[jira] [Created] (NIFI-6937) Fix: ReportLineageToAtlas creates data and queue with same qualified name leading to exception

["Tamas Palfy (Jira)" <ji...@apache.org>]

Tamas Palfy created NIFI-6937:
---------------------------------

             Summary: Fix: ReportLineageToAtlas creates data and queue with same qualified name leading to exception
                 Key: NIFI-6937
                 URL: https://issues.apache.org/jira/browse/NIFI-6937
             Project: Apache NiFi
          Issue Type: Bug
            Reporter: Tamas Palfy
         Attachments: atlas_duplicate_key.xml

ReportLineageToAtlas with certain setup can throw the following exception, failing to send reports to Atlas (but keeping on trying infinitely):
{code:java}
Error running task[id=9a705e6d-0168-1000-0000-00001cacda42] due to java.lang.IllegalStateException: Duplicate key {Id='(type: nifi_queue, id: 03f60cff-0aca-4536-a4ff-00eab811600c)', traits=[], values={}}
{code}
The exception is coming from
[https://github.com/apache/nifi/blob/79a7014a95dc3087f88248c732fb1e4ad8e6e128/nifi-nar-bundles/nifi-atlas-bundle/nifi-atlas-reporting-task/src/main/java/org/apache/nifi/atlas/hook/NotificationSender.java#L390
]and The problem is that an Atlass Processor entity has a _nifi_queue_ and a _nifi_data_ DataSet input entity with the same _qualifiedName_.

It can happen when the NiFi processor (*{{P_Subject}}*) that corresponds to the Atlas Processor entity
 # has an inbound connection that is represented by an Atlas by a _nifi_queue_ entity. (There are multiple ways to enforce this, one by making sure the origin processor of the inbound queue (*{{P_Origin}}*, where *{{P_Origin -> P_Subject}}*) has a connection to another processor as well, like *{{P_Origin -> P_Other}}*, so the flow looks like this:    
{code:java}
         /->P_Subject
        /
P_Origin 
        \
         \->P_Other
{code}

 # also generates an input (CREATE, RECEIVE or FETCH) provenance event on its own and does not have a special input (like _fs_path_ or _hive_table_), just uses the generic _nifi_data_ Atlas type for representing its input (called "unknown" processor in the documentation of the reporting task)

See attached [#atlas_duplicat_key.xml] for an example flow template.

Here _InvokeHTTP_ has an input _nifi_queue_ entity in Atlas (see explanation above, for more details see the Path Separation Logic section in the reporting task docs). Its _qualifiedName_ is _processorUUID@clustername_ (derived from the next processor's UUID, so _InvokeHTTP_'s UUID in this case).

It also sends the incoming flowfile in the HTTP request and creates another flowfile from the HTTP response which generates a FETCH event which in turn generates a _nifi_data_ entity in Atlas. Its _qualifiedName_ is also _processorUUID@clustername_ (using the processor's UUID that generates the event, so _InvokeHTTP_'s UUID).

These two entities having the same _qualifiedName_, causing the duplicate key error.



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