| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | SATYANARAYANA NARLAPURAM <satyanarlapuram(at)gmail(dot)com> |
| Cc: | Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Throttling WAL inserts when the standby falls behind more than the configured replica_lag_in_bytes |
| Date: | 2021-12-29 19:39:31 |
| Message-ID: | 20211229193931.fmywh7qbiuc7b3mh@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2021-12-29 11:34:53 -0800, SATYANARAYANA NARLAPURAM wrote:
> On Wed, Dec 29, 2021 at 11:31 AM Andres Freund <andres(at)anarazel(dot)de> wrote:
> Andres, thanks for the comments. Agreed on this based on the previous
> discussions on this thread. Could you please share your thoughts on adding
> it after SyncRepWaitForLSN()?
I don't think that's good either - you're delaying transaction commit
(i.e. xact becoming visible / locks being released). That also has the danger
of increasing lock contention (albeit more likely to be heavyweight locks /
serializable state). It'd have to be after the transaction actually committed.
Greetings,
Andres Freund
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