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https://issues.apache.org/jira/browse/NIFI-543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16432603#comment-16432603
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ASF GitHub Bot commented on NIFI-543:
-------------------------------------

Github user zenfenan commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/2509#discussion_r180499984
  
    --- Diff: 
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-ui/src/main/webapp/js/nf/canvas/nf-processor-configuration.js
 ---
    @@ -741,8 +742,8 @@
                             }
                         });
     
    -                    // show the execution node option if we're cluster or 
we're currently configured to run on the primary node only
    -                    if (nfClusterSummary.isClustered() || executionNode 
=== 'PRIMARY') {
    +                    // show the execution node option if we're clustered 
and execution node is not restricted to run only in primary node
    +                    if (nfClusterSummary.isClustered() && 
executionNodeRestricted !== true) {
    --- End diff --
    
    We can make it this: `if ((nfClusterSummary.isClustered() && 
executionNodeRestricted !== true) || (!nfClusterSummary.isClustered() && 
executionNode === 'PRIMARY'))` but I don't understand why we are doing the 
executionNode === 'PRIMARY' check, for the same reason I had mentioned above.


> Provide extensions a way to indicate that they can run only on primary node, 
> if clustered
> -----------------------------------------------------------------------------------------
>
>                 Key: NIFI-543
>                 URL: https://issues.apache.org/jira/browse/NIFI-543
>             Project: Apache NiFi
>          Issue Type: Sub-task
>          Components: Core Framework, Documentation & Website, Extensions
>            Reporter: Mark Payne
>            Assignee: Sivaprasanna Sethuraman
>            Priority: Major
>
> There are Processors that are known to be problematic if run from multiple 
> nodes simultaneously. These processors should be able to use a 
> @PrimaryNodeOnly annotation (or something similar) to indicate that they can 
> be scheduled to run only on primary node if run in a cluster.



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