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https://issues.apache.org/jira/browse/FLINK-4282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15416602#comment-15416602
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Renkai Ge commented on FLINK-4282:
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I have the same opinion with [~aljoscha],the offset property for TimeWindow is
redundant,the offset value should just effect the point which to devide the
stream into windows,not effect the window it self.If we want a window with
offset,we only need to change lines like
<https://github.com/apache/flink/blob/90cfe0a7b499832cebc2a53f7b066f83dde17de5/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/windowing/assigners/SlidingProcessingTimeWindows.java#L61>
,and since SessionWindows decide where to devide stream into windows by the
timestamp of first message comes,files like
ProcessingTimeSessionWindows.java,SlidingProcessingTimeWindows.java
and TumblingProcessingTimeWindows.java do not need to be changed for this issue.
> Add Offset Parameter to WindowAssigners
> ---------------------------------------
>
> Key: FLINK-4282
> URL: https://issues.apache.org/jira/browse/FLINK-4282
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Reporter: Aljoscha Krettek
>
> Currently, windows are always aligned to EPOCH, which basically means days
> are aligned with GMT. This is somewhat problematic for people living in
> different timezones.
> And offset parameter would allow to adapt the window assigner to the timezone.
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