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https://issues.apache.org/jira/browse/KAFKA-551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470900#comment-13470900
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Jun Rao commented on KAFKA-551:
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Currently, we mark the first n-1 segments as read-only channels on broker
startup. It doesn't seem to hurt to open them as r/w. Yes, it would great if
you can fix it in your patch to take care of the index part too.
> Log.truncateTo() may need to trucate immutable log segment
> ----------------------------------------------------------
>
> Key: KAFKA-551
> URL: https://issues.apache.org/jira/browse/KAFKA-551
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.8
> Reporter: Jun Rao
> Priority: Blocker
> Labels: bugs
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> In makeFollower, we need to first truncate the local log to high watermark.
> It's possible that we need to truncate into segments before the last one. The
> problem is that all segments except the last one are immutable. So the
> truncation will fail which prevents the replica fetcher from being started.
> One solution is to reopen the segment as mutable during truncation, if it's
> not mutable already.
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