[jira] [Created] (NIFI-2384) Back-pressure should use cycle detection to avoid dead lock conditions

["Joseph Witt (JIRA)" <ji...@apache.org>]

Joseph Witt created NIFI-2384:
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             Summary: Back-pressure should use cycle detection to avoid dead lock conditions
                 Key: NIFI-2384
                 URL: https://issues.apache.org/jira/browse/NIFI-2384
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Core Framework
    Affects Versions: 1.0.0
            Reporter: Joseph Witt


If you have a cycle with back pressure being fed by a source with back pressure and the source of data is fast enough you can end up in a dead lock situation.

We should have cycle detection occur and then in the presence of a cycle which has backpressure on the source edge (back pressure on source edge and back pressure on all edges in the cycle) then we should ignore the backpressure on the destination edge and pull data from the back pressured cycle source edge.

Attached is a template which can replicate this condition.  Look on the bottom left cycle.



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