[jira] [Updated] (KAFKA-6492) LogSemgent.truncateTo() should always resize the index file

["Jiangjie Qin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-6492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jiangjie Qin updated KAFKA-6492:
--------------------------------
    Affects Version/s: 1.0.0
        Fix Version/s: 1.1.0
          Component/s: core

> LogSemgent.truncateTo() should always resize the index file
> -----------------------------------------------------------
>
>                 Key: KAFKA-6492
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6492
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.0.0
>            Reporter: Jiangjie Qin
>            Priority: Major
>             Fix For: 1.1.0
>
>
> The bug is the following:
>  # Initially on a follower broker there are two segments 0 and segment 10000. Segment 0 is empty (maybe due to log compaction)
>  # log is truncated to 0.
>  # LogSemgent.Truncate() will not find a message to truncate in segment 0, so it will skip resizing the index/timeindex files. 
>  # When a new message is fetched, Log.maybeRoll() will try to roll a new segment because the index file of segment 0 is already full (max size is 0)
>  # After creating the new segment 0, the replica fetcher thread finds that there is already a segment 0 exists. So it just throws exception and dies.
> The fix would be let the broker make sure the index files of active segments are always resized properly.



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