Alexander Shraer created ZOOKEEPER-2513:
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Summary: 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
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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