Github user hmcl commented on a diff in the pull request:
https://github.com/apache/storm/pull/2465#discussion_r157610099
--- Diff:
external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpout.java
---
@@ -225,6 +237,23 @@ private long doSeek(TopicPartition tp,
OffsetAndMetadata committedOffset) {
}
}
+ /**
+ * Checks If {@link OffsetAndMetadata} was committed by this topology,
either by this or another spout instance.
+ * This info is used to decide if {@link FirstPollOffsetStrategy}
should be applied
+ *
+ * @param committedOffset {@link OffsetAndMetadata} info committed to
Kafka
+ * @return true if this topology committed this {@link
OffsetAndMetadata}, false otherwise
+ */
+ private boolean isOffsetCommittedByThisTopology(OffsetAndMetadata
committedOffset) {
+ try {
+ return committedOffset != null &&
JSON_MAPPER.readValue(committedOffset.metadata(), KafkaSpoutMessageId.class)
--- End diff --
It returns false if it throws exception when attempting to deserialize
OffsetAndMetadata committed using a previous version of Storm.
---
