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    <title>MongoDB Jira</title>
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    <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-86105] changeStreamCursor.hasNext() takes longer when returning false</title>
                <link>https://jira.mongodb.org/browse/SERVER-86105</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I am writing a no-passthough jstest opening and closing 960 change stream cursors with different options. The test starts and stops a minimalistic ShardingTest instance (1 mongos, 1 config-mongod, 1 shard-mongod) within the JavaScript file.&lt;/p&gt;

&lt;p&gt;I&apos;ve noticed that changeStreamCursor.hasNext() takes considerably longer (3 to 10 times) when the result is &apos;false&apos; (no change events to return).&lt;/p&gt;

&lt;p&gt;I have no idea if there is some intended waiting in mongo (legacy) shell, or if it is even a problem in the server&apos;s getMore command implementation.&lt;/p&gt;

&lt;p&gt;For reference, mongosh offers two functions: cursor.hasNext() and cursor.tryNext() and from the docs one can infer that cursor.hasNext() is &apos;blocking&apos;, so it might include some waiting (and a timeout?). mongo (legacy) shell does not have cursor.tryNext() counterpart.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2564699">SERVER-86105</key>
            <summary>changeStreamCursor.hasNext() takes longer when returning false</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="12452" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Needs Scheduling</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="romans.kasperovics@mongodb.com">Romans Kasperovics</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Feb 2024 01:03:06 +0000</created>
                <updated>Tue, 6 Feb 2024 19:55:58 +0000</updated>
                                            <version>6.0.13</version>
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