Mark Payne created NIFI-12228:
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Summary: Concurrency bug can occasionally lead to allowing a group
with Single FlowFile per Node input pulling in multiple FlowFiles
Key: NIFI-12228
URL: https://issues.apache.org/jira/browse/NIFI-12228
Project: Apache NiFi
Issue Type: Bug
Reporter: Mark Payne
Assignee: Mark Payne
Fix For: 1.latest, 2.latest
Every now and then we see a failure in the system tests:
{code:java}
BatchFlowBetweenGroupsIT.testSingleConcurrencyAndBatchOutputToBatchInputOutput
ยป Timeout testSingleConcurrencyAndBatchOutputToBatchInputOutput() timed out
after 5 minutes {code}
Looking at the logs shows that this is happening because data enters Group A,
and then before the Output Port has a chance to push the data out of Group A, a
second FlowFile enters. As a result, the test fails because the queue between
Groups A and B, or the connection inside of Group B, never reach the expected
size.
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