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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/07/02 11:01:36 UTC

[GitHub] [flink] fsk119 opened a new pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

fsk119 opened a new pull request #12805:
URL: https://github.com/apache/flink/pull/12805


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   ## What is the purpose of the change
   
   *Currently users still can't use 'exactly-once' semantic in kafka table api. Therefore, we expose key `sink.semantic` and offer values `['exactly-once', 'at-least-once', 'none']` for users to use.*
   
   
   ## Brief change log
   
     - *Add option in KafkaOptions*
     - *Add validation for value of `sink.semantic`*
     - *Use parsed value of `sink.semantic` to build KafkaProducer*
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
   
     - *Added integration tests for new option `sink.semantic`*
     - *Added test when input invalid value for option `sink.semantic`*
    
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
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     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (**yes** / no)
     - If yes, how is the feature documented? (not applicable / **docs** / JavaDocs / not documented)
   


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] wuchong commented on a change in pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
wuchong commented on a change in pull request #12805:
URL: https://github.com/apache/flink/pull/12805#discussion_r451950734



##########
File path: flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/table/KafkaOptions.java
##########
@@ -222,8 +226,17 @@ private static void validateSinkSemantic(ReadableConfig tableOptions) {
 	// Utilities
 	// --------------------------------------------------------------------------------------------
 
-	public static String transformSemantic(String semantic){
-		return semantic.toUpperCase().replace('-', '_');
+	public static KafkaSemantic getSinkSemantic(String semantic){

Review comment:
       `SinkSemantic` or `KafkaSinkSemantic`? It maybe confusing that it also works for source.




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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] fsk119 commented on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
fsk119 commented on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-653839338


   CC @wuchong 


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] wuchong commented on a change in pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
wuchong commented on a change in pull request #12805:
URL: https://github.com/apache/flink/pull/12805#discussion_r450703944



##########
File path: flink-connectors/flink-connector-kafka-0.10/src/main/java/org/apache/flink/streaming/connectors/kafka/table/Kafka010DynamicTableFactory.java
##########
@@ -65,18 +74,31 @@ protected KafkaDynamicSinkBase createKafkaTableSink(
 			String topic,
 			Properties properties,
 			Optional<FlinkKafkaPartitioner<RowData>> partitioner,
-			EncodingFormat<SerializationSchema<RowData>> encodingFormat) {
+			EncodingFormat<SerializationSchema<RowData>> encodingFormat,
+			String semantic) {
 
 		return new Kafka010DynamicSink(
 			consumedDataType,
 			topic,
 			properties,
 			partitioner,
-			encodingFormat);
+			encodingFormat,
+			semantic);
 	}
 
 	@Override
 	public String factoryIdentifier() {
 		return IDENTIFIER;
 	}
+
+	@Override
+	public Set<ConfigOption<?>> optionalOptions() {
+		final Set<ConfigOption<?>> options = new HashSet<>();
+		options.add(PROPS_GROUP_ID);
+		options.add(SCAN_STARTUP_MODE);
+		options.add(SCAN_STARTUP_SPECIFIC_OFFSETS);
+		options.add(SCAN_STARTUP_TIMESTAMP_MILLIS);
+		options.add(SINK_PARTITIONER);
+		return options;

Review comment:
       remove sink semantic option.

##########
File path: flink-connectors/flink-connector-kafka-0.10/src/test/java/org/apache/flink/streaming/connectors/kafka/table/Kafka010DynamicTableFactoryTest.java
##########
@@ -82,12 +87,47 @@ protected KafkaDynamicSinkBase getExpectedSink(
 			String topic,
 			Properties properties,
 			Optional<FlinkKafkaPartitioner<RowData>> partitioner,
-			EncodingFormat<SerializationSchema<RowData>> encodingFormat) {
+			EncodingFormat<SerializationSchema<RowData>> encodingFormat,
+			String semantic) {
+		// we only support "at-least-semantic" for kafka-0.10 connector.
+		// if users use `sink.semantic` to select behaviour for kafka-0.10 connector,
+		// he/she will get validation error of unsupported option.
 		return new Kafka010DynamicSink(
 				consumedDataType,
 				topic,
 				properties,
 				partitioner,
-				encodingFormat);
+				encodingFormat,
+				"AT_LEAST_ONCE");
+	}
+
+	@Override
+	protected Map<String, String> getFullSinkOptions(){
+		Map<String, String> options = super.getFullSinkOptions();
+		options.remove("sink.semantic");
+		return options;
+	}
+
+	@Override
+	public void testInvalidSinkSemantic() {
+		ObjectIdentifier objectIdentifier = ObjectIdentifier.of(
+			"default",
+			"default",
+			"sinkTable");
+
+		final Map<String, String> modifiedOptions = getModifiedOptions(
+			getFullSinkOptions(),
+			options -> {
+				options.put("sink.semantic", "exactly-once");
+			});
+		final CatalogTable sinkTable = createKafkaSinkCatalogTable(modifiedOptions);
+
+		thrown.expect(ValidationException.class);

Review comment:
       Please check the exception message too. If the expected message is nested in the stack, you can use `org.apache.flink.core.testutils.FlinkMatchers#containsCause` util.




