On Thu, Jun 30, 2011 at 2:56 AM, Robert Haas <robertmhaas@gmail.com> wrote:
> On Wed, Jun 29, 2011 at 9:54 PM, Josh Berkus <josh@agliodbs.com> wrote:
>>> I am not sure exactly how walreceiver handles it if the disk is full.
>>> I assume it craps out and eventually retries, so probably what will
>>> happen is that, after the standby's pg_xlog directory fills up,
>>> walreceiver will sit there and error out until replay advances enough
>>> to remove a WAL file and thus permit some more data to be streamed.
>>
>> Nope, it gets stuck and stops there. Replay doesn't advance unless you
>> can somehow clear out some space manually; if the disk is full, the disk
>> is full, and PostgreSQL doesn't remove WAL files without being able to
>> write files first.
>>
>> Manual (or scripted) intervention is always necessary if you reach disk
>> 100% full.
>
> Wow, that's a pretty crappy failure mode... but I don't think we need
> to fix it just on account of this patch. It would be nice to fix, of
> course.
How is that different to running out of space in the main database?
If I try to pour a pint of milk into a small cup, I don't blame the cup.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services