Github user hmcl commented on a diff in the pull request: https://github.com/apache/storm/pull/1924#discussion_r99931862 --- Diff: external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpout.java --- @@ -289,6 +293,13 @@ private void doSeekRetriableTopicPartitions() { kafkaConsumer.seek(rtp, acked.get(rtp).getCommittedOffset() + 1); // Seek to last committed offset } } + + if(!retriableTopicPartitions.isEmpty()) { + //Pause other partitions for this poll so maxUncommittedPartitions isn't exceeded by too much --- End diff -- I am still not quite understanding why we need to pause all other topic partitions in the case of a retrial. This could potentially lead to the scenario that one topic partition may be causing a lot of failures, but all others are running fine. If that's the case, we will the throttling all other topic-partitions for no particular reason. Are you doing this pause to handle the case when `nunUncommittedOffsets` may exceed `maxUncommittedOffsets`? If that is the case, then in the case of a retrial we should only only when `nunUncommittedOffsets >= maxUncommittedOffsets`. Otherwise perhaps we should poll from all topic-partitions.
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