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https://issues.apache.org/jira/browse/ZOOKEEPER-2205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14573349#comment-14573349
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Raul Gutierrez Segales commented on ZOOKEEPER-2205:
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I think logging should be enough for now. Also, if we added a new type of
quorum packet in the future, crashing when seeing an unknown type would be
problematic for rolling upgrades were some members have the old code that
doesn't understand the new QuorumPacket type.
> Log type of unexpected quorum packet in learner handler loop
> ------------------------------------------------------------
>
> Key: ZOOKEEPER-2205
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2205
> Project: ZooKeeper
> Issue Type: Improvement
> Components: server
> Reporter: Hitoshi Mitake
> Assignee: Hitoshi Mitake
> Priority: Trivial
> Attachments: ZOOKEEPER-2205-v2.patch, ZOOKEEPER-2205.patch
>
>
> Current learner handler loop doesn't log anything when it receives unexpected
> type of quorum packet from learner.
> This patch lets the learner handler loop log the type of packet for defensive
> purpose. It would make debugging and trouble shooting a little bit easier.
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