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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-83185] Close Windows on completely idle streams</title>
                <link>https://jira.mongodb.org/browse/SERVER-83185</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Today, completely idle streams do not advance the watermark, allowing windows to close. This behavior is preferred in systems that need deterministic results but can produce an edge case with streams that are at times, inactive and will not advance the event-watermarks used to close the windows. In these edge cases, it is possible for an event to be stuck in a window&lt;span class=&quot;error&quot;&gt;&amp;#91;15min&amp;#93;&lt;/span&gt; potentially for many minutes/hours/days before a new event is read from the source, which advances the watermark closing the window and producing the output.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;To help solve these edge cases, another option should be configurable, which looks at the wall clock time only when the source inputs are entirely inactive. It should also consider the window time duration as well, as the window should not be closed if its possible events could still be consumed that would advance the watermark time.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;ie - 15-minute window, with a sourceIdleness of 30 seconds, should only force the window to close on the windowEndTime + sourceidleness have been reached on the wall.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;By default, this configuration would not be used as it creates un-deterministic results.&#160; If the source cannot be connected to for some reason this property should have no effect &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/help_16.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2485866">SERVER-83185</key>
            <summary>Close Windows on completely idle streams</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="matthew.normyle@mongodb.com">Matthew Normyle</assignee>
                                    <reporter username="joe.niemiec@mongodb.com">Joe Niemiec</reporter>
                        <labels>
                            <label>init-337-m3</label>
                    </labels>
                <created>Mon, 30 Oct 2023 19:02:41 +0000</created>
                <updated>Tue, 5 Dec 2023 15:32:20 +0000</updated>
                            <resolved>Wed, 15 Nov 2023 19:20:34 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5875949" author="JIRAUSER1272160" created="Mon, 13 Nov 2023 16:31:19 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kenny.gorman%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;kenny.gorman@mongodb.com&quot;&gt;kenny.gorman@mongodb.com&lt;/a&gt; I&apos;m glad you bring window triggers up.. this feature is really a convenient mixture of Flink&apos;s out-of-the-box &quot;event time triggers&quot; and &quot;processing time triggers&quot;.&lt;/p&gt;

&lt;p&gt;Flink has support for lots of other triggers. We shouldn&apos;t try to take them on in this ticket-- but I hope we invest in other types of windows at some point.&lt;/p&gt;</comment>
                            <comment id="5846976" author="JIRAUSER1265643" created="Wed, 1 Nov 2023 17:44:34 +0000"  >&lt;p&gt;Should we implement window triggers so we have a generic mechanism? &#160;&lt;a href=&quot;https://nightlies.apache.org/flink/flink-docs-release-1.14/docs/dev/datastream/operators/windows/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://nightlies.apache.org/flink/flink-docs-release-1.14/docs/dev/datastream/operators/windows/&lt;/a&gt;&lt;/p&gt;</comment>
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