Re: logical replication snapshots

On 07/25/2018 07:57 PM, Andres Freund wrote:
> On 2018-07-25 12:31:01 -0700, Adrian Klaver wrote:

>>> Would "permission denied" be relevant?
>>
>> Logical decoding is something I am still learning. The "permission denied"
>> would to me be relevant only to the extent that it seems to be provoking:
> 
> Yes, it looks related. Looks like logical rep was trying to perform the
> intiial sync of those tables, and couldn't due to permission errors.

I'm not sure what happened, I remember the initial sync of that
particular schema failing on one table only, but looking at it now, all
tables are empty on the subscriber.

>> "LOG:  logical decoding found consistent point at 19/E6942440"
>> DETAIL:  There are no running transactions."
>>
>> Others with more experience in this area would need to fill whether that
>> might account for the 13 million files in the ~snapshot/ directory.
> 
> That indicates there's some error handling issues to be resolved. Petr?

It logs "COPY TO STDOUT", does that actually cache to disk (in ~snapshot/)?

Would it be safe to delete every file in ~snapshot/ older than some
X-number of minutes? (And what a good X might be?)

-- 
Dimitri Maziuk
Programmer/sysadmin
BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu