < /archives/wal/%f > %p'
  recovery_target_timeline = 'latest'
  primary_conninfo = 'host=PGSQL_FRONTEND_NAME port=5432
user=PGSQL_RECOVERY_USER password=PGSQL_RECOVERY_PASS'

Appropriate postgresql.conf:
  wal_level = replica
  archive_mode = on
  archive_command = 'test ! -f /archives/wal/%f && gzip < %p >
/archives/wal/%f'
  archive_timeout = 15min

Regards,
Michael Cassaniti
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