Re: how to measure pglogical replication lag - Mailing list pgsql-hackers

From Craig Ringer
Subject Re: how to measure pglogical replication lag
Date
Msg-id CAMsr+YFCRJMQJA_KXdgmS2PrER606Mgj8t9m+BmN1Sg8HndbaQ@mail.gmail.com
Whole thread Raw
In response to how to measure pglogical replication lag  ("Guo, Yun" <YGuo@cvent.com>)
List pgsql-hackers
On 26 April 2016 at 03:08, Guo, Yun <YGuo@cvent.com> wrote:
Is there a function or view that could return a measurable replication lag of Pglogical  ?

It's the same as normal streaming replication. Use pg_stat_replication and/or pg_replication_slots to compare the LSN received by the client to the current server xlog insert position.

Like streaming replication there's currently no way to find out from the client side how far behind the client is. I think we should actually change that by sending an occasional message to the client with the server's current xlog insert position, though, so the client knows how far behind it is...

--
 Craig Ringer                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

pgsql-hackers by date:

Previous
From: Peter Geoghegan
Date:
Subject: Re: Fix for OpenSSL error queue bug
Next
From: Peter Geoghegan
Date:
Subject: Removing faulty hyperLogLog merge function