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https://issues.apache.org/jira/browse/ZOOKEEPER-2513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arshad Mohammad reassigned ZOOKEEPER-2513:
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Assignee: Arshad Mohammad
> majorChange exceptions during leader sync
> -----------------------------------------
>
> Key: ZOOKEEPER-2513
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2513
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.5.2
> Reporter: Alexander Shraer
> Assignee: Arshad Mohammad
> Priority: Critical
>
> In Learner.java there are exceptions being thrown in case majorChange = true,
> i.e., a reconfig is encountered in the stream of updates from the leader.
> There may be two problems in the way such exceptions are thrown:
> 1. important actions, e.g., processTxn, will not be done if an exception is
> thrown
> 2. its unclear that the learner will be able to continue where it left off in
> the process of syncing with the leader, if that sync is interrupted by an
> exception.
> This requires further investigation. Whereas similar code in Follower and
> Observer is extensively tested, this code in Learner isn't tested as much. We
> could build on the test case developed in ZOOKEEPER-2172 to make sure this
> code works properly.
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