From 43a1419b075bf45e57e85699ac905f9f91ece1c3 Mon Sep 17 00:00:00 2001
From: liuchengyu <liuchengyu@360.cn>
Date: Mon, 4 Mar 2024 11:31:25 +0800
Subject: [PATCH] fix: master has db data, but no binlog. a new slave has
 replication_id in its config. this must execute full sync(#2436)

---
 src/pika_repl_server_conn.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/pika_repl_server_conn.cc b/src/pika_repl_server_conn.cc
index 21847db3cd..78b2b8638d 100644
--- a/src/pika_repl_server_conn.cc
+++ b/src/pika_repl_server_conn.cc
@@ -202,6 +202,13 @@ bool PikaReplServerConn::TrySyncOffsetCheck(const std::shared_ptr<SyncMasterDB>&
     return false;
   }
 
+  if (boffset.filenum == slave_boffset.filenum() && slave_boffset.filenum() == 0 && 
+      boffset.offset == slave_boffset.offset() && slave_boffset.offset() == 0) {
+    LOG(INFO) << "maybe a new master and slave, there is no binlog, but has db data, this need full sync";
+    try_sync_response->set_reply_code(InnerMessage::InnerResponse::TrySync::kSyncPointBePurged);
+    return false;
+  }
+
   PikaBinlogReader reader;
   reader.Seek(db->Logger(), slave_boffset.filenum(), slave_boffset.offset());
   BinlogOffset seeked_offset;