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commit 4195e3722bfa5127fce9deb996290e1fface9f27
Author: Noah Misch <[email protected]>
AuthorDate: Fri Aug 5 08:30:58 2022 -0700

    Add HINT for restartpoint race with KeepFileRestoredFromArchive().
    
    The five commits ending at cc2c7d65fc27e877c9f407587b0b92d46cd6dd16
    closed this race condition for v15+.  For v14 through v10, add a HINT to
    discourage studying the cosmetic problem.
    
    Reviewed by Kyotaro Horiguchi and David Steele.
    
    Discussion: https://postgr.es/m/[email protected]
---
 src/backend/access/transam/xlog.c |  5 ++++-
 src/backend/storage/file/fd.c     | 10 ++++++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/backend/access/transam/xlog.c 
b/src/backend/access/transam/xlog.c
index 9288ef4b4b..d1ca208003 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -3523,7 +3523,10 @@ XLogFileInit(XLogSegNo logsegno, bool *use_existent, 
bool use_lock)
        if (fd < 0)
                ereport(ERROR,
                                (errcode_for_file_access(),
-                                errmsg("could not open file \"%s\": %m", 
path)));
+                                errmsg("could not open file \"%s\": %m", path),
+                                (AmCheckpointerProcess() ?
+                                 errhint("This is known to fail occasionally 
during archive recovery, where it is harmless.") :
+                                 0)));
 
        elog(DEBUG2, "done creating and filling new WAL file");
 
diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c
index 1e22fc6f61..73a53822b3 100644
--- a/src/backend/storage/file/fd.c
+++ b/src/backend/storage/file/fd.c
@@ -860,7 +860,10 @@ durable_rename_excl(const char *oldfile, const char 
*newfile, int elevel)
                ereport(elevel,
                                (errcode_for_file_access(),
                                 errmsg("could not link file \"%s\" to \"%s\": 
%m",
-                                               oldfile, newfile)));
+                                               oldfile, newfile),
+                                (AmCheckpointerProcess() ?
+                                 errhint("This is known to fail occasionally 
during archive recovery, where it is harmless.") :
+                                 0)));
                return -1;
        }
        unlink(oldfile);
@@ -870,7 +873,10 @@ durable_rename_excl(const char *oldfile, const char 
*newfile, int elevel)
                ereport(elevel,
                                (errcode_for_file_access(),
                                 errmsg("could not rename file \"%s\" to 
\"%s\": %m",
-                                               oldfile, newfile)));
+                                               oldfile, newfile),
+                                (AmCheckpointerProcess() ?
+                                 errhint("This is known to fail occasionally 
during archive recovery, where it is harmless.") :
+                                 0)));
                return -1;
        }
 #endif


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