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https://issues.apache.org/jira/browse/KAFKA-5326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16024835#comment-16024835
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xuzq commented on KAFKA-5326:
-----------------------------
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, will create a new ".index" file which the size is "roundedNewSize",
but the content is empty.
> Log offset index resize cause empty index file
> ------------------------------------------------
>
> Key: KAFKA-5326
> URL: https://issues.apache.org/jira/browse/KAFKA-5326
> Project: Kafka
> Issue Type: Bug
> Components: core, log
> Affects Versions: 0.10.2.1
> Reporter: Ma Tianchi
>
> After a log index file lost or be removed when kafka server is running,then
> some one calls OffsetIndex.resize(newSize: Int) .It will cause a new index
> file be created but there is no values in it,even though the size is same
> with old one.
> It will do something as below.
> val raf = new RandomAccessFile(file, "rw")
> This time file does not exit.It will create a new file.
> Then at:
> mmap = raf.getChannel().map(FileChannel.MapMode.READ_WRITE, 0, roundedNewSize)
> The mmap is created from new file which is empty.
> and then:
> mmap.position(position)
> This make the new index file which size is same with old index file,but there
> is nothing in it.
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