CalvinConfluent commented on code in PR #14594:
URL: https://github.com/apache/kafka/pull/14594#discussion_r1373421615
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core/src/main/scala/kafka/cluster/Partition.scala:
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@@ -359,10 +361,14 @@ class Partition(val topicPartition: TopicPartition,
// a false positive under min isr check, it has to check the
leaderReplicaIdOpt again. Though it can still be affected
// by ABA problems when leader->follower->leader, but it should be good
enough for a metric.
def isUnderMinIsr: Boolean = {
- leaderLogIfLocal.exists { partitionState.isr.size <
_.config.minInSyncReplicas } && isLeader
+ leaderLogIfLocal.exists{partitionState.isr.size < effectiveMinIsr(_) } &&
isLeader
}
- def isAtMinIsr: Boolean = leaderLogIfLocal.exists { partitionState.isr.size
== _.config.minInSyncReplicas }
+ private def effectiveMinIsr(leaderLog: UnifiedLog): Int = {
+ leaderLog.config.minInSyncReplicas.min(remoteReplicasMap.size + 1)
Review Comment:
The removed UT tries to set the min ISR larger than the replication factor.
Basically, we don't have any requirements over the minISR value. If someone
set or has set the minISR wrongly, it will be wield availability issue after
the upgrade.
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