[
https://issues.apache.org/jira/browse/FLINK-18523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17154595#comment-17154595
]
Jark Wu commented on FLINK-18523:
---------------------------------
Hi [~aljoscha], I think idleness timeout can't solve this problem, because all
the partitions don't have any data, but the user want to advance watermark at
this case, e.g. advance at the pace of system time.
> Advance watermark if there is no data in all of the partitions after some time
> ------------------------------------------------------------------------------
>
> Key: FLINK-18523
> URL: https://issues.apache.org/jira/browse/FLINK-18523
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / API
> Affects Versions: 1.11.0
> Reporter: chen yong
> Priority: Major
>
> In the case of window calculations and eventTime scenarios, watermar cannot
> update because the source does not have data for some reason, and the last
> Windows cannot trigger the calculations.
> One parameter, table.exec.source. Idle -timeout, can only solve the problem
> of ignoring parallelism of watermark alignment that does not occur.But when
> there is no watermark in each parallel degree, you still cannot update the
> watermark.
> Is it possible to add a lock-timeout parameter (which should be larger than
> maxOutOfOrderness with default of "-1 ms") and if the watermark is not
> updated beyond this time (i.e., there is no data), then the current time is
> taken and sent downstream as the watermark.
>
> thanks!
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
