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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4239) Set Default Allowed Lateness to Zero and Make Triggers Non-Purging
Date Mon, 25 Jul 2016 13:48:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15391915#comment-15391915
] 

ASF GitHub Bot commented on FLINK-4239:
---------------------------------------

Github user kl0u commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2278#discussion_r72065910
  
    --- Diff: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/windowing/triggers/PurgingTrigger.java
---
    @@ -93,13 +90,12 @@ public boolean canMerge() {
     	@Override
     	public TriggerResult onMerge(W window, OnMergeContext ctx) throws Exception {
     		TriggerResult triggerResult = nestedTrigger.onMerge(window, ctx);
    -		switch (triggerResult) {
    -			case FIRE:
    -				return TriggerResult.FIRE_AND_PURGE;
    -			case FIRE_AND_PURGE:
    -				return TriggerResult.FIRE_AND_PURGE;
    -			default:
    -				return TriggerResult.CONTINUE;
    +		if (triggerResult.isFire()) {
    +			return TriggerResult.FIRE_AND_PURGE;
    +		} else if (triggerResult.isPurge()) {
    +			return TriggerResult.PURGE;
    +		} else {
    +			return TriggerResult.CONTINUE;
     		}
     	}
     
    --- End diff --
    
    Same as above.


> 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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