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https://issues.apache.org/jira/browse/ZOOKEEPER-1787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14108036#comment-14108036
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Raul Gutierrez Segales commented on ZOOKEEPER-1787:
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Not sure. Local sessions are not enabled by default though:
{noformat}
/**
* Whether learners in this quorum should create new sessions as local.
* False by default to preserve existing behavior.
*/
protected boolean localSessionsEnabled = false;
{noformat}
so it won't actually break out of the box rolling upgrades.
> Add support for enabling local session in rolling upgrade
> ---------------------------------------------------------
>
> Key: ZOOKEEPER-1787
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1787
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.5.0
> Reporter: Thawan Kooburat
> Assignee: Raul Gutierrez Segales
> Priority: Minor
> Attachments: ZOOKEEPER-1787.patch
>
>
> Currently, local session need to be enable by stopping the entire ensemble.
> If a rolling upgrade is used, all write request from a local session will
> fail with session move until the local session is enabled on the leader.
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