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https://issues.apache.org/jira/browse/NIFI-3575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15903234#comment-15903234
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Matt Gilman commented on NIFI-3575:
-----------------------------------
[~JPercivall] If you want to review this one, feel free to apply the server
side changes first. This should prevent NiFi from getting into this state. You
should see an error indicating that you cannot move a Process Group into
itself. Then applying the UI changes, it should make this sort of request
impossible from the UI.
> Can lose entire process group when moving components into it from parent PG
> ---------------------------------------------------------------------------
>
> Key: NIFI-3575
> URL: https://issues.apache.org/jira/browse/NIFI-3575
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.1.1
> Reporter: Joseph Percivall
> Assignee: Matt Gilman
> Priority: Critical
> Fix For: 1.2.0
>
>
> When you move any component from the parent group and drag and drop it into a
> process group, if you immediately enter the process group (within
> approximately half a second) the process group will cease to exist (even if
> it had contents already).
> If the UI renders the graph initially, attempting to refreshing the canvas
> returns "Unable to locate group with id: <id of process group that died>".
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