[docs] Add MySQL HA cluster support explanation

docs/content/connectors/mysql-cdc.md

@@ -281,6 +281,27 @@ Incremental snapshot reading provides the ability to perform checkpoint in chunk
 
 The MySQL CDC source use **incremental snapshot algorithm**, which avoid acquiring global read lock (FLUSH TABLES WITH READ LOCK) and thus doesn't need `RELOAD` permission.
 
+#### MySQL High Availability Support
+
+The ```mysql-cdc``` connector offers high availability of MySQL high available cluster by using the [GTID](https://dev.mysql.com/doc/refman/5.7/en/replication-gtids-concepts.html) information. To obtain the high availability, the MySQL cluster need enable the GTID mode, the GTID mode in your mysql config file should contain following settings:
+
+```yaml
+gtid_mode = on
+enforce_gtid_consistency = on
+```
+
+If the monitored MySQL server address contains slave instance, you need set following settings to the MySQL conf file. The setting ```log-slave-updates = 1``` enables the slave instance to also write the data that synchronized from master to its binlog, this makes sure that the ```mysql-cdc``` connector can consume entire data from the slave instance.
+
+```yaml
+gtid_mode = on
+enforce_gtid_consistency = on
+log-slave-updates = 1
+```
+
+After the server you monitored fails in MySQL cluster, you only need to change the monitored server address to other available server and then restart the job from the latest checkpoint/savepoint, the job will restore from the checkpoint/savepoint and won't miss any records.
+
+It's recommended to configure a DNS(Domain Name Service) or VIP(Virtual IP Address) for your MySQL cluster, using the DNS or VIP address for ```mysql-cdc``` connector, the DNS or VIP would automatically route the network request to the active MySQL server. In this way, you don't need to modify the address and restart your pipeline anymore.
+
 #### How Incremental Snapshot Reading works
 
 When the MySQL CDC source is started, it reads snapshot of table parallelly and then reads binlog of table with single parallelism.