Oh thank you very much for the pull request. For now, I was extracting DoFs
corresponding to hanging nodes by using is_constrained(dof).in parallel.



On Sat, Dec 9, 2017 at 6:26 AM, Daniel Arndt <
daniel.ar...@iwr.uni-heidelberg.de> wrote:

> Phani,
>
> apparently no one used this function for a 
> parallel::distributed::Triangulation
> before. The problem is that we don't know about DoFs on artficial cells.
> The pull request https://github.com/dealii/dealii/pull/5604 fixes this
> issue by extracting DoFs belonging to locally owned cells.
> Essentially, you only have to guard the cell loops in
> extract_hanging_node_dofs by
>
> if (cell->is_locally_owned())
>
> Best,
> Daniel
>
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