Github user hmcl commented on a diff in the pull request:
https://github.com/apache/storm/pull/1924#discussion_r106541357
--- Diff:
external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpoutRetryExponentialBackoff.java
---
@@ -54,21 +55,28 @@
private static class RetryEntryTimeStampComparator implements
Serializable, Comparator<RetrySchedule> {
@Override
public int compare(RetrySchedule entry1, RetrySchedule entry2) {
- return
Long.valueOf(entry1.nextRetryTimeNanos()).compareTo(entry2.nextRetryTimeNanos());
+ int result =
Long.valueOf(entry1.nextRetryTimeNanos()).compareTo(entry2.nextRetryTimeNanos());
+
+ if(result == 0) {
+ //TreeSet uses compareTo instead of equals() for the Set
contract
+ //Ensure that we can save two retry schedules with the
same timestamp
--- End diff --
Isn't this impossible to happen? The KafkaSpout is single threaded. When it
calls schedule(msgId) , the scheduled time will be associated with
System.nanoTime().
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