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https://issues.apache.org/jira/browse/KAFKA-2165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14570391#comment-14570391
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Yu Yang commented on KAFKA-2165:
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We have also seen this issue in our kafka 0.8.2.1 cluster.
> ReplicaFetcherThread: data loss on unknown exception
> ----------------------------------------------------
>
> Key: KAFKA-2165
> URL: https://issues.apache.org/jira/browse/KAFKA-2165
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.8.2.1
> Reporter: Alexey Ozeritskiy
> Attachments: KAFKA-2165.patch
>
>
> Sometimes in our cluster some replica gets out of the isr. Then broker
> redownloads the partition from the beginning. We got the following messages
> in logs:
> {code}
> # The leader:
> [2015-03-25 11:11:07,796] ERROR [Replica Manager on Broker 21]: Error when
> processing fetch request for partition [topic,11] offset 54369274 from
> follower with correlation id 2634499. Possible cause: Request for offset
> 54369274 but we only have log segments in the range 49322124 to 54369273.
> (kafka.server.ReplicaManager)
> {code}
> {code}
> # The follower:
> [2015-03-25 11:11:08,816] WARN [ReplicaFetcherThread-0-21], Replica 31 for
> partition [topic,11] reset its fetch offset from 49322124 to current leader
> 21's start offset 49322124 (kafka.server.ReplicaFetcherThread)
> [2015-03-25 11:11:08,816] ERROR [ReplicaFetcherThread-0-21], Current offset
> 54369274 for partition [topic,11] out of range; reset offset to 49322124
> (kafka.server.ReplicaFetcherThread)
> {code}
> This occures because we update fetchOffset
> [here|https://github.com/apache/kafka/blob/0.8.2/core/src/main/scala/kafka/server/AbstractFetcherThread.scala#L124]
> and then try to process message.
> If any exception except OffsetOutOfRangeCode occures we get unsynchronized
> fetchOffset and replica.logEndOffset.
> On next fetch iteration we can get
> fetchOffset>replica.logEndOffset==leaderEndOffset and OffsetOutOfRangeCode.
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