ahmedabu98 commented on code in PR #36045:
URL: https://github.com/apache/beam/pull/36045#discussion_r2337763633


##########
sdks/java/io/jdbc/src/main/java/org/apache/beam/sdk/io/jdbc/providers/ReadFromMySqlSchemaTransformProvider.java:
##########
@@ -43,4 +51,31 @@ public String description() {
   protected String jdbcType() {
     return MYSQL;
   }
+
+  @Override
+  public @UnknownKeyFor @NonNull @Initialized SchemaTransform from(
+      JdbcReadSchemaTransformConfiguration configuration) {
+    String jdbcType = configuration.getJdbcType();
+    if (jdbcType != null && !jdbcType.isEmpty() && 
!jdbcType.equals(jdbcType())) {
+      throw new IllegalArgumentException(
+          String.format("Wrong JDBC type. Expected '%s' but got '%s'", 
jdbcType(), jdbcType));
+    }
+
+    Integer fetchSize = configuration.getFetchSize();
+    if (fetchSize != null
+        && fetchSize > 0
+        && configuration.getJdbcUrl() != null
+        && !configuration.getJdbcUrl().contains("useCursorFetch=true")) {
+      LOG.warn(
+          "The fetchSize option is ignored. It is required to set 
useCursorFetch=true"
+              + " in the JDBC URL when using fetchSize for MySQL");

Review Comment:
   Consider failing instead of just logging a warning?



##########
sdks/java/io/jdbc/src/main/java/org/apache/beam/sdk/io/jdbc/providers/ReadFromMySqlSchemaTransformProvider.java:
##########
@@ -43,4 +51,31 @@ public String description() {
   protected String jdbcType() {
     return MYSQL;
   }
+
+  @Override
+  public @UnknownKeyFor @NonNull @Initialized SchemaTransform from(
+      JdbcReadSchemaTransformConfiguration configuration) {
+    String jdbcType = configuration.getJdbcType();
+    if (jdbcType != null && !jdbcType.isEmpty() && 
!jdbcType.equals(jdbcType())) {
+      throw new IllegalArgumentException(
+          String.format("Wrong JDBC type. Expected '%s' but got '%s'", 
jdbcType(), jdbcType));
+    }

Review Comment:
   Wondering if we should just be ignoring the `jdbcType` parameter. It seems 
irrelevant if users specifically choose MySQL using SchemaTransform/Managed API



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