kirktrue commented on code in PR #17353:
URL: https://github.com/apache/kafka/pull/17353#discussion_r1805613969
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java:
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@@ -1072,12 +1073,10 @@ public Map<TopicPartition, OffsetAndTimestamp>
offsetsForTimes(Map<TopicPartitio
}
try {
- return applicationEventHandler.addAndGet(listOffsetsEvent)
- .entrySet()
- .stream()
- .collect(Collectors.toMap(
- Map.Entry::getKey,
- entry -> entry.getValue().buildOffsetAndTimestamp()));
+ Map<TopicPartition, OffsetAndTimestampInternal> offsets =
applicationEventHandler.addAndGet(listOffsetsEvent);
+ Map<TopicPartition, OffsetAndTimestamp> results = new
HashMap<>(offsets.size());
+ offsets.forEach((k, v) -> results.put(k, v != null ?
v.buildOffsetAndTimestamp() : null));
Review Comment:
Because of the existing logic, it's not possible for the set of partitions
passed to `beginningOffsets()` and `endOffsets()` to include partitions that
are not in the returned set.
For example, if a topic has two partitions (0 and 1), attempting to search
for partitions 0, 1, **and** 2 does not work. Wrong or right, both consumers
will enter a loop, attempting to determine the leader for partition 2.
In that case, when the user calls `beginningOffsets()` or `endOffsets()`
with a timeout, a `TimeoutException` will eventually be thrown. If no timeout
is provided, those API calls hang forever looking for the leader 😱
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