GitHub user MaxGekk opened a pull request:

    [SPARK-23620] Splitting thread dump lines by using the br tag

    ## What changes were proposed in this pull request?
    I propose to replace `'\n'` by the `<br>` tag in generated html of thread 
dump page. The `<br>` tag will split thread lines in more reliable way. For now 
it could look like on 
    <img width="1265" alt="the screen shot" 
     if the html is proxied and `'\n'` is replaced by another whitespace. The 
changes allow to more easily read and copy stack traces.
    ## How was this patch tested?
    I tested it manually by checking the thread dump page and its source.

You can merge this pull request into a Git repository by running:

    $ git pull br-thread-dump

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

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #20762
commit d1d95c6d351b03f99eb16a70329fe450cd47daca
Author: Maxim Gekk <maxim.gekk@...>
Date:   2018-03-07T20:36:07Z

    Splitting thread dump lines by using the br tag



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