From aa29f12d968f24d66f893bcc428b792e7e46dd33 Mon Sep 17 00:00:00 2001
From: noaso <noasoso@gmail.com>
Date: Wed, 16 Nov 2022 09:44:11 +0800
Subject: [PATCH] =?UTF-8?q?meta.dat=E6=96=87=E4=BB=B6=E6=95=B0=E6=8D=AE?=
 =?UTF-8?q?=E4=B8=A2=E5=A4=B1=20(#4397)?=
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

---
 .../com/alibaba/otter/canal/meta/FileMixedMetaManager.java  | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/meta/src/main/java/com/alibaba/otter/canal/meta/FileMixedMetaManager.java b/meta/src/main/java/com/alibaba/otter/canal/meta/FileMixedMetaManager.java
index 53d92701..0929f8c5 100644
--- a/meta/src/main/java/com/alibaba/otter/canal/meta/FileMixedMetaManager.java
+++ b/meta/src/main/java/com/alibaba/otter/canal/meta/FileMixedMetaManager.java
@@ -209,7 +209,11 @@ public class FileMixedMetaManager extends MemoryMetaManager implements CanalMeta
 
                 data.setClientDatas(clientDatas);
             }
-
+            //fixed issue https://github.com/alibaba/canal/issues/4312
+            //客户端数据为空时不覆盖文件内容 （适合单客户端）
+            if(data.getClientDatas().isEmpty()){
+                return;
+            }
             String json = JsonUtils.marshalToString(data);
             try {
                 FileUtils.writeStringToFile(dataFile, json);