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https://issues.apache.org/jira/browse/APEXMALHAR-2419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15879182#comment-15879182
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Thomas Weise commented on APEXMALHAR-2419:
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Completed windows (endWindow) are supposed to be flushed to WAL, irrespective
of committed.
> KafkaSinglePortExactlyOnceOutputOperator fails on recovery
> ----------------------------------------------------------
>
> Key: APEXMALHAR-2419
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2419
> Project: Apache Apex Malhar
> Issue Type: Bug
> Reporter: Munagala V. Ramanath
> Assignee: Sandesh
>
> The KafkaSinglePortExactlyOnceOutputOperator fails on recovery with the
> message: "Violates Exactly once. Not all the tuples received after operator
> reset."
> This is because of this check in endWindow():
> {code}
> if (!partialWindowTuples.isEmpty() && windowId >
> windowDataManager.getLargestCompletedWindow()) {
> throw new RuntimeException("Violates Exactly once. Not all the tuples
> received after operator reset.");
> }
> {code}
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