Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/3371
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GitHub user wenlong88 opened a pull request:
https://github.com/apache/flink/pull/3371
[FLINK-5836] Fix race condition between offer slot and submit task
The solution is the same as what till described in jira: activating the
slots when reserving them on `TaskExecutor` before
