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Posted to issues@nifi.apache.org by "Yan Chen (JIRA)" <ji...@apache.org> on 2018/12/14 13:40:00 UTC

[jira] [Created] (NIFI-5896) ComsumeAMQP lose/unack messages under certain conditions

Yan Chen created NIFI-5896:
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             Summary: ComsumeAMQP lose/unack messages under certain conditions
                 Key: NIFI-5896
                 URL: https://issues.apache.org/jira/browse/NIFI-5896
             Project: Apache NiFi
          Issue Type: Bug
    Affects Versions: 1.8.0
            Reporter: Yan Chen


Symptoms: when batch-size is larger than 1 (tested with 10 and 100), the processor would *occasionally*:

(1). when in auto-ack mode: lose messaged, i.e., messages consumed from server but without producing flowfiles;

(2). when auto-ack is disabled, messages could get stuck in "unacked" mode. 

We also found a work-around with batch-size 1 with auto-ack off; this work-around seems reliable enough.

Based on above symptoms and the work-around, it appears to be a race-condition related issue. (for the same reason, I could not provide a test-case to reliably recreate the symptom. 



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