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https://issues.apache.org/jira/browse/KAFKA-5332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16026130#comment-16026130
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xuzq commented on KAFKA-5332:
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[~junrao]
> When resize the index file, maybe caused the content disappear
> --------------------------------------------------------------
>
> Key: KAFKA-5332
> URL: https://issues.apache.org/jira/browse/KAFKA-5332
> Project: Kafka
> Issue Type: Bug
> Components: core, log
> Affects Versions: 0.10.2.1
> Reporter: xuzq
>
> When resize the index file, maybe caused the content disappear.
> When the kafka server is running, someone removed the index file on the disk
> manually, if at this point, the function AbstractIndex.Resize(newSize: Int)
> is triggered, it will create a new .index file which the size is
> roundedNewSize, but the content is empty.
> After this, the contents of mmap is empty.
> When looking for specific offset corresponds to position, it also return
> zero. The index file to locate the position does not provide any convenience.
> I think if the ".index" is not exist, we should copy the contents from old
> "mmap" to new "mmap" to avoid the "empty file".
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