Re: RDS restore failed due to WAL log and disk space-- any tidy fixes?

Doesn't RDS have its own replication?

Anyway, for pg_restore, I'd absolutely set archive_mode=off
and wal_level=minimal, then set them to their production values when it's
finished.

On Sun, Nov 17, 2024 at 12:12 PM Wells Oliver <wells(dot)oliver(at)gmail(dot)com>
wrote:

> Interesting. I am migrating a pg_dump archive to a new server, in a single
> go. Does it make sense to disable (or speed up?) WAL archiving during the
> restore, then reenable it after the restore so a future replica could work?
> What would be the steps here? Would disabling or "speeding up" be faster?
>
> max_slot_wal_keep_size is -1 at the moment so I think that's why it kept a
> ton of WAL and ran out of space.
>
> On Sun, Nov 17, 2024 at 7:41 AM Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
> wrote:
>
>> On Sat, 2024-11-16 at 16:33 -0800, Wells Oliver wrote:
>> > I provisioned an RDS instance with 2500GB space and began the restore
>> of a database I know to be about 1750 GB using 16 jobs.
>> >
>> > Unfortunately, it died very near the end when it ran out of disk space
>> due to WAL log usage. Lots of:
>> >
>> > 2024-11-17 00:07:09 UTC::@:[19861]:PANIC: could not write to file
>> "pg_wal/xlogtemp.19861": No space left on device
>> >
>> >
>> > And then kaboom.
>> >
>> > I'm wondering what my course of action should be. Can I disable/reduce
>> WAL during a restore?
>> > wal_level is set to replica, can this temporarily be set to minimal?
>> Should I just eat the extra
>> > costs to add headroom for the WAL? Would using fewer jobs during a
>> restore reduce the amount of WAL
>> > created?
>>
>> If you are using minimal WAL logging and you restore the dump in a single
>> transaction, you
>> should see way less WAL generated, because data inserted into the table
>> in the same transaction
>> as the CREATE TABLE statement need not be WAL logged.
>>
>> But you might more easily solve the problem by speeding up or disabling
>> the WAL archiver,
>> so that PostgreSQL removes old WAL after the next checkpoint.
>>
>> Yours,
>> Laurenz Albe
>>
>
>
> --
> Wells Oliver
> wells(dot)oliver(at)gmail(dot)com <wellsoliver(at)gmail(dot)com>
>

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