[ 
https://issues.apache.org/jira/browse/NIFI-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16023606#comment-16023606
 ] 

ASF GitHub Bot commented on NIFI-3972:
--------------------------------------

GitHub user markap14 opened a pull request:

    https://github.com/apache/nifi/pull/1855

    NIFI-3972: Ensure that we wait until service state becomes enabled be…

    …fore triggering completable future that says that it's enabled
    
    Thank you for submitting a contribution to Apache NiFi.
    
    In order to streamline the review of the contribution we ask you
    to ensure the following steps have been taken:
    
    ### For all changes:
    - [ ] Is there a JIRA ticket associated with this PR? Is it referenced 
         in the commit message?
    
    - [ ] Does your PR title start with NIFI-XXXX where XXXX is the JIRA number 
you are trying to resolve? Pay particular attention to the hyphen "-" character.
    
    - [ ] Has your PR been rebased against the latest commit within the target 
branch (typically master)?
    
    - [ ] Is your initial contribution a single, squashed commit?
    
    ### For code changes:
    - [ ] Have you ensured that the full suite of tests is executed via mvn 
-Pcontrib-check clean install at the root nifi folder?
    - [ ] Have you written or updated unit tests to verify your changes?
    - [ ] If adding new dependencies to the code, are these dependencies 
licensed in a way that is compatible for inclusion under [ASF 
2.0](http://www.apache.org/legal/resolved.html#category-a)? 
    - [ ] If applicable, have you updated the LICENSE file, including the main 
LICENSE file under nifi-assembly?
    - [ ] If applicable, have you updated the NOTICE file, including the main 
NOTICE file found under nifi-assembly?
    - [ ] If adding new Properties, have you added .displayName in addition to 
.name (programmatic access) for each of the new properties?
    
    ### For documentation related changes:
    - [ ] Have you ensured that format looks appropriate for the output in 
which it is rendered?
    
    ### Note:
    Please ensure that once the PR is submitted, you check travis-ci for build 
issues and submit an update to your PR as soon as possible.


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/markap14/nifi NIFI-3972

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/nifi/pull/1855.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1855
    
----
commit 27ca0d809e3105993396d80b7efb5268f68a263d
Author: Mark Payne <marka...@hotmail.com>
Date:   2017-05-24T20:15:18Z

    NIFI-3972: Ensure that we wait until service state becomes enabled before 
triggering completable future that says that it's enabled

----


> Controller Service failing to enabled because the service it depends on is 
> not fully enabled on nifi restart
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: NIFI-3972
>                 URL: https://issues.apache.org/jira/browse/NIFI-3972
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>            Reporter: Mark Payne
>            Assignee: Mark Payne
>
> I have a JsonRecordSetWriter controller service. It depends on a Schema 
> Registry controller service. Both are enabled. Upon restart, the 
> JsonRecordSetWriter service fails to enable, indicating that the Schema 
> Registry service is not enabled. When I look at the Controller Service 
> configuration, though, the Schema Registry service is enabled. So it appears 
> that the JsonRecordSetWriter was attempting to be enabled before the Schema 
> Registry Service finishes enabling.
> {code}
> 2017-05-24 19:46:56,314 ERROR [main] 
> o.a.n.c.s.StandardControllerServiceProvider Failed to enable 
> JsonRecordSetWriter[id=0d273e88-9bd7-1dd9-ffff-ffffc1e1a536]
> java.lang.IllegalStateException: Cannot invoke method public abstract 
> java.util.Set 
> org.apache.nifi.schemaregistry.services.SchemaRegistry.getSuppliedSchemaFields()
>  on Controller Service with identifier 0660348b-255e-1f3a-ffff-fffffb399783 
> because the Controller Service is disabled
>         at 
> org.apache.nifi.controller.service.StandardControllerServiceInvocationHandler.invoke(StandardControllerServiceInvocationHandler.java:84)
>         at com.sun.proxy.$Proxy85.getSuppliedSchemaFields(Unknown Source)
>         at 
> org.apache.nifi.schema.access.SchemaNamePropertyStrategy.<init>(SchemaNamePropertyStrategy.java:42)
>         at 
> org.apache.nifi.schema.access.SchemaAccessUtils.getSchemaAccessStrategy(SchemaAccessUtils.java:147)
>         at 
> org.apache.nifi.serialization.SchemaRegistryService.getSchemaAccessStrategy(SchemaRegistryService.java:149)
>         at 
> org.apache.nifi.serialization.SchemaRegistryService.getSuppliedSchemaFields(SchemaRegistryService.java:128)
>         at 
> org.apache.nifi.serialization.SchemaRegistryRecordSetWriter.customValidate(SchemaRegistryRecordSetWriter.java:160)
>         at 
> org.apache.nifi.components.AbstractConfigurableComponent.validate(AbstractConfigurableComponent.java:126)
>         at 
> org.apache.nifi.controller.AbstractConfiguredComponent.validate(AbstractConfiguredComponent.java:326)
>         at 
> org.apache.nifi.controller.AbstractConfiguredComponent.isValid(AbstractConfiguredComponent.java:441)
>         at 
> org.apache.nifi.controller.service.StandardControllerServiceNode.verifyCanEnable(StandardControllerServiceNode.java:301)
>         at 
> org.apache.nifi.controller.service.StandardControllerServiceProvider.enableControllerService(StandardControllerServiceProvider.java:327)
>         at 
> org.apache.nifi.controller.service.StandardControllerServiceProvider.enableControllerServiceDependenciesFirst(StandardControllerServiceProvider.java:384)
>         at 
> org.apache.nifi.controller.service.StandardControllerServiceProvider.enableControllerServices(StandardControllerServiceProvider.java:350)
>         at 
> org.apache.nifi.controller.FlowController.enableControllerServices(FlowController.java:3271)
>         at 
> org.apache.nifi.controller.service.ControllerServiceLoader.enableControllerServices(ControllerServiceLoader.java:159)
>         at 
> org.apache.nifi.controller.service.ControllerServiceLoader.enableControllerServices(ControllerServiceLoader.java:152)
>         at 
> org.apache.nifi.controller.StandardFlowSynchronizer.addProcessGroup(StandardFlowSynchronizer.java:1042)
>         at 
> org.apache.nifi.controller.StandardFlowSynchronizer.sync(StandardFlowSynchronizer.java:312)
>         at 
> org.apache.nifi.controller.FlowController.synchronize(FlowController.java:1554)
>         at 
> org.apache.nifi.persistence.StandardXMLFlowConfigurationDAO.load(StandardXMLFlowConfigurationDAO.java:84)
>         at 
> org.apache.nifi.controller.StandardFlowService.loadFromBytes(StandardFlowService.java:722)
>         at 
> org.apache.nifi.controller.StandardFlowService.load(StandardFlowService.java:452)
>         at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:800)
>         at org.apache.nifi.NiFi.<init>(NiFi.java:160)
>         at org.apache.nifi.NiFi.main(NiFi.java:267)
> {code}



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