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https://issues.apache.org/jira/browse/FLINK-4866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16212152#comment-16212152
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ASF GitHub Bot commented on FLINK-4866:
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Github user vim-wj closed the pull request at:
https://github.com/apache/flink/pull/4866
> Make Trigger.clear() Abstract to Enforce Implementation
> -------------------------------------------------------
>
> Key: FLINK-4866
> URL: https://issues.apache.org/jira/browse/FLINK-4866
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Reporter: Aljoscha Krettek
> Assignee: Jark Wu
> Fix For: 1.2.0
>
>
> If the method is not abstract implementors of custom triggers will not
> realise that it could be necessary and they will likely not clean up their
> state/timers properly.
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