From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> |
Cc: | Ajay Pratap <ajaypratap(at)drishti-soft(dot)com>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: PostgreSQL ping/pong to client |
Date: | 2019-04-17 14:48:19 |
Message-ID: | 30388.1555512499@sss.pgh.pa.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general |
Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> writes:
> On 4/17/19 5:39 AM, Ajay Pratap wrote:
>> 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.
>> 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.
An advisory lock wouldn't survive a server reboot, so there's something
not very accurate about this description.
I suspect what the OP wants is quicker detection of client connection
loss, and yes, messing with TCP timeouts and/or keepalive is the only way.
regards, tom lane
From | Date | Subject | |
---|---|---|---|
Next Message | Tim Kane | 2019-04-17 15:34:02 | Re: Alter domain type / avoiding table rewrite |
Previous Message | Ajay Pratap | 2019-04-17 14:39:30 | Re: PostgreSQL ping/pong to client |