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https://issues.apache.org/jira/browse/HADOOP-16763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16996922#comment-16996922
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Akira Ajisaka commented on HADOOP-16763:
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We hit the same issue and we are going to upgrade our ZooKeeper cluster to
3.5.6 before upgrading Hadoop to the latest trunk, therefore we don't have
experience with the soft-compatibility mode.
As the document says, ZK 3.4.x dependency is required for the
soft-compatibility mode, so I would like to propose creating a profile to build
Hadoop with ZK 3.4.x.
> Make Curator 4 run in soft-compatibility mode with ZooKeeper 3.4
> ----------------------------------------------------------------
>
> Key: HADOOP-16763
> URL: https://issues.apache.org/jira/browse/HADOOP-16763
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Íñigo Goiri
> Priority: Major
>
> HADOOP-16579 changed Curator to 4.2 and ZooKeeper to 3.5.
> This change relate to the client libraries used by the components.
> However, the ensemble in most deployments is 3.4 (default in Ubuntu for
> example).
> To allow this mode, there is a soft-compatibility mode described in
> http://curator.apache.org/zk-compatibility.html
> We should enable this soft-compatibility mode.
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