Jinlong Liu comments

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                                            Jinlong Liu

lightning import failed when tikv net delay 100ms

![21599112696_ pic_hd](https://user-images.githubusercontent.com/50897894/92077852-d1243880-edef-11ea-8726-935aa5601218.jpg)

lightning import failed when tikv net delay 100ms

Would this design be better When the majority copy is successfully imported，then lightning return success prevent the remote center network from affecting the import speed。

Syncer(DM): alerting enhancement for `DM sync process exists with error`

``` - alert: DM_sync_process_exists_with_error expr: changes(dm_syncer_exit_with_error_count[1m]) > 0 labels: env: ENV_LABELS_ENV level: critical expr: changes(dm_syncer_exit_with_error_count[1m]) > 0 annotations: description: 'cluster: ENV_LABELS_ENV, instance: {{ $labels.instance }}, task: {{ $labels.task }}, values:...

With a tls enabled cluster got bad certificate error

New deployed cluster and enable TLS can also reproduce

[Dynamic Region] Fix some large regions can't split

/cc @5kbpers

[Dynamic Region] Some large regions did not split due to split check did not run after update region split config online

Can i try to fix it？