Github user rmetzger commented on a diff in the pull request:
https://github.com/apache/flink/pull/2687#discussion_r105621449
--- Diff:
flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumerBase.java
---
@@ -558,11 +629,31 @@ protected static void
initializeSubscribedPartitionsToStartOffsets(
List<KafkaTopicPartition> kafkaTopicPartitions,
int indexOfThisSubtask,
int numParallelSubtasks,
- StartupMode startupMode) {
+ StartupMode startupMode,
+ Map<KafkaTopicPartition, Long> specificStartupOffsets) {
for (int i = 0; i < kafkaTopicPartitions.size(); i++) {
if (i % numParallelSubtasks == indexOfThisSubtask) {
-
subscribedPartitionsToStartOffsets.put(kafkaTopicPartitions.get(i),
startupMode.getStateSentinel());
+ if (startupMode !=
StartupMode.SPECIFIC_OFFSETS) {
+
subscribedPartitionsToStartOffsets.put(kafkaTopicPartitions.get(i),
startupMode.getStateSentinel());
+ } else {
+ if (specificStartupOffsets == null) {
+ throw new
IllegalArgumentException(
+ "Startup mode for the
consumer set to " + StartupMode.SPECIFIC_OFFSETS +
+ ", but no
specific offsets were specified");
+ }
+
+ KafkaTopicPartition partition =
kafkaTopicPartitions.get(i);
+
+ Long specificOffset =
specificStartupOffsets.get(partition);
+ if (specificOffset != null) {
+ // since the specified offsets
represent the next record to read, we subtract
+ // it by one so that the
initial state of the consumer will be correct
+
subscribedPartitionsToStartOffsets.put(partition, specificOffset - 1);
--- End diff --
What happens if the user sets the offset to 0 because they assume that's
the start? Will it fail, or fallback to auto offset reset?
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