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    <title>MongoDB Jira</title>
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    <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-33701] Change streams can send getMores without logical session ids</title>
                <link>https://jira.mongodb.org/browse/SERVER-33701</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running a change stream against a mongos will set up one or more tailable cursors on the shards, then continuously poll those cursors until there is an unconsumed result. This polling continues to happen in the background even between the client&apos;s getMores. As a result, the AsyncResultsMerger can schedule a request with a null operation context &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2999202e0ca0e2a911352acbc47643650e7cefb8/src/mongo/s/query/async_results_merger.cpp#L361&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. If this happens, the getMore will not include the logical session id, or possibly other information that is stored on the OperationContext.&lt;/p&gt;

&lt;p&gt;Because the OperationContext is not required to be non-null within scheduleRemoteCommand, there may be other scenarios in which we do not include the logical session id or other metadata.&lt;/p&gt;</description>
                <environment></environment>
        <key id="506598">SERVER-33701</key>
            <summary>Change streams can send getMores without logical session ids</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Mar 2018 19:52:51 +0000</created>
                <updated>Tue, 6 Dec 2022 03:36:24 +0000</updated>
                            <resolved>Fri, 6 Apr 2018 14:42:59 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1825083" author="asya" created="Tue, 6 Mar 2018 20:50:18 +0000"  >&lt;p&gt;I&apos;ll need to figure out if we&apos;re moving in a direction where all operations will always start in a session or not...&lt;/p&gt;</comment>
                            <comment id="1825026" author="charlie.swanson" created="Tue, 6 Mar 2018 20:12:14 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt; I&apos;m not confident any tests will start failing, but I think we certainly want to support change streams against sharded clusters inside a session. I think (but I&apos;m not sure) that&apos;s how we recommend using a change stream, and how drivers will do it.&lt;/p&gt;

&lt;p&gt;cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1824999" author="tess.avitabile" created="Tue, 6 Mar 2018 19:55:16 +0000"  >&lt;p&gt;This means that change streams on sharded clusters in sessions will not work after &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33367&quot; title=&quot;Enforce a cursor is iterated in a transaction/session iff it was created in that transaction/session&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33367&quot;&gt;&lt;del&gt;SERVER-33367&lt;/del&gt;&lt;/a&gt;. If we don&apos;t do this, we will need to create a work-around (e.g. only check for matching session IDs if the getMore or originating command had a txnNumber, since that is all the validation that is required for transactions).&lt;/p&gt;</comment>
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                <issuelinks>
                            <issuelinktype id="10010">
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                                        <issuelink>
            <issuekey id="519101">SERVER-34204</issuekey>
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