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https://issues.apache.org/jira/browse/NIFI-5521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16581623#comment-16581623
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Andy LoPresto commented on NIFI-5521:
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[~markap14] Would love to get your thoughts on this. Thanks.
> Provide "clusterNodeName()" function in Expression Language
> -----------------------------------------------------------
>
> Key: NIFI-5521
> URL: https://issues.apache.org/jira/browse/NIFI-5521
> Project: Apache NiFi
> Issue Type: New Feature
> Components: Extensions
> Affects Versions: 1.7.1
> Reporter: Andy LoPresto
> Priority: Major
> Labels: cluster, expression-language, identity, node
>
> I find during debugging that it would be helpful to see which node of a
> cluster processed a specific flowfile. This data is available in the
> provenance records, but is not available to the flowfile during processing. I
> propose a new EL function {{clusterNodeName()}} which would return the
> configured value of {{nifi.web.https.host}} or {{nifi.web.http.host}}. This
> may need to include the {{nifi.web.http(s).port}} value to differentiate if
> multiple instances are being run on the same node.
> The current EL functions of {{ip()}}, {{hostname(true)}}, and
> {{hostname(false)}} do not adequately perform this function because the
> hostname resolver would not be unique when multiple instances are run on the
> same machine.
> Scenario:
> {{node1.nifi.apache.org}} running on localhost with port {{9443}}
> {{node2.nifi.apache.org}} running on localhost with port {{9444}}
> *dnsmasq* settings to resolve {{*.nifi.apache.org}} to {{127.0.0.1}}
> Local machine hostname: {{my-dns-name.local}}
> Local machine IP: {{192.168.0.28}}
> ||Function||Value on Node 1||Value on Node 2||
> |{{ip()}}|192.168.0.28|192.168.0.28|
> |{{hostname(true)}}|192.168.0.28|192.168.0.28|
> |{{hostname(false)}}|my-dns-name.local|my-dns-name.local|
> |{{clusterNodeName()}}|**node1.nifi.apache.org**|**node2.nifi.apache.org**|
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