Re: .ready and .done files considered harmful

On Mon, Aug 2, 2021 at 9:06 AM Dipesh Pandit <dipesh.pandit@gmail.com> wrote:
> We can maintain the current timeline ID in archiver specific shared memory.
> If we switch to a new timeline then the backend process can update the new
> timeline ID in shared memory. Archiver can keep a track of current timeline ID
> and if it finds that there is a timeline switch then it can perform a full directory
> scan to make sure that archiving history files takes precedence over WAL files.
> Access to the shared memory area can be protected by adding a WALArchiverLock.
> If we take this approach then it doesn't require to use a dedicated signal to notify
> a timeline switch.

Hi,

I don't really understand why you are storing something in shared
memory specifically for the archiver. Can't we use XLogCtl's
ThisTimeLineID instead of storing another copy of the information?

Thanks,

-- 
Robert Haas
EDB: http://www.enterprisedb.com