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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] wuchong closed pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
wuchong closed pull request #12805:
URL: https://github.com/apache/flink/pull/12805


   


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[GitHub] [flink] wuchong commented on a change in pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
wuchong commented on a change in pull request #12805:
URL: https://github.com/apache/flink/pull/12805#discussion_r449967255



##########
File path: flink-connectors/flink-connector-kafka-base/src/test/java/org/apache/flink/streaming/connectors/kafka/table/KafkaDynamicTableFactoryTestBase.java
##########
@@ -386,6 +411,7 @@ private CatalogTable createKafkaSinkCatalogTable(Map<String, String> options) {
 		tableOptions.put("properties.group.id", "dummy");
 		tableOptions.put("properties.bootstrap.servers", "dummy");
 		tableOptions.put("sink.partitioner", KafkaOptions.SINK_PARTITIONER_VALUE_FIXED);
+		tableOptions.put("sink.semantic", KafkaOptions.SINK_SEMANTIC_VALUE_AT_LEAST_ONCE);

Review comment:
       use exactly-once to verify the configuration works, because default value is at-least-once. 

##########
File path: docs/dev/table/connectors/kafka.md
##########
@@ -165,6 +165,14 @@ Connector Options
       </ul>
       </td>
     </tr>
+    <tr>
+      <td><h5>sink.semantic</h5></td>
+      <td>optional</td>
+      <td style="word-wrap: break-word;">at-least-once</td>
+      <td>String</td>
+      <td>Optional semantic when commit. Valid enumerationns are ['at-lease-once', 'exactly-once', 'none']. 
+          Only Kafka whose version greater than 1.0.0 support 'exactly-once' with checkpointing enabled.</td>

Review comment:
       ```suggestion
         <td>Defines the delivery semantic for the Kafka sink. Valid enumerationns are <code>'at-lease-once'</code>, <code>'exactly-once'</code> and <code>'none'</code>. <code>'kafka-0.10'</code> doesn't support this option. See <a href='#consistency-guarantees'>Consistency guarantees</a> for more details. </td>
   ```

##########
File path: docs/dev/table/connectors/kafka.md
##########
@@ -206,6 +214,8 @@ However, it will cause a lot of network connections between all the Flink instan
 ### Consistency guarantees
 
 By default, a Kafka sink ingests data with at-least-once guarantees into a Kafka topic if the query is executed with [checkpointing enabled]({% link dev/stream/state/checkpointing.md %}#enabling-and-configuring-checkpointing).
+With Kafka whose version is greater than 1.0.0, `sink.semantic` can provide exactly-once delivery guarantee. Whenever you write to Kafka using transactions, do not forget about setting the desired `isolation.level`
+(`read_committed` or `read_uncommitted` - latter one is the default value) for any application consuming records from Kafka.

Review comment:
       ```suggestion
   
   With Flink's checkpointing enabled, the `kafka` and `kafka-0.11` connectors can provide exactly-once delivery guarantees.
   
   Besides enabling Flink's checkpointing, you can also choose three different modes of operating chosen by passing appropriate `sink.semantic` option:
   
    * `NONE`: Flink will not guarantee anything. Produced records can be lost or they can be duplicated.
    * `AT_LEAST_ONCE` (default setting): This guarantees that no records will be lost (although they can be duplicated).
    * `EXACTLY_ONCE`: Kafka transactions will be used to provide exactly-once semantic. Whenever you write
    to Kafka using transactions, do not forget about setting desired `isolation.level` (`read_committed`
    or `read_uncommitted` - the latter one is the default value) for any application consuming records
    from Kafka.
   
   Please refer to [Kafka documentation]({% link dev/connectors/kafka.md %}#kafka-producers-and-fault-tolerance) for more caveats about delivery guarantees.
   ```

