From 6729c130f8dafd9117f491c0caa026bbfa575022 Mon Sep 17 00:00:00 2001
From: Benguang Zhao <bgzhao@taosdata.com>
Date: Thu, 24 Nov 2022 16:43:26 +0800
Subject: [PATCH] fix: leave some free space in log buffer during
 syncLogBufferInit

---
 source/libs/sync/src/syncPipeline.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/source/libs/sync/src/syncPipeline.c b/source/libs/sync/src/syncPipeline.c
index 891547e80f..f5f0ee7c69 100644
--- a/source/libs/sync/src/syncPipeline.c
+++ b/source/libs/sync/src/syncPipeline.c
@@ -182,7 +182,8 @@ int32_t syncLogBufferInitWithoutLock(SSyncLogBuffer* pBuf, SSyncNode* pNode) {
     }
 
     bool taken = false;
-    if (toIndex <= index + pBuf->size - 1) {
+    int  emptySize = 5;
+    if (toIndex - index + 1 <= pBuf->size - emptySize) {
       SSyncLogBufEntry tmp = {.pItem = pEntry, .prevLogIndex = -1, .prevLogTerm = -1};
       pBuf->entries[index % pBuf->size] = tmp;
       taken = true;