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https://issues.apache.org/jira/browse/NIFI-748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15005985#comment-15005985
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ASF GitHub Bot commented on NIFI-748:
-------------------------------------

Github user apiri commented on the pull request:

    https://github.com/apache/nifi/pull/123#issuecomment-156841554
  
    Grabbed the PR locally and scoped it out.  Nothing substantive to add 
beyond those comments here already.  Performed some querying of a locally 
running instance with the new patch applied and didn't notice any tremendous 
performance impacts.  Will continue to run as this patch goes through it's 
final paces.


> If unable to find a specific Provenance event, should not fail entire search
> ----------------------------------------------------------------------------
>
>                 Key: NIFI-748
>                 URL: https://issues.apache.org/jira/browse/NIFI-748
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Core Framework
>            Reporter: Mark Payne
>            Assignee: Oleg Zhurakousky
>             Fix For: 0.4.0
>
>
> We have a case where running with the prov being written to a disk that can 
> be ejected. Disk was accidentally ejected while running. Provenance Event 
> appears to have been indexed but event is not in the repo.
> Specifically, we are reaching Line 104 of DocsReader:
> {code}
> throw new IOException("Failed to find Provenance Event " + d);
> {code}
> As a result, searching for a specific Component ID is returning an error, so 
> we can't search on that Component ID at all (unless we shrink the time range 
> to a time when that didn't occur).
> We should generate a warning, and notify the user that X number of events 
> could not be found and show what we can, rather than erroring out entirely.



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