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】：v1.0.4
- 【问题描述】：
M新添加的任务，无法同步，删除/data1（部署之后按实例生成的） 目录之后， flush local meta: open /data1/dm_worker/relay_log/xx no such file or directory
[2020/03/23 17:37:14.931 +08:00] [ERROR] [relay.go:650] [“flush checkpoint”] [component=“relay log”] [error=“[code=30006:class=relay-unit:scope=internal:level=high] flushlocal meta: open /data1/dm_worker/relay_log/a8cd9d3c-8a73-11e8-a93f-00163e08df50.000001/relay.meta124188106: no such file or directory”] [errorVerbose=“[code=30006:class=relay-unit:scope=internal:level=high] flush local meta: open /data1/dm_worker/relay_log/a8cd9d3c-8a73-11e8-a93f-00163e08df50.000001/relay.meta124188106: no such file or directory
github.com/pingcap/dm/pkg/terror.(*Error).Delegate
\t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/pkg/terror/terror.go:267
github.com/pingcap/dm/relay.(*LocalMeta).doFlush
\t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/relay/meta.go:246
github.com/pingcap/dm/relay.(*LocalMeta).Flush
\t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/relay/meta.go:227
github.com/pingcap/dm/relay.(*Relay).stopSync
\t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/relay/relay.go:649
github.com/pingcap/dm/relay.(*Relay).Close
\t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/relay/relay.go:670
github.com/pingcap/dm/dm/worker.(*realRelayHolder).Close
\t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/dm/worker/relay.go:158
github.com/pingcap/dm/dm/worker.(*Worker).Close
\t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/dm/worker/worker.go:215
github.com/pingcap/dm/dm/worker.(*Server).Close
\t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/dm/worker/server.go:143
main.main.func2
\t/home/jenkins/agent/workspace/build_dm_master/go/src/github.com/pingcap/dm/cmd/dm-worker/main.go:73
runtime.goexit
\t/usr/local/go/src/runti
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