Github user srdo commented on the issue:
https://github.com/apache/storm/pull/1417
@kishorvpatil Please take another look at this when you have time. There
was a potential NPE in the flushPending function because I forgot to check
server._cb for null before dereferencing. It should be fixed now. We run a
large number of tests using local clusters, and this fix seems to have made the
tests much more reliable.
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