Don't archive bogus recycled or preallocated files after timeline switch.

After a timeline switch, we would leave behind recycled WAL segments that
are in the future, but on the old timeline. After promotion, and after they
become old enough to be recycled again, we would notice that they don't have
a .ready or .done file, create a .ready file for them, and archive them.
That's bogus, because the files contain garbage, recycled from an older
timeline (or prealloced as zeros). We shouldn't archive such files.

This could happen when we're following a timeline switch during replay, or
when we switch to new timeline at end-of-recovery.

To fix, whenever we switch to a new timeline, scan the data directory for
WAL segments on the old timeline, but with a higher segment number, and
remove them. Those don't belong to our timeline history, and are most
likely bogus recycled or preallocated files. They could also be valid files
that we streamed from the primary ahead of time, but in any case, they're
not needed to recover to the new timeline.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/backend/access/transam/xlogarchive.c b/src/backend/access/transam/xlogarchive.c
index 342975c7b64..a9c3791a5bc 100644
--- a/src/backend/access/transam/xlogarchive.c
+++ b/src/backend/access/transam/xlogarchive.c
@@ -693,6 +693,25 @@ XLogArchiveIsBusy(const char *xlog)
 }
 
 /*
+ * XLogArchiveIsReady
+ *
+ * Check to see if an XLOG segment file has an archive notification (.ready)
+ * file.
+ */
+bool
+XLogArchiveIsReady(const char *xlog)
+{
+	char		archiveStatusPath[MAXPGPATH];
+	struct stat stat_buf;
+
+	StatusFilePath(archiveStatusPath, xlog, ".ready");
+	if (stat(archiveStatusPath, &stat_buf) == 0)
+		return true;
+
+	return false;
+}
+
+/*
  * XLogArchiveCleanup
  *
  * Cleanup archive notification file(s) for a particular xlog segment