##########
File path: flink-connectors/flink-connector-kafka-0.11/src/main/java/org/apache/flink/streaming/connectors/kafka/table/Kafka011DynamicSink.java
##########
@@ -42,26 +44,31 @@ public Kafka011DynamicSink(
 			String topic,
 			Properties properties,
 			Optional<FlinkKafkaPartitioner<RowData>> partitioner,
-			EncodingFormat<SerializationSchema<RowData>> encodingFormat) {
+			EncodingFormat<SerializationSchema<RowData>> encodingFormat,
+			String semantic) {
 		super(
 				consumedDataType,
 				topic,
 				properties,
 				partitioner,
-				encodingFormat);
+				encodingFormat,
+				semantic);
 	}
 
 	@Override
 	protected SinkFunction<RowData> createKafkaProducer(
 			String topic,
 			Properties properties,
 			SerializationSchema<RowData> serializationSchema,
-			Optional<FlinkKafkaPartitioner<RowData>> partitioner) {
+			Optional<FlinkKafkaPartitioner<RowData>> partitioner,
+			String semantic) {
 		return new FlinkKafkaProducer011<>(
 				topic,
-				serializationSchema,
+				new KeyedSerializationSchemaWrapper<>(serializationSchema),
 				properties,
-				partitioner);
+				partitioner,
+				getSemantic(semantic),

Review comment:
       I suggest to move this logic into `KafkaOptions` to avoid duplicate code. You can have a table level enum class `SinkSemantic`. And simply call `FlinkKafkaProducer.Semantic.valueOf(semantic.name())` here.

##########
File path: flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/table/KafkaOptions.java
##########
@@ -191,6 +208,21 @@ private static void validateSinkPartitioner(ReadableConfig tableOptions) {
 				});
 	}
 
+	private static void validateSinkSemantic(ReadableConfig tableOptions, String kafkaVersion) {
+		tableOptions.getOptional(SINK_SEMANTIC).ifPresent(semantic -> {
+			if (!SINK_SEMANTIC_ENUMS.contains(semantic)){
+				throw new ValidationException(
+					String.format("Unsupported value '%s' for '%s'. Supported values are ['at-least-once', 'exactly-once', 'none'].",
+						semantic, SINK_SEMANTIC.key()));
+			}
+
+			if (kafkaVersion.equals("kafka-0.10") && (!SINK_SEMANTIC_VALUE_AT_LEAST_ONCE.equals(semantic))){

Review comment:
       This is indeed what we should avoid. A base class shouldn't depends on specific connector implementation. We should move this special logic into `Kafka010DynamicTableFactory`. 
   
   A simple way to disallow this option in kafka-0.10 is override `optionalOptions()` and remove `SINK_SEMANTIC` from it. 




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[GitHub] [flink] wuchong commented on a change in pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
wuchong commented on a change in pull request #12805:
URL: https://github.com/apache/flink/pull/12805#discussion_r451951070



##########
File path: docs/dev/table/connectors/kafka.md
##########
@@ -207,6 +214,19 @@ However, it will cause a lot of network connections between all the Flink instan
 
 By default, a Kafka sink ingests data with at-least-once guarantees into a Kafka topic if the query is executed with [checkpointing enabled]({% link dev/stream/state/checkpointing.md %}#enabling-and-configuring-checkpointing).
 
+With Flink's checkpointing enabled, the `kafka` and `kafka-0.11` connectors can provide exactly-once delivery guarantees.
+
+Besides enabling Flink's checkpointing, you can also choose three different modes of operating chosen by passing appropriate `sink.semantic` option:
+
+ * `NONE`: Flink will not guarantee anything. Produced records can be lost or they can be duplicated.
+ * `AT_LEAST_ONCE` (default setting): This guarantees that no records will be lost (although they can be duplicated).

Review comment:
       ```suggestion
    * `at-least-once` (default setting): This guarantees that no records will be lost (although they can be duplicated).
   ```

##########
File path: docs/dev/table/connectors/kafka.md
##########
@@ -207,6 +214,19 @@ However, it will cause a lot of network connections between all the Flink instan
 
 By default, a Kafka sink ingests data with at-least-once guarantees into a Kafka topic if the query is executed with [checkpointing enabled]({% link dev/stream/state/checkpointing.md %}#enabling-and-configuring-checkpointing).
 
+With Flink's checkpointing enabled, the `kafka` and `kafka-0.11` connectors can provide exactly-once delivery guarantees.
+
+Besides enabling Flink's checkpointing, you can also choose three different modes of operating chosen by passing appropriate `sink.semantic` option:
+
+ * `NONE`: Flink will not guarantee anything. Produced records can be lost or they can be duplicated.
+ * `AT_LEAST_ONCE` (default setting): This guarantees that no records will be lost (although they can be duplicated).
+ * `EXACTLY_ONCE`: Kafka transactions will be used to provide exactly-once semantic. Whenever you write

Review comment:
       ```suggestion
    * `exactly-once`: Kafka transactions will be used to provide exactly-once semantic. Whenever you write
   ```

##########
File path: docs/dev/table/connectors/kafka.md
##########
@@ -207,6 +214,19 @@ However, it will cause a lot of network connections between all the Flink instan
 
 By default, a Kafka sink ingests data with at-least-once guarantees into a Kafka topic if the query is executed with [checkpointing enabled]({% link dev/stream/state/checkpointing.md %}#enabling-and-configuring-checkpointing).
 
