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https://issues.apache.org/jira/browse/KAFKA-13767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-13767.
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Reviewer: David Jacot
Resolution: Fixed
> Fetch from consumers should return immediately when preferred read replica is
> defined by the leader
> ---------------------------------------------------------------------------------------------------
>
> Key: KAFKA-13767
> URL: https://issues.apache.org/jira/browse/KAFKA-13767
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 2.4.0
> Reporter: zhaobo
> Assignee: zhaobo
> Priority: Minor
> Fix For: 3.2.0
>
>
>
> {code:java}
> def readFromLocalLog()
> ...
> if (preferredReadReplica.isDefined) {
> ....
> // If a preferred read-replica is set, skip the read
> val offsetSnapshot =
> partition.fetchOffsetSnapshot(fetchInfo.currentLeaderEpoch,
> fetchOnlyFromLeader = false)
> LogReadResult(info = FetchDataInfo(LogOffsetMetadata.UnknownOffsetMetadata,
> MemoryRecords.EMPTY),
> divergingEpoch = None,
> ....
> } {code}
>
> when a preferred read-replica is set, skip the read ,return empty data. The
> fetch request maybe put into the delayFetchQueue and repeat execute the
> readFromLocalLog() . It might be better to return the response right away.
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