Rückbau auf einen Consumer, der in `onPartitionsRevoked()` immer committed

[demos/kafka/training] / src / main / java / de / juplo / kafka / ApplicationRebalanceListener.java

diff --git a/src/main/java/de/juplo/kafka/ApplicationRebalanceListener.java b/src/main/java/de/juplo/kafka/ApplicationRebalanceListener.java
index 6d3850f..eef0d00 100644 (file)
--- a/src/main/java/de/juplo/kafka/ApplicationRebalanceListener.java
+++ b/src/main/java/de/juplo/kafka/ApplicationRebalanceListener.java
@@ -2,12 +2,10 @@ package de.juplo.kafka;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.Consumer;
 import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
 import org.apache.kafka.common.TopicPartition;
 
-import java.time.Clock;
-import java.time.Duration;
-import java.time.Instant;
 import java.util.*;
 
 
@@ -19,6 +17,7 @@ public class ApplicationRebalanceListener implements ConsumerRebalanceListener
   private final AdderResults adderResults;
   private final StateRepository stateRepository;
   private final String id;
+  private final Consumer consumer;
 
   private final Set<Integer> partitions = new HashSet<>();
 
@@ -51,6 +50,16 @@ public class ApplicationRebalanceListener implements ConsumerRebalanceListener
   @Override
   public void onPartitionsRevoked(Collection<TopicPartition> partitions)
   {
+    log.info("{} - Commiting offsets for all previously assigned partitions", id);
+    try
+    {
+      consumer.commitSync();
+    }
+    catch (Exception e)
+    {
+      log.warn("{} - Could not commit offsets in onPartitionsRevoked():", id, e);
+    }
+
     partitions.forEach(tp ->
     {
       Integer partition = tp.partition();