Till Rohrmann created FLINK-5836:
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Summary: Race condition between slot offering and task deployment
Key: FLINK-5836
URL: https://issues.apache.org/jira/browse/FLINK-5836
Project: Flink
Issue Type: Bug
Components: Distributed Coordination
Affects Versions: 1.3.0
Reporter: Till Rohrmann
The Flip-6 code has a race condition when offering slots to a {{JobManager}}
which directly deploys tasks to the offered slots. In such a situation it is
possible that the deploy call overtakes the acknowledge message for the slot
offering. As a result, the slots are not marked yet as active and the
deployment will fail.
I propose to fix this problem by first activating all offered slots before
sending the slot offer message to the {{JobManager}}. Consequently, we'll
deactivate and free slots which haven't been accepted by the {{JobManager}}
once we've received the offering acknowledge message.
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