Add a debug logging message when a resource manager rejects an attempted

restart point.  Per suggestion from Simon Riggs.

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 17ebaaaf027366a6da43ce18633d1ba172b5d201..0100b25639922e0df694117923f7bde0425d84b7 100644 (file)
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -5923,7 +5923,13 @@ RecoveryRestartPoint(const CheckPoint *checkPoint)
        {
                if (RmgrTable[rmid].rm_safe_restartpoint != NULL)
                        if (!(RmgrTable[rmid].rm_safe_restartpoint()))
+                       {
+                               elog(DEBUG2, "RM %d not safe to record restart point at %X/%X",
+                                        rmid,
+                                        checkPoint->redo.xlogid,
+                                        checkPoint->redo.xrecoff);
                                return;
+                       }
        }
 
        /*