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https://issues.apache.org/jira/browse/ZOOKEEPER-1156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13087152#comment-13087152
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Mahadev konar commented on ZOOKEEPER-1156:
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Vishal,
I am little confused. Why is there a correctness issue here? I can see
performance issue but dont see a correctness issue. Can you explain the
scenario?
> Log truncation truncating log too much - can cause data loss
> ------------------------------------------------------------
>
> Key: ZOOKEEPER-1156
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1156
> Project: ZooKeeper
> Issue Type: Bug
> Components: quorum, server
> Affects Versions: 3.3.3
> Reporter: Vishal Kathuria
> Priority: Blocker
> Fix For: 3.3.4
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> The log truncation relies on position calculation for a particular zxid to
> figure out the new size of the log file. There is a bug in
> PositionInputStream implementation which skips counting the bytes in the log
> which have value 0. This can lead to underestimating the actual log size. The
> log records which should be there can get truncated, leading to data loss on
> the participant which is executing the trunc.
> Clients can see different values depending on whether they connect to the
> node on which trunc was executed.
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