Re: Clarify old WAL files cannot be removed until they are summarized

On 2024/12/11 9:18, Michael Paquier wrote:
> On Fri, Oct 18, 2024 at 02:25:15AM +0900, Fujii Masao wrote:
>> The documentation in wal.sgml explains that old WAL files cannot be
>> removed or recycled until they are archived (when WAL archiving is used)
>> or replicated (when using replication slots). However, it did not
>> mention that, similarly, old WAL files are also kept until they are summarized
>> if WAL summarization is enabled. Attached patch adds that clarification to
>> the documentation. Thought?
>>
>> @@ -643,6 +643,8 @@
>>      until the situation is resolved. A slow or failed standby server that
>>      uses a replication slot will have the same effect (see
>>      <xref linkend="streaming-replication-slots"/>).
>> +   Similarly, if WAL summarization is enabled, old segments are kept
>> +   until they are summarized.
>>     </para>
> 
> Sounds like a good idea to me.  I'd suggest to add a link to
> runtime-config-wal-summarization as it is the first reference to WAL
> summarization in this file.

Yes, that sounds like a good idea. I've updated the patch accordingly.

Regards,

-- 
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION