为提高效率，请提供以下信息，问题描述清晰能够更快得到解决：
【TiDB 版本】
+--------------------+--------------+------+----+------+
| TiDB_version | Clu_replicas | TiDB | PD | TiKV |
+--------------------+--------------+------+----+------+
| 5.7.25-TiDB-v3.0.2 | 3 | 1 | 1 | 3 |
+--------------------+--------------+------+----+------+
【问题描述】
[2021/03/19 18:17:57.287 +08:00] [ERROR] [server.go:270] ["syncer exited abnormal"] [error="handlePreviousDDLJobIfNeed failed: handle ddl job ID:243, Type:modify schema charset and collate, State:synced, SchemaState:public, SchemaID:59, TableID:0, RowCount:0, ArgLen:0, start time: 2021-02-19 10:39:35.995 +0800 CST, Err:<nil>, ErrCount:0, SnapshotVersion:0 failed, the schema info: {\
\t\t\"hasImplicitCol\": false,\
\t\t\"schemaMetaVersion\": 0,\
\t\t\"schemaNameToID\": {\
\t\t\t\"ApolloConfigDB\": 152,\
\t\t\t\"ApolloPortalDB\": 122,\
\t\t\t\"FilterWords\": 223,\
\t\t\t\"hkuc\": 41,\
\t\t\t\"hkucc\": 59,\
\t\t\t\"mysql\": 3,\
\t\t\t\"test\": 1\
\t\t},\
\t\t\"tableIDToName\": {\
\t\t\t\"105\": {\
\t\t\t\t\"db-name\": \"hkucc\",\
\t\t\t\t\"tbl-name\": \"t_user_iphone_rela\"\
\t\t\t},\
\t\t\t\"109\": {\
\t\t\t\t\"db-name\": \"hkuc\",\
\t\t\t\t\"tbl-name\": \"t_user\"\
\t\t\t},\
\t\t\t\"11\": {\
\t\t\t\t\"db-name\": \"mysql\",\
\t\t\t\t\"tbl-name\": \"columns_priv\"\
\t\t\t},\
\t\t\t\"111\": {\
\t\t\t\t\"db-name\": \"hkuc\",\
\t\t\t\t\"tbl-name\": \"t_user_iptv\"\
\t\t\t},\
\t\t\t\"124\": {\
\t\t\t\t\"db-name\": \"ApolloPortalDB\",\
\t\t\t\t\"tbl-name\": \"App\"\
\t\t\t},\
\t\t\t\"126\": {\
\t\t\t\t\"db-name\": \"ApolloPortalDB\",\
\t\t\t\t\"tbl-name\": \"AppNamespace\"\
\t\t\t},\
\t\t\t\"128\"。。。。
---
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