为提高效率，提问时请提供以下信息，问题描述清晰可优先响应。
- 【TiDB 版本】：v3.0.4
- 【问题描述】：drainer 角色无法启动
[2020/08/14 23:18:25.949 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.950 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.950 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.970 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.971 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.972 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.973 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=users]
[2020/08/14 23:18:25.974 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.974 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.975 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.976 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.977 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:25.978 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=保密] [table=保密]
[2020/08/14 23:18:26.021 +08:00] [INFO] [collector.go:284] [“get ddl job”] [job=“ID:3532, Type:modify table charset and collate, State:synced, SchemaState:public, SchemaID:215, TableID:3514, RowCount:0, ArgLen:0, start time: 2020-08-08 15:20:58.96 +0800 HKT, Err:, ErrCount:0, SnapshotVersion:0”]
[2020/08/14 23:18:26.021 +08:00] [INFO] [syncer.go:400] [“add ddl item to syncer, you can add this commit ts to ignore-txn-commit-ts to skip this ddl if needed”] [sql=“ALTER TABLE backmessage\r\
DEFAULT CHARACTER SET=utf8mb4”] [“commit ts”=418610219466096702]
[2020/08/14 23:18:26.038 +08:00] [INFO] [load.go:241] [“refresh table info”] [schema=bigdata] [table=backmessage]
[2020/08/14 23:18:26.039 +08:00] [INFO] [load.go:435] [“Run()… in Loader quit”]
[2020/08/14 23:18:26.039 +08:00] [INFO] [load.go:715] [“txnManager has been closed”]
[2020/08/14 23:18:26.039 +08:00] [INFO] [load.go:659] [“run()… in txnManager quit”]
[2020/08/14 23:18:26.039 +08:00] [INFO] [mysql.go:117] [“Successes chan quit”]
[2020/08/14 23:18:26.039 +08:00] [ERROR] [syncer.go:416] [“Failed to close syncer”] [error=“table not exist”] [errorVerbose=“table not exist\ngithub.com/pingcap/tidb-binlog/pkg/loader.init.ializers\
\t/home/jenkins/workspace/release_tidb_3.0/go/src/github.com/pingcap/tidb-binlog/pkg/loader/util.go:28\
runtime.main\
\t/usr/local/go/src/runtime/proc.go:188\
runtime.goexit\
\t/usr/local/go/src/runtime/asm_amd64.s:1337”]
[2020/08/14 23:18:26.039 +08:00] [INFO] [syncer.go:251] [“write save point”] [ts=418609373894410296]
[2020/08/14 23:18:26.041 +08:00] [INFO] [syncer.go:243] [“handleSuccess quit”]
[2020/08/14 23:18:26.041 +08:00] [ERROR] [server.go:270] [“syncer exited abnormal”] [error=“add to dsyncer failed: table not exist”] [errorVerbose=“table not exist\ngithub.com/pingcap/tidb-binlog/pkg/loader.init.ializers\
\t/home/jenkins/workspace/release_tidb_3.0/go/src/github.com/pingcap/tidb-binlog/pkg/loader/util.go:28\
runtime.main\
\t/usr/local/go/src/runtime/proc.go:188\
runtime.goexit\
\t/usr/local/go/src/runtime/asm_amd64.s:1337\
add to dsyncer failed”]
[2020/08/14 23:18:26.041 +08:00] [INFO] [util.go:66] [Exit] [name=syncer]
[2020/08/14 23:18:26.041 +08:00] [INFO] [server.go:406] [“begin to close drainer server”]
[2020/08/14 23:18:26.043 +08:00] [INFO] [server.go:371] [“has already update status”] [id=cs-tidb003:8249]
[2020/08/14 23:18:26.043 +08:00] [INFO] [server.go:410] [“commit status done”]
[2020/08/14 23:18:26.043 +08:00] [INFO] [collector.go:130] [“publishBinlogs quit”]
[2020/08/14 23:18:26.043 +08:00] [INFO] [pump.go:72] [“pump is closing”] [id=cs-tidb003:8250]
[2020/08/14 23:18:26.043 +08:00] [WARN] [merge.go:284] [“can’t read binlog from pump”] [“source id”=cs-tidb003:8250]
[2020/08/14 23:18:26.043 +08:00] [INFO] [util.go:66] [Exit] [name=heartbeat]
[2020/08/14 23:18:26.043 +08:00] [INFO] [pump.go:72] [“pump is closing”] [id=cs-tidb004:8250]
[2020/08/14 23:18:26.043 +08:00] [INFO] [util.go:66] [Exit] [name=collect]
[2020/08/14 23:18:26.043 +08:00] [INFO] [main.go:73] [“drainer exit”]
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