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https://issues.apache.org/jira/browse/FLINK-4239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15391615#comment-15391615
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ASF GitHub Bot commented on FLINK-4239:
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Github user kl0u commented on the issue:
https://github.com/apache/flink/pull/2278
@uce I will do it today.
> Set Default Allowed Lateness to Zero and Make Triggers Non-Purging
> ------------------------------------------------------------------
>
> Key: FLINK-4239
> URL: https://issues.apache.org/jira/browse/FLINK-4239
> Project: Flink
> Issue Type: Sub-task
> Components: Streaming
> Affects Versions: 1.1.0
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
>
> In preparation for upcoming changes in 1.2 we should set the default allowed
> lateness to zero and make all built-in triggers non-purging by default.
> Currently, {{EventTimeTrigger}} and {{ProcessingTimeTrigger}} purge when they
> fire. This leads to unexpected behavior when a user sets some meaningful
> allowed lateness. The behavior will be that the window is purged when firing
> and the state will not actually be kept within the allowed lateness.
> Changing the behavior to non-purging requires changing the default allowed
> lateness from {{Long.MAX_VALUE}} to {{0}}. Otherwise we would have memory
> leaks.
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