[jira] [Commented] (KAFKA-5326) Log offset index resize cause empty index file

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-5326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16024728#comment-16024728 ] 

ASF GitHub Bot commented on KAFKA-5326:
---------------------------------------

GitHub user ZanderXu opened a pull request:

    https://github.com/apache/kafka/pull/3143

    to resolved the KAFKA-5326

    This modify to resolved the [KAFKA-5326](https://issues.apache.org/jira/browse/KAFKA-5326).

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/ZanderXu/kafka trunk

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/kafka/pull/3143.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #3143
    
----
commit 0be6d5b1397443f2d6bb953ecd1cd13e31abd4fd
Author: xuzq <xuzq>
Date:   2017-05-25T13:26:38Z

    to resolved the KAFKA-5326

----


> 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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