GitHub user abellina opened a pull request:

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

    We observed compute-executors can throw NPE while shutting down a topology 
    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.

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    This closes #1694
commit b0944100e339f6d28c6c7bb936bef8ebb1948d89
Author: Alessandro Bellina <>
Date:   2016-09-19T18:33:37Z

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


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