Ensure all replication message info is available and correct via WalRcv

diff --git a/src/backend/replication/walreceiver.c b/src/backend/replication/walreceiver.c
index b0a8b197603906d8c876e084fd3674a8f5d1b280..869457003aa403b33eb8a0eba5c948d1bcd9932e 100644 (file)
--- a/src/backend/replication/walreceiver.c
+++ b/src/backend/replication/walreceiver.c
@@ -218,7 +218,7 @@ WalReceiverMain(void)
    startpoint = walrcv->receiveStart;
 
    /* Initialise to a sanish value */
-   walrcv->lastMsgSendTime = walrcv->lastMsgReceiptTime = GetCurrentTimestamp();
+   walrcv->lastMsgSendTime = walrcv->lastMsgReceiptTime = walrcv->latestWalEndTime = GetCurrentTimestamp();
 
    SpinLockRelease(&walrcv->mutex);
 
@@ -749,6 +749,9 @@ ProcessWalSndrMessage(XLogRecPtr walEnd, TimestampTz sendTime)
 
    /* Update shared-memory status */
    SpinLockAcquire(&walrcv->mutex);
+   if (XLByteLT(walrcv->latestWalEnd, walEnd))
+       walrcv->latestWalEndTime = sendTime;
+   walrcv->latestWalEnd = walEnd;
    walrcv->lastMsgSendTime = sendTime;
    walrcv->lastMsgReceiptTime = lastMsgReceiptTime;
    SpinLockRelease(&walrcv->mutex);

diff --git a/src/backend/replication/walreceiverfuncs.c b/src/backend/replication/walreceiverfuncs.c
index b31e964fecd6276567ce8065810b17ded89d51d9..9eba180f04973df6c4f0bc5a73686f0aca5dcb14 100644 (file)
--- a/src/backend/replication/walreceiverfuncs.c
+++ b/src/backend/replication/walreceiverfuncs.c
@@ -260,7 +260,7 @@ GetReplicationApplyDelay(void)
 
    replayPtr = GetXLogReplayRecPtr(NULL);
 
-   if (XLByteLE(receivePtr, replayPtr))
+   if (XLByteEQ(receivePtr, replayPtr))
        return 0;
 
    TimestampDifference(GetCurrentChunkReplayStartTime(),

diff --git a/src/include/replication/walreceiver.h b/src/include/replication/walreceiver.h
index 8ef67f8a867a9c0cf64dfefda294134453aff4e5..62b6d2d93f0466d2a2488b70ddde84844e01d5a3 100644 (file)
--- a/src/include/replication/walreceiver.h
+++ b/src/include/replication/walreceiver.h
@@ -83,6 +83,12 @@ typedef struct
    TimestampTz lastMsgSendTime;
    TimestampTz lastMsgReceiptTime;
 
+   /*
+    * Latest reported end of WAL on the sender
+    */
+   XLogRecPtr  latestWalEnd;
+   TimestampTz latestWalEndTime;
+
    /*
     * connection string; is used for walreceiver to connect with the primary.
     */