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https://issues.apache.org/jira/browse/FLINK-6118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17336782#comment-17336782
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Flink Jira Bot commented on FLINK-6118:
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This issue was labeled "stale-major" 7 ago and has not received any updates so
it is being deprioritized. If this ticket is actually Major, please raise the
priority and ask a committer to assign you the issue or revive the public
discussion.
> Chained operators forward watermark without checking
> ----------------------------------------------------
>
> Key: FLINK-6118
> URL: https://issues.apache.org/jira/browse/FLINK-6118
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Affects Versions: 1.1.4, 1.2.0, 1.3.0
> Reporter: Aljoscha Krettek
> Priority: Major
> Labels: stale-major
>
> For operators that read from the network we have checks in place that verify
> that the input watermark only moves forwards. If an operator is directly
> chained to an operator then any {{Output.emitWatermark()}} of the first
> operator directly invoke {{processWatermark()}} on the chained operator,
> meaning that there are no verification steps in-between.
> This only becomes visible when a non-keyed, chained operator (with, for
> example a {{ProcessFunction}}) is checking the current watermark. Only keyed
> operators can have timers and for those the watermark always comes form the
> network, i.e. it behaves correctly.
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