AHeise commented on code in PR #154:
URL:
https://github.com/apache/flink-connector-kafka/pull/154#discussion_r2029327404
##########
flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/sink/KafkaWriterStateSerializer.java:
##########
@@ -59,14 +61,20 @@ public KafkaWriterState deserialize(int version, byte[]
serialized) throws IOExc
try (final ByteArrayInputStream bais = new
ByteArrayInputStream(serialized);
final DataInputStream in = new DataInputStream(bais)) {
final String transactionalIdPrefix = in.readUTF();
+ int subtaskId = 0;
Review Comment:
It's a good point. I suggest to add a special variable UNKNOWN=-1 and
disallow using POOLING then. In that way, we can guide the user to safely
convert the checkpoint first to INCREMENTING and then POOLING.
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