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https://issues.apache.org/jira/browse/FLINK-39916?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

XiaodongHuan updated FLINK-39916:
---------------------------------
    Description: 
In MySqlDataSourceFactory, the exception message uses "{}" as a placeholder 
inside String.format(...).

Current code:

throw new IllegalArgumentException(
        String.format(
                "Only \"snapshot\" of MySQLDataSource StartupOption is 
supported in BATCH pipeline, but actual MySQLDataSource StartupOption is {}.",
                startupOptions.startupMode));

Expected:

The actual startup mode should be included in the exception message.

Suggested fix:

Replace "{}" with "%s":

File:
flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/main/java/org/apache/flink/cdc/connectors/mysql/factory/MySqlDataSourceFactory.java

Additional cleanup:

The same file also contains an unused constant:

private static final String DOT_PLACEHOLDER = "_$dot_placeholder$_";

This constant is not referenced anywhere in MySqlDataSourceFactory.java and can 
be safely removed as part of the same small cleanup.

  was:
In MySqlDataSourceFactory, the exception message uses "{}" as a placeholder 
inside String.format(...).

Current code:

throw new IllegalArgumentException(
        String.format(
                "Only \"snapshot\" of MySQLDataSource StartupOption is 
supported in BATCH pipeline, but actual MySQLDataSource StartupOption is {}.",
                startupOptions.startupMode));

Expected:

The actual startup mode should be included in the exception message.

Suggested fix:

Replace "{}" with "%s":

File:
flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/main/java/org/apache/flink/cdc/connectors/mysql/factory/MySqlDataSourceFactory.java


> Incorrect placeholder used in MySqlDataSourceFactory exception message
> ----------------------------------------------------------------------
>
>                 Key: FLINK-39916
>                 URL: https://issues.apache.org/jira/browse/FLINK-39916
>             Project: Flink
>          Issue Type: Bug
>          Components: Flink CDC
>    Affects Versions: cdc-3.5.0
>            Reporter: XiaodongHuan
>            Priority: Minor
>              Labels: pull-request-available
>
> In MySqlDataSourceFactory, the exception message uses "{}" as a placeholder 
> inside String.format(...).
> Current code:
> throw new IllegalArgumentException(
>         String.format(
>                 "Only \"snapshot\" of MySQLDataSource StartupOption is 
> supported in BATCH pipeline, but actual MySQLDataSource StartupOption is {}.",
>                 startupOptions.startupMode));
> Expected:
> The actual startup mode should be included in the exception message.
> Suggested fix:
> Replace "{}" with "%s":
> File:
> flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/main/java/org/apache/flink/cdc/connectors/mysql/factory/MySqlDataSourceFactory.java
> Additional cleanup:
> The same file also contains an unused constant:
> private static final String DOT_PLACEHOLDER = "_$dot_placeholder$_";
> This constant is not referenced anywhere in MySqlDataSourceFactory.java and 
> can be safely removed as part of the same small cleanup.



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