Github user andralungu commented on the pull request:
https://github.com/apache/flink/pull/1058#issuecomment-135027923
excerpt from the JIRA
"This can be fixed by wrapping a concurrent list around the counts variable
e.g. CopyOnWriteArrayList from java.util.concurrrent (in the open method)"
Stood there open for a while so I thought I fixed it. Don't really know
what test should be written. The use case is the same, the environment just
goes from local to cluster.
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