Jun Rao created KAFKA-551:
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Summary: 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
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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