Re: BUG #14273: Tuple concurently updated error while creating function using async call from node js with postgresq

On Wed, Aug 3, 2016 at 3:00 AM, Alvaro Herrera <alvherre@2ndquadrant.com> wrote:
> hargudekishor@gmail.com wrote:
>
>> We have connected our node js application with postgresql-9.4.8.We have
>> several functions which are getting created in database using async call
>> from nodejs to postgresql server.but while creating those functions ,We are
>> encountered a error of "Tuple concurrently updated".
>
> Yeah, this is known.  We haven't worried too much, because the use case
> seems thin: why are you deleting and creating the function over and
> over?  Wouldn't it be better to create the function once and be done
> with it?

Hm. These days I have been pinged regarding the fact that it is
possible to reach this error on a relation that has a lot of updates
and where autovacuum is made more aggressive. Well, it increases the
possibility to face it. simple_heap_delete() is not used except for
catalogs, so could it be related to one of the pg_stat catalogs
complaining with VACUUM ANALYZE running in parallel?

>> And because of this error our node js application is getting
>> terminated.which is not affordable to us.
>
> Surely the application should be able to do something else upon
> receiving an error, rather than crashing.

That's for sure. A crash is a bad idea, and I recall that this is not
a critical failure.
--
Michael