GitHub user abellina opened a pull request:

    https://github.com/apache/storm/pull/1694

    STORM-2101: fixes npe in compute-executors in nimbus

    We observed compute-executors can throw NPE while shutting down a topology 
sporadically. 
    
    joinMaps (join-maps) will NPE if one of the maps is nil. The only one that 
can be nil in this case is component->executors.

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

    $ git pull https://github.com/abellina/storm 
STORM-2101_compute_executors_npe_in_nimbus

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

    https://github.com/apache/storm/pull/1694.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 #1694
    
----
commit b0944100e339f6d28c6c7bb936bef8ebb1948d89
Author: Alessandro Bellina <abell...@yahoo-inc.com>
Date:   2016-09-19T18:33:37Z

    STORM-2101: fixes npe in compute-executors in nimbus

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