Re: [HACKERS] pg_resetwal is broken if run from v10 against olderversion of PG data directory

On 29 May 2017 at 17:00, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Amit Kapila <amit.kapila16@gmail.com> writes:
>> I think this happens due to commit
>> f82ec32ac30ae7e3ec7c84067192535b2ff8ec0e which renames pg_xlog to
>> pg_wal.  It does take care of making some of the modules like
>> pg_basebackup to understand both old and new directory structures, but
>> not done for all the modules.
>
> check
>
>> I think we should make similar changes
>> in pg_resetwal or at the very least update the docs to indicate
>> pg_resetwal can give an error if used against pre-10 data directory.
>
> I think it's just horribly dangerous to run any version of
> pg_resetxlog/pg_resetwal against any major version other than its
> own.

Just check the name of the directory so that pg_resetwal will refuse
to run against pg_xlog directory

-- 
Simon Riggs                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services