jolshan commented on a change in pull request #11126:
URL: https://github.com/apache/kafka/pull/11126#discussion_r676920282
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File path: core/src/main/scala/kafka/server/ReplicaManager.scala
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@@ -1367,13 +1367,23 @@ class ReplicaManager(val config: KafkaConfig,
val currentLeaderEpoch = partition.getLeaderEpoch
val requestLeaderEpoch = partitionState.leaderEpoch
val requestTopicId = topicIdFromRequest(topicPartition.topic)
+ val logTopicId = partition.topicId
+
+ // We propagate the partition state down if:
+ // 1. The leader epoch is higher than the current leader epoch
of the partition
+ // 2. The leader epoch is same as the current leader epoch but a
new topic id is being assigned. This is
+ // needed to handle the case where a topic id is assigned for
the first time after upgrade.
+ def propagatePartitionState(requestLeaderEpoch: Int,
currentLeaderEpoch: Int): Boolean = {
+ requestLeaderEpoch > currentLeaderEpoch ||
+ (requestLeaderEpoch == currentLeaderEpoch &&
logTopicId.isEmpty && requestTopicId.isDefined)
+ }
- if (!hasConsistentTopicId(requestTopicId, partition.topicId)) {
- stateChangeLogger.error(s"Topic ID in memory:
${partition.topicId.get} does not" +
+ if (!hasConsistentTopicId(requestTopicId, logTopicId)) {
+ stateChangeLogger.error(s"Topic ID in memory:
${logTopicId.get} does not" +
s" match the topic ID for partition $topicPartition
received: " +
s"${requestTopicId.get}.")
responseMap.put(topicPartition, Errors.INCONSISTENT_TOPIC_ID)
- } else if (requestLeaderEpoch > currentLeaderEpoch) {
+ } else if (propagatePartitionState(requestLeaderEpoch,
currentLeaderEpoch)) {
Review comment:
I took a closer look at the code in makeLeader and it seems that we do
not reassign the value for a given epoch.
```
/**
* Assigns the supplied Leader Epoch to the supplied Offset
* Once the epoch is assigned it cannot be reassigned
*/
def assign(epoch: Int, startOffset: Long): Unit = {
val entry = EpochEntry(epoch, startOffset)
if (assign(entry)) {
debug(s"Appended new epoch entry $entry. Cache now contains
${epochs.size} entries.")
flush()
}
}
```
It is true that we may not initially assign a value if there is no epoch
cache. But I'm not sure if that is a case we need to consider (ie, first
request there is not a cache, second request there is)
```
def maybeAssignEpochStartOffset(leaderEpoch: Int, startOffset: Long): Unit =
{
leaderEpochCache.foreach { cache =>
cache.assign(leaderEpoch, startOffset)
}
}
```
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