Re: The last WAL segment of the old timeline is not archived for a while after archive recovery

Fujii Masao wrote:
> In archive recovery, the last applied WAL segment may not have
> .ready file in spite of not having been archived yet. Then, this
> segment is not archived until a future checkpoint creates .ready
> file. It's a little dangerous that there is the WAL segment which
> is not archived for a while.
> 
> Attached patch fixes this problem. Is this worth committing?

Yeah, I think it is. Applied.

BTW, I notice that we have the same problem with WAL files that have 
been manually copied into pg_xlog, in the unlikely corner case that the 
"backup redo point", ControlData->checkpointCopy, points to the 
first-ever WAL file. That's because we then skip the 
RemoveOldXlogFiles() step in the startup checkpoint, which normally 
creates the .ready files for all but the last WAL file. I don't think 
that happens in practice, and if it does, the files will still be 
archived at the next checkpoint, so I think we can leave it as it is.

--   Heikki Linnakangas  EnterpriseDB   http://www.enterprisedb.com