Github user hmcl commented on a diff in the pull request:
https://github.com/apache/storm/pull/1605#discussion_r79570505
--- Diff:
external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpoutRetryExponentialBackoff.java
---
@@ -144,7 +145,12 @@ public String toString() {
/**
* The time stamp of the next retry is scheduled according to the
exponential backoff formula ( geometric progression):
* nextRetry = failCount == 1 ? currentTime + initialDelay :
currentTime + delayPeriod^(failCount-1) where failCount = 1, 2, 3, ...
- * nextRetry = Min(nextRetry, currentTime + maxDelay)
+ * nextRetry = Min(nextRetry, currentTime + maxDelay).
+ *
+ * While retrying a record, no new records are committed until the
previous polled records have been acked. This guarantees at once delivery of
--- End diff --
This comment should probably not go here, but rather somewhere in the Spout
code. (retry service knows nothing about exactly once or at most once semantics)
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