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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-80427] Avoid change streams latency caused by lack of writes on a shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-80427</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a sharded cluster, to guarantee total ordering of events, change stream checks for events on all shards. This constrains latency of the events in change stream by the largest latency between writes on any individual shard. &lt;/p&gt;

&lt;p&gt;Default for periodicNoopIntervalSecs is 10s, so in the worst case when one of the shards doesn&apos;t receive any writes, the latency will be around that. &lt;/p&gt;</description>
                <environment></environment>
        <key id="2426792">SERVER-80427</key>
            <summary>Avoid change streams latency caused by lack of writes on a shard</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="kateryna.kamenieva@mongodb.com">Katya Kamenieva</reporter>
                        <labels>
                            <label>changestreams</label>
                            <label>query-product-urgency-2</label>
                            <label>query-product-value-1</label>
                            <label>sharding</label>
                    </labels>
                <created>Fri, 25 Aug 2023 15:00:50 +0000</created>
                <updated>Fri, 12 Jan 2024 23:26:07 +0000</updated>
                                                                                                <votes>4</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="5659477" author="kateryna.kamenieva" created="Fri, 25 Aug 2023 15:06:58 +0000"  >&lt;p&gt;One of the workarounds can be issuing artificial write traffic to all shards. E.g., create a job that inserts a small document with the required frequency, and remove them using TTL index.&lt;br/&gt;
Also, change stream listens for topology changes on the config server, and artificial writes have to be applied there too, e.g. by adding/removing shards to zone.&lt;/p&gt;</comment>
                            <comment id="5659460" author="kateryna.kamenieva" created="Fri, 25 Aug 2023 15:02:08 +0000"  >&lt;p&gt;It&apos;s possible to adjust periodicNoopIntervalSecs and set it as low as 1s, but it&apos;s still often not meeting the requirements of the practical use cases&lt;/p&gt;</comment>
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                                            <outwardlinks description="related to">
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            <issuekey id="419132">SERVER-30784</issuekey>
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            <issuekey id="868444">SERVER-42290</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="987168">SERVER-44356</issuekey>
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