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https://issues.apache.org/jira/browse/NIFI-4774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373160#comment-16373160
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ASF GitHub Bot commented on NIFI-4774:
--------------------------------------

GitHub user markap14 opened a pull request:

    https://github.com/apache/nifi/pull/2487

    NIFI-4774: Allow user to choose which write-ahead log implementation …

    …should be used by the WriteAheadFlowFileRepository
    
    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?
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    - [ ] If adding new Properties, have you added .displayName in addition to 
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    ### Note:
    Please ensure that once the PR is submitted, you check travis-ci for build 
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You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/markap14/nifi NIFI-4774-2

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

    https://github.com/apache/nifi/pull/2487.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 #2487
    
----
commit 07c1b1140178b83d69f31a4ec99e8a23d134d962
Author: Mark Payne <markap14@...>
Date:   2018-02-22T17:51:38Z

    NIFI-4774: Allow user to choose which write-ahead log implementation should 
be used by the WriteAheadFlowFileRepository

----


> FlowFile Repository should write updates to the same FlowFile to the same 
> partition
> -----------------------------------------------------------------------------------
>
>                 Key: NIFI-4774
>                 URL: https://issues.apache.org/jira/browse/NIFI-4774
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Core Framework
>            Reporter: Mark Payne
>            Assignee: Mark Payne
>            Priority: Major
>             Fix For: 1.6.0
>
>
> As-is, in the case of power loss or Operating System crash, we could have an 
> update that is lost, and then an update for the same FlowFile that is not 
> lost, because the updates for a given FlowFile can span partitions. If an 
> update were written to Partition 1 and then to Partition 2 and Partition 2 is 
> flushed to disk by the Operating System and then the Operating System crashes 
> or power is lost before Partition 1 is flushed to disk, we could lose the 
> update to Partition 1.



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