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https://issues.apache.org/jira/browse/APEXMALHAR-2254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15543549#comment-15543549
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Matt Zhang commented on APEXMALHAR-2254:
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I'm interested in working on this.
Thanks,
Matt
> File input operator is not idempotent with closing files on replay
> ------------------------------------------------------------------
>
> Key: APEXMALHAR-2254
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2254
> Project: Apache Apex Malhar
> Issue Type: Bug
> Reporter: Pramod Immaneni
> Assignee: Pramod Immaneni
>
> With the file input operator, on a replay in a failure scenario, the same
> data is output as before the failure, for every window that is being replayed
> after checkpoint. To do this the operator keeps track of the files and
> offsets for every window and replays the data based on that.
> However, if it so happens that before the failure the processing of a file
> was finished and it was closed exactly before the end window and the next
> file was opened and processed in a new window, in the replay the closing of
> the first file does not happen in earlier window but happens in the latter
> window. This can cause problems if an operator depends on the closing file
> also to happen in an idempotent manner.
> Improve the operator to save the closing and opening of files in the
> idempotent state as well so that it can also happen in an idempotent manner.
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