[doc] Add docs for close idle readers feature. (#2208)

* [doc] Add docs for close idle readers feature

docs/content/connectors/mongodb-cdc(ZH).md

@@ -261,6 +261,13 @@ upstart 流需要一个唯一的密钥，所以我们必须声明 `_id` 作为
       <td>Integer</td>
       <td>增量快照的区块大小 mb。</td>
     </tr>
+    <tr>
+      <td>scan.incremental.close-idle-reader.enabled</td>
+      <td>optional</td>
+      <td style="word-wrap: break-word;">false</td>
+      <td>Boolean</td>
+      <td>是否在快照结束后关闭空闲的 Reader。 此特性需要 flink 版本大于等于 1.14 并且 'execution.checkpointing.checkpoints-after-tasks-finish.enabled' 需要设置为 true。</td>
+    </tr>
     </tbody>
 </table>
 </div>

docs/content/connectors/mongodb-cdc.md

@@ -261,6 +261,13 @@ Connector Options
       <td>Integer</td>
       <td>The chunk size mb of incremental snapshot.</td>
     </tr>
+    <tr>
+      <td>scan.incremental.close-idle-reader.enabled</td>
+      <td>optional</td>
+      <td style="word-wrap: break-word;">false</td>
+      <td>Boolean</td>
+      <td>Whether to close idle readers at the end of the snapshot phase. The flink version is required to be greater than or equal to 1.14 when 'execution.checkpointing.checkpoints-after-tasks-finish.enabled' is set to true.</td>
+    </tr>
     </tbody>
 </table>
 </div>

docs/content/connectors/mysql-cdc(ZH).md

@@ -317,6 +317,13 @@ Flink SQL> SELECT * FROM orders;
           For example: <code>'debezium.snapshot.mode' = 'never'</code>.
           查看更多关于 <a href="https://debezium.io/documentation/reference/1.6/connectors/mysql.html#mysql-connector-properties"> Debezium 的  MySQL 连接器属性</a></td> 
     </tr>
+    <tr>
+      <td>scan.incremental.close-idle-reader.enabled</td>
+      <td>optional</td>
+      <td style="word-wrap: break-word;">false</td>
+      <td>Boolean</td>
+      <td>是否在快照结束后关闭空闲的 Reader。 此特性需要 flink 版本大于等于 1.14 并且 'execution.checkpointing.checkpoints-after-tasks-finish.enabled' 需要设置为 true。</td>
+    </tr>
     </tbody>
 </table>
 </div>

docs/content/connectors/mysql-cdc.md

@@ -320,6 +320,13 @@ During a snapshot operation, the connector will query each included table to pro
           For example: <code>'debezium.snapshot.mode' = 'never'</code>.
           See more about the <a href="https://debezium.io/documentation/reference/1.6/connectors/mysql.html#mysql-connector-properties">Debezium's MySQL Connector properties</a></td> 
     </tr>
+    <tr>
+      <td>scan.incremental.close-idle-reader.enabled</td>
+      <td>optional</td>
+      <td style="word-wrap: break-word;">false</td>
+      <td>Boolean</td>
+      <td>Whether to close idle readers at the end of the snapshot phase. The flink version is required to be greater than or equal to 1.14 when 'execution.checkpointing.checkpoints-after-tasks-finish.enabled' is set to true.</td>
+    </tr>
     </tbody>
 </table>
 </div>

docs/content/connectors/oracle-cdc.md

@@ -356,7 +356,14 @@ Connector Options
       <td>Pass-through Debezium's properties to Debezium Embedded Engine which is used to capture data changes from Oracle server.
           For example: <code>'debezium.snapshot.mode' = 'never'</code>.
           See more about the <a href="https://debezium.io/documentation/reference/1.6/connectors/oracle.html#oracle-connector-properties">Debezium's Oracle Connector properties</a></td> 
-     </tr>
+    </tr>
+    <tr>
+      <td>scan.incremental.close-idle-reader.enabled</td>
+      <td>optional</td>
+      <td style="word-wrap: break-word;">false</td>
+      <td>Boolean</td>
+      <td>Whether to close idle readers at the end of the snapshot phase. The flink version is required to be greater than or equal to 1.14 when 'execution.checkpointing.checkpoints-after-tasks-finish.enabled' is set to true.</td>
+    </tr>
     </tbody>
 </table>    
 </div>

docs/content/connectors/sqlserver-cdc.md

@@ -199,7 +199,14 @@ Connector Options
       <td>Pass-through Debezium's properties to Debezium Embedded Engine which is used to capture data changes from SQLServer.
           For example: <code>'debezium.snapshot.mode' = 'initial_only'</code>.
           See more about the <a href="https://debezium.io/documentation/reference/1.6/connectors/sqlserver.html#sqlserver-required-connector-configuration-properties">Debezium's SQLServer Connector properties</a></td> 
-    </tr>   
+    </tr>
+    <tr>
+      <td>scan.incremental.close-idle-reader.enabled</td>
+      <td>optional</td>
+      <td style="word-wrap: break-word;">false</td>
+      <td>Boolean</td>
+      <td>Whether to close idle readers at the end of the snapshot phase. The flink version is required to be greater than or equal to 1.14 when 'execution.checkpointing.checkpoints-after-tasks-finish.enabled' is set to true.</td>
+    </tr>
     </tbody>
 </table>    
 </div>