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https://issues.apache.org/jira/browse/KAFKA-12734?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenbing Shen reassigned KAFKA-12734:
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Assignee: Wenbing Shen
> LazyTimeIndex & LazyOffsetIndex may cause niobufferoverflow when skip
> activeSegment sanityCheck
> ------------------------------------------------------------------------------------------------
>
> Key: KAFKA-12734
> URL: https://issues.apache.org/jira/browse/KAFKA-12734
> Project: Kafka
> Issue Type: Bug
> Components: log
> Affects Versions: 2.4.0, 2.5.0, 2.6.0, 2.7.0, 2.8.0
> Reporter: Wenbing Shen
> Assignee: Wenbing Shen
> Priority: Blocker
> Attachments: LoadIndex.png, niobufferoverflow.png
>
>
> This question is similar to KAFKA-9156
> We introduced Lazy Index, which helps us skip checking the index files of all
> log segments when starting kafka, which has greatly improved the speed of our
> kafka startup.
> Unfortunately, it skips the index file detection of the active segment. The
> active segment will receive write requests from the client or the replica
> synchronization thread.
> There is a situation when we skip the index detection of all segments, and we
> do not need to recover the unflushed log segment, and the index file of the
> last active segment is damaged at this time. When appending data to the
> active segment, at this time The program reported an error.
> Below are the problems I encountered in the production environment:
> When Kafka starts to load the log segment, I see in the program log that the
> memory mapping position of the index file with timestamp and offset is at the
> larger position of the current index file, but in fact, the index file is not
> written With so many index items, I guess this kind of problem will occur
> during the kafka startup process. When kafka has not been started yet, stop
> the kafka process at this time, and then start the kafka process again,
> whether it will cause the limit address of the index file memory map to be a
> file The maximum value is not cut to the actual size used, which will cause
> the memory map position to be set to limit when Kafka is started.
> At this time, adding data to the active segment will cause niobufferoverflow.
> I agree to skip the index detection of all inactive segments, because in fact
> they will no longer receive write requests, but for active segments, we need
> to perform index file detection.
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