diff --git a/contrib/pg_visibility/pg_visibility.c b/contrib/pg_visibility/pg_visibility.c
index dd0c124..c1c5998 100644
--- a/contrib/pg_visibility/pg_visibility.c
+++ b/contrib/pg_visibility/pg_visibility.c
@@ -398,7 +398,7 @@ pg_truncate_visibility_map(PG_FUNCTION_ARGS)
 	if (BlockNumberIsValid(block))
 	{
 		fork = VISIBILITYMAP_FORKNUM;
-		smgrtruncate(rel->rd_smgr, &fork, 1, &block);
+		smgrtruncatelsn(rel->rd_smgr, &fork, 1, &block);
 	}
 
 	if (RelationNeedsWAL(rel))
@@ -411,7 +411,10 @@ pg_truncate_visibility_map(PG_FUNCTION_ARGS)
 
 		XLogBeginInsert();
 		XLogRegisterData((char *) &xlrec, sizeof(xlrec));
-
+		if (IsBootstrapProcessingMode() != true && InitdbSingle != true) {
+			RequestCheckpoint(CHECKPOINT_IMMEDIATE | CHECKPOINT_FORCE | CHECKPOINT_WAIT
+					  | CHECKPOINT_FLUSH_ALL);
+		}
 		XLogInsert(RM_SMGR_ID, XLOG_SMGR_TRUNCATE | XLR_SPECIAL_REL_UPDATE);
 	}
 
diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 282cd8b..a5d5898 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -8054,7 +8054,6 @@ data_buffer_for_replay(XLogReaderState *record,XLogRecPtr startLsn,XLogRecPtr en
 	uint32		buf_state;
 	bool valid;
 	BufferDesc *buf;
-	/* See if the block is in the buffer pool already */
 	//for pg master he3db slave or backup restore
 	SMgrRelation smgr = smgropen(rnode, InvalidBackendId);
 	smgrcreate(smgr, forknum, true);
@@ -8070,6 +8069,7 @@ data_buffer_for_replay(XLogReaderState *record,XLogRecPtr startLsn,XLogRecPtr en
 	} else {
 		elog(PANIC,"data_buffer_for_replay blockNum is P_NEW");
 	}
+	/* See if the block is in the buffer pool already */	
 	LWLockAcquire(partition_lock, LW_SHARED);
 	buf_id = BufTableLookup(&tag, hash);
 	/* If page is in buffer, we can apply record, otherwise we do nothing */
diff --git a/src/backend/catalog/storage.c b/src/backend/catalog/storage.c
index d25d41b..63a3368 100644
--- a/src/backend/catalog/storage.c
+++ b/src/backend/catalog/storage.c
@@ -350,7 +350,10 @@ RelationTruncate(Relation rel, BlockNumber nblocks)
 
 		XLogBeginInsert();
 		XLogRegisterData((char *) &xlrec, sizeof(xlrec));
-
+		if (IsBootstrapProcessingMode() != true && InitdbSingle != true) {
+			RequestCheckpoint(CHECKPOINT_IMMEDIATE | CHECKPOINT_FORCE | CHECKPOINT_WAIT
+					  | CHECKPOINT_FLUSH_ALL);
+		}
 		lsn = XLogInsert(RM_SMGR_ID,
 						 XLOG_SMGR_TRUNCATE | XLR_SPECIAL_REL_UPDATE);
 
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index d13608b..113b765 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -1034,7 +1034,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 			} while (!StartBufferIO(bufHdr, true));
 		}
 	}
-
+	
 	/*
 	 * if we have gotten to this point, we have allocated a buffer for the
 	 * page but its contents are not yet valid.  IO_IN_PROGRESS is set for it,
@@ -1172,6 +1172,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 							}
 						}
 					}
+					bufHdr->pageIsVaild = true;
 				}
 			} else 	{
 				smgrread(smgr, forkNum, blockNum, (char *) bufBlock);
@@ -1476,8 +1477,12 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 				 * If we get here, previous attempts to read the buffer must
 				 * have failed ... but we shall bravely try again.
 				 */
+				if (buf->pageIsVaild == false) {
+					*exist = false;
+				} else {
+					*exist = true;
+				}
 				*foundPtr = false;
-				*exist = true;
 			}
 		}
 
@@ -1696,6 +1701,11 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 					 * If we get here, previous attempts to read the buffer
 					 * must have failed ... but we shall bravely try again.
 					 */
+					if (buf->pageIsVaild == false) {
+						*exist = false;
+					} else {
+						*exist = true;
+					}
 					*foundPtr = false;
 				}
 			}
@@ -1748,7 +1758,7 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 		buf_state |= BM_TAG_VALID | BM_PERMANENT | BUF_USAGECOUNT_ONE;
 	else
 		buf_state |= BM_TAG_VALID | BUF_USAGECOUNT_ONE;
-
+	buf->pageIsVaild = false;
 	UnlockBufHdr(buf, buf_state);
 
 	if (oldPartitionLock != NULL)
@@ -1766,8 +1776,14 @@ BufferAlloc(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	 * to read it before we did, so there's nothing left for BufferAlloc() to
 	 * do.
 	 */
-	if (StartBufferIO(buf, true))
+	if (StartBufferIO(buf, true)) {
+		if (buf->pageIsVaild == false) {
+			*exist = false;
+		} else {
+			*exist = true;
+		}
 		*foundPtr = false;
+	}
 	else
 		*foundPtr = true;
 
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index 9661f83..afc64fd 100644
--- a/src/include/storage/buf_internals.h
+++ b/src/include/storage/buf_internals.h
@@ -55,6 +55,7 @@
  * Note: BM_TAG_VALID essentially means that there is a buffer hashtable
  * entry associated with the buffer's tag.
  */
+
 #define BM_LOCKED				(1U << 22)	/* buffer header is locked */
 #define BM_DIRTY				(1U << 23)	/* data needs writing */
 #define BM_VALID				(1U << 24)	/* data is valid */
@@ -197,6 +198,7 @@ typedef struct BufferDesc
 	int			wait_backend_pid;	/* backend PID of pin-count waiter */
 	int			freeNext;		/* link in freelist chain */
 	LWLock		content_lock;	/* to lock access to buffer contents */
+	bool        pageIsVaild;
 } BufferDesc;
 extern BufferDesc **bulk_io_in_progress_buf;