Github user chermenin commented on the issue:
https://github.com/apache/flink/pull/2782
1) I researched this question a little. It based on issue
[FLINK-4631](https://issues.apache.org/jira/browse/FLINK-4631) and affect PR
#2709. So, it's more wide issue and all elements of streaming job must be
checked. I will add ticket soon.
2) In `FlumeSink` in other cases `client` already must be initialized.
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