symat commented on issue #1300: ZOOKEEPER-3769: handling malformed Leader Election notification messages URL: https://github.com/apache/zookeeper/pull/1300#issuecomment-607794733 well, actually I was not able to reproduce the issue even with JDK 12. I am not sure if it is specific to JDK 12 or not. I know that the issue was reproducible for Lasaro on his environment (with JDK 12 on CentOS 7) for a while, but now even he can not reproduce it. (Maybe some OS upgrade or network change fixed it for him?) So honestly I don't know what triggered this issue or why we haven't seen this before. But I think it is good to handle these exceptions in the code, even if I can not trigger them with real ZooKeeper, only by unit tests. And having more tests for malformed / partial messages never hurts. Actually one can consider this as a security fix as well, since in theory you were able to knock out any Follower from the quorum just by sending a partial election vote message.
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