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From "Mark Payne (JIRA)" <>
Subject [jira] [Commented] (NIFI-241) Framework FingerprintFactory begins processor life cycle but does not finish
Date Mon, 12 Jan 2015 20:15:35 GMT


Mark Payne commented on NIFI-241:


I'm looking into this. I agree that the framework does call initialize() and the @OnAdded
methods. The @OnAdded methods should not be called, as the Processor is not being added to
the canvas at that point. However, I am not sure that I agree that the initialize() method
should not be called.

I'm curious as to what kind of resources you are allocating here - typically the resource
allocation should happen in methods using @OnScheduled. Can you explain the use case a bit?


> Framework FingerprintFactory begins processor life cycle but does not finish
> ----------------------------------------------------------------------------
>                 Key: NIFI-241
>                 URL:
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>            Reporter: Michael Moser
>            Assignee: Mark Payne
>             Fix For: 0.0.1
> The FingerprintFactory will create Processor objects and invoke their initialize() and
@OnAdded methods.  If a Processor uses system resources, these methods are where those resources
are allocated.  But, those processors are never disposed by calling their @OnRemoved or @OnShutdown
methods.  This may result in system resource leaks, depending on how processors are implemented.
> To reproduce, add a processor to the NiFi graph and restart NiFi.  Note that initialize()
and @OnAdded is called at least twice (I observed 3 times) as NiFi starts.  The getIdentifier()
is different for each invocation.  Shutdown NiFi and observe that @OnShutdown is called once.

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