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https://issues.apache.org/jira/browse/ZOOKEEPER-2132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14339326#comment-14339326
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Flavio Junqueira commented on ZOOKEEPER-2132:
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hi asad, thanks for reporting. I'm wondering if this is a duplicate of
ZOOKEEPER-1797.
> Follower::syncWithLeader should roll logs before taking snapshot
> ----------------------------------------------------------------
>
> Key: ZOOKEEPER-2132
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2132
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.6
> Reporter: Asad Saeed
>
> If multiple leader elections occur before SyncRequestProcessor takes a
> snapshot and rolls logs (at least 50000 transactions by default). PurgeTxnLog
> may inadvertently delete the current transaction log file.
> Follower::syncWithLeader currently takes a snapshot after it is synced with
> the leader but does not roll logs. If a zookeeper restart of a quorum of
> nodes occurs, the cluster may silently revert back to the last snapshot,
> loosing all transactions in the log!
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