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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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zhaobo updated KAFKA-13767:
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Summary: Fetch request does not need to put into delayFetch queue when
preferred read replica not local replica (was: Consumer fetch request does not
need to put into delayFetch queue when the preferred read replica not local
replica)
> Fetch request does not need to put into delayFetch queue when preferred read
> replica not local replica
> ------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-13767
> URL: https://issues.apache.org/jira/browse/KAFKA-13767
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 3.2.0
> Reporter: 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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