Re: PostgreSQL ping/pong to client

Correction: I meant when my java application dies postgres should break all
the connections that were associated with that peer.

On Wed, Apr 17, 2019, 19:59 Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> wrote:

> On 4/17/19 5:39 AM, Ajay Pratap wrote:
> > Hello there,
> > I am using PostgreSQL 10.7 as the database, and have Java web app. My
> > app takes a lock on the database using the following command whenever my
> > server is starting.
> > /select /pg_try_advisory_lock/(100)/
> > To make sure only one instance of the App is using the database at a
> time.
> > There have been several instances when my server crashes(or stops/ or
> > kill), but this lock still remained on the PostgreSQL. Ideally, this
> > should not happen because TCP connection breaks if one of the peers
> > dies, but it happens otherwise.
>
> If the server is exiting uncleanly I am not sure how it will gracefully
> close connections.
>
> > To solve this problem PostgreSQL needs to break the connection if the
> > client dies.
>
> But the problem as you describe it is that the server dies not the client.
>
> > One of the methods is to configure TCP timeout but since this is very
> > impactful and hence unrealistic.
> > I was wounding how can out of the box PostgreSQL help me solve this.
> > May be like a ping pong service to check if client is still alive.
> >
> > Thanks and regards,
> > Ajay Pratap,
> > Software Engineer,
> > Drishti-Soft
> >
> >
>
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com
>

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