autumnust commented on a change in pull request #2721: Add offset look-back
option in Kafka consumer
URL: https://github.com/apache/incubator-gobblin/pull/2721#discussion_r317379980
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File path:
gobblin-modules/gobblin-kafka-common/src/main/java/org/apache/gobblin/source/extractor/extract/kafka/KafkaSource.java
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@@ -451,7 +459,21 @@ private WorkUnit
getWorkUnitForTopicPartition(KafkaPartition partition, SourceSt
LOG.warn(
offsetNotFoundMsg + "This partition will start from the earliest
offset: " + offsets.getEarliestOffset());
offsets.startAtEarliestOffset();
- } else {
+ } else if (offsetOption.equals(OFFSET_LOOKBACK)) {
+ long lookbackOffsetRange =
state.getPropAsLong("kafka.offset.lookback", 0L);
+ long offset = offsets.getLatestOffset() - lookbackOffsetRange;
+ LOG.warn(offsetNotFoundMsg + "This partition will start from
latest-lookback [ " + offsets.getLatestOffset() + " - " + lookbackOffsetRange +
" ] start offset: " + offset);
+ try {
+ offsets.startAt(offset);
+ } catch (StartOffsetOutOfRangeException e) {
+ String offsetOutOfRangeMsg = String.format(
+ "Start offset for partition %s is out of range. Start offset
= %d, earliest offset = %d, latest offset = %d.",
+ partition, offsets.getStartOffset(),
offsets.getEarliestOffset(), offsets.getLatestOffset());
+ LOG.warn(offsetOutOfRangeMsg + "This partition will start from the
latest offset: " + offsets.getLatestOffset());
Review comment:
In `KafkaSource` there's a configuration `RESET_ON_OFFSET_OUT_OF_RANGE`
which configures a specific behavior when offset is out of bound. Let's use
that configuration here to determine the behavior for consistency.
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