compatibility with Kafka older than 2.6

Author: jerrinot

connector/src/main/java/io/questdb/kafka/QuestDBSinkTask.java

@@ -16,6 +16,7 @@
 import org.apache.kafka.connect.data.*;
 import org.apache.kafka.connect.errors.ConnectException;
 import org.apache.kafka.connect.errors.RetriableException;
+import org.apache.kafka.connect.sink.ErrantRecordReporter;
 import org.apache.kafka.connect.sink.SinkRecord;
 import org.apache.kafka.connect.sink.SinkTask;
 import org.slf4j.Logger;
@@ -50,6 +51,7 @@ public final class QuestDBSinkTask extends SinkTask {
     private int pendingRows;
     private final FlushConfig flushConfig = new FlushConfig();
     private final ObjList<SinkRecord> inflightSinkRecords = new ObjList<>();
+    private ErrantRecordReporter reporter;
 
     @Override
     public String version() {
@@ -88,6 +90,12 @@ public void start(Map<String, String> map) {
         this.allowedLag = config.getAllowedLag();
         this.nextFlushNanos = System.nanoTime() + flushConfig.autoFlushNanos;
         this.recordToTable = Templating.newTableTableFn(config.getTable());
+        try {
+            reporter = context.errantRecordReporter();
+        } catch (NoSuchMethodError | NoClassDefFoundError e) {
+            // Kafka older than 2.6
+            reporter = null;
+        }
     }
 
     private Sender createRawSender() {
@@ -247,7 +255,7 @@ private void onTcpSenderException(Exception e) {
 
     private void onHttpSenderException(Exception e) {
         closeSenderSilently();
-        if (e.getMessage() != null && e.getMessage().contains("error in line")) { // hack to detect data parsing errors
+        if (reporter != null & e.getMessage() != null && e.getMessage().contains("error in line")) { // hack to detect data parsing errors
             // ok, we have a parsing error, let's try to send records one by one to find the problematic record
             // and we will report it to the error handler. the rest of the records will make it to QuestDB
             sender = createSender();

connector/src/test/java/io/questdb/kafka/QuestDBSinkConnectorEmbeddedTest.java

@@ -293,6 +293,36 @@ public void testDeadLetterQueue_badColumnType() {
 
     }
 
+    @Test
+    public void testbadColumnType_noDLQ() {
+        connect.kafka().createTopic(topicName, 1);
+        Map<String, String> props = ConnectTestUtils.baseConnectorProps(questDBContainer, topicName, true);
+        props.put("value.converter.schemas.enable", "false");
+        connect.configureConnector(ConnectTestUtils.CONNECTOR_NAME, props);
+        ConnectTestUtils.assertConnectorTaskRunningEventually(connect);
+
+        QuestDBUtils.assertSql(
+                "{\"ddl\":\"OK\"}",
+                "create table " + topicName + " (firstname string, lastname string, age int, id uuid, ts timestamp) timestamp(ts) partition by day wal",
+                httpPort,
+                QuestDBUtils.Endpoint.EXEC);
+
+        String goodRecordA = "{\"firstname\":\"John\",\"lastname\":\"Doe\",\"age\":42,\"id\":\"ad956a45-a55b-441e-b80d-023a2bf5d041\"}";
+        String goodRecordB = "{\"firstname\":\"John\",\"lastname\":\"Doe\",\"age\":42,\"id\":\"ad956a45-a55b-441e-b80d-023a2bf5d042\"}";
+        String goodRecordC = "{\"firstname\":\"John\",\"lastname\":\"Doe\",\"age\":42,\"id\":\"ad956a45-a55b-441e-b80d-023a2bf5d043\"}";
+        String badRecordA = "{\"firstname\":\"John\",\"lastname\":\"Doe\",\"age\":42,\"id\":\"Invalid UUID\"}";
+        String badRecordB = "{\"firstname\":\"John\",\"lastname\":\"Doe\",\"age\":\"not a number\",\"id\":\"ad956a45-a55b-441e-b80d-023a2bf5d041\"}";
+
+        // interleave good and bad records
+        connect.kafka().produce(topicName, "key", goodRecordA);
+        connect.kafka().produce(topicName, "key", badRecordA);
+        connect.kafka().produce(topicName, "key", goodRecordB);
+        connect.kafka().produce(topicName, "key", badRecordB);
+        connect.kafka().produce(topicName, "key", goodRecordC);
+
+        ConnectTestUtils.assertConnectorTaskStateEventually(connect, AbstractStatus.State.FAILED);
+    }
+
     @ParameterizedTest
     @ValueSource(booleans = {true, false})
     public void testSymbol(boolean useHttp) {