+With Flink's checkpointing enabled, the `kafka` and `kafka-0.11` connectors can provide exactly-once delivery guarantees.
+
+Besides enabling Flink's checkpointing, you can also choose three different modes of operating chosen by passing appropriate `sink.semantic` option:
+
+ * `NONE`: Flink will not guarantee anything. Produced records can be lost or they can be duplicated.

Review comment:
       ```suggestion
    * `none`: Flink will not guarantee anything. Produced records can be lost or they can be duplicated.
   ```

##########
File path: flink-connectors/flink-connector-kafka-0.10/src/main/java/org/apache/flink/streaming/connectors/kafka/table/Kafka010DynamicTableFactory.java
##########
@@ -65,18 +69,27 @@ protected KafkaDynamicSinkBase createKafkaTableSink(
 			String topic,
 			Properties properties,
 			Optional<FlinkKafkaPartitioner<RowData>> partitioner,
-			EncodingFormat<SerializationSchema<RowData>> encodingFormat) {
+			EncodingFormat<SerializationSchema<RowData>> encodingFormat,
+			KafkaSemantic semantic) {
 
 		return new Kafka010DynamicSink(
 			consumedDataType,
 			topic,
 			properties,
 			partitioner,
-			encodingFormat);
+			encodingFormat,
+			semantic);
 	}
 
 	@Override
 	public String factoryIdentifier() {
 		return IDENTIFIER;
 	}
+
+	@Override
+	public Set<ConfigOption<?>> optionalOptions() {
+		final Set<ConfigOption<?>> options = super.optionalOptions();
+		options.remove(SINK_SEMANTIC);

Review comment:
       Add a comment on this to explain why we remove sink semantic in 0.10




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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] fsk119 commented on a change in pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
fsk119 commented on a change in pull request #12805:
URL: https://github.com/apache/flink/pull/12805#discussion_r450119872



##########
File path: flink-connectors/flink-connector-kafka-0.11/src/main/java/org/apache/flink/streaming/connectors/kafka/table/Kafka011DynamicSink.java
##########
@@ -42,26 +44,31 @@ public Kafka011DynamicSink(
 			String topic,
 			Properties properties,
 			Optional<FlinkKafkaPartitioner<RowData>> partitioner,
-			EncodingFormat<SerializationSchema<RowData>> encodingFormat) {
+			EncodingFormat<SerializationSchema<RowData>> encodingFormat,
+			String semantic) {
 		super(
 				consumedDataType,
 				topic,
 				properties,
 				partitioner,
-				encodingFormat);
+				encodingFormat,
+				semantic);
 	}
 
 	@Override
 	protected SinkFunction<RowData> createKafkaProducer(
 			String topic,
 			Properties properties,
 			SerializationSchema<RowData> serializationSchema,
-			Optional<FlinkKafkaPartitioner<RowData>> partitioner) {
+			Optional<FlinkKafkaPartitioner<RowData>> partitioner,
+			String semantic) {
 		return new FlinkKafkaProducer011<>(
 				topic,
-				serializationSchema,
+				new KeyedSerializationSchemaWrapper<>(serializationSchema),
 				properties,
-				partitioner);
+				partitioner,
+				getSemantic(semantic),

Review comment:
       I have already moved getSemantic logic from KafkaDynamicSink. However, I just add  a method named `transformSemantic` to resolve the gap between KafaProducer.Semantic and value of 'sink.semantic'. This method will 
   transform input of 'sink.semantic' and replace '-' with '_';




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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] fsk119 commented on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
fsk119 commented on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-653401122


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[GitHub] [flink] flinkbot commented on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652940254


   Thanks a lot for your contribution to the Apache Flink project. I'm the @flinkbot. I help the community
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   ## Automated Checks
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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot commented on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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[GitHub] [flink] fsk119 removed a comment on pull request #12805: [Flink-14356][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/flink/pull/12805#issuecomment-653401122


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[GitHub] [flink] flinkbot edited a comment on pull request #12805: [FLINK-15221][table api]support fault-tolerant semantic for kafka table api

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12805:
URL: https://github.com/apache/flink/pull/12805#issuecomment-652943981


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