GitHub user markap14 opened a pull request:

    https://github.com/apache/nifi/pull/2693

    NIFI-950: Make component validation asynchronous

    This PR addresses NIFI-950 as well as a handful of other related JIRAs. I 
used a single PR because a lot of the solutions to the issues built upon one 
another and because the intent of this PR is basically to make clustering more 
stable and to make the UI feel less sluggish when clustered.
    
    
    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.
    
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You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/markap14/nifi NIFI-950

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

    https://github.com/apache/nifi/pull/2693.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 #2693
    
----
commit b155a7474e98eb597b2417fef276a6bcddf18d78
Author: Mark Payne <markap14@...>
Date:   2018-04-11T19:36:54Z

    NIFI-950: Make component validation asynchronous
    NIFI-950: Still seeing some slow response times when instantiating a large 
template in cluster mode so making some minor tweaks based on the results of 
CPU profiling
    NIFI-5112: Refactored FlowSerializer so that it creates the desired 
intermediate data model that can be serialized, separate from serializing. This 
allows us to hold the FlowController's Read Lock only while creating the data 
model, not while actually serializing the data. Configured Jersey Client in 
ThreadPoolRequestReplicator not to look for features using the Service Loader 
for every request. Updated Template object to hold a DOM Node that represents 
the template contents instead of having to serialize the DTO, then parse the 
serialized form as a DOM object each time that it needs to be serialized.
    NIFI-5112: Change ThreadPoolRequestReplicator to use OkHttp client instead 
of Jersey Client
    NIFI-5111: Ensure that if a node is no longer cluster coordinator, that it 
clears any stale heartbeats.
    NIFI-5110: Notify StandardProcessScheduler when a component is removed so 
that it will clean up any resource related to component lifecycle.

commit be01d8e1d2fc985a852ee849bdb4c39639642ae1
Author: Mark Payne <markap14@...>
Date:   2018-04-24T19:52:36Z

    NIFI-950: Avoid gathering the Status objects for entire flow when we don't 
need them; removed unnecessary code

commit 1751d276813fa52fa98f9656c712931c130e66f3
Author: Mark Payne <markap14@...>
Date:   2018-05-03T20:07:10Z

    NIFI-950: Bug fixes

commit d6e29be47b9befa218df4ecb0af33d7b15df6be2
Author: Mark Payne <markap14@...>
Date:   2018-05-08T17:35:44Z

    NIFI-950: Bug fix; added validation status to ProcessorDTO, 
ControllerServiceDTO, ReportingTaskDTO; updated DebugFlow to allow for pause 
time to be set in the customValidate method for testing functionality

commit 352bc4c9eb880f29cb2aefcb29539923f00ad89b
Author: Mark Payne <markap14@...>
Date:   2018-05-08T19:59:43Z

    NIFI-950: Addressing test failures

commit bc800b8dafcb093089382eba5077079d389121d2
Author: Mark Payne <markap14@...>
Date:   2018-05-09T14:02:03Z

    NIFI-950: Bug fixes

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