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https://issues.apache.org/jira/browse/NIFI-9559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17478820#comment-17478820
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Nathan Gough commented on NIFI-9559:
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Apache curator will be upgraded to 5.2.0 in NiFi 1.16.0, which may address this
issue. Also, potentially you could try upgrading your external Zookeeper
servers to 3.7.0 which might have a fix as per this issue
https://issues.apache.org/jira/browse/ZOOKEEPER-3706. I'm not certain that NiFi
1.14.0 will be compatible with ZK 3.7.0 so that should be tested before
upgrading.
> Zookeeper Client Can't Reconnect - Session timeout has elapsed while SUSPENDED
> ------------------------------------------------------------------------------
>
> Key: NIFI-9559
> URL: https://issues.apache.org/jira/browse/NIFI-9559
> Project: Apache NiFi
> Issue Type: Bug
> Reporter: Shawn Weeks
> Assignee: Nathan Gough
> Priority: Minor
> Attachments: nifi_and_zookeeper_logs.txt
>
>
> It's possible this is fixed in 1.15.2 but I don't see any commits that would
> have resolved it. After a loss of connection to Zookeeper a NiFi node never
> successfully reconnects to the Zookeeper or the Cluster and instead returns
> errors about no Cluster Coordinator and a Session timeout has elapsed while
> SUSPENDED repeatedly until you restart NiFi.
> The error described is the same one at
> https://issues.apache.org/jira/browse/CURATOR-405 however that patch has been
> in NiFi for several versions now.
> NiFi version is 1.14.0 and Zookeeper 3.6.3
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