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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-30410] Make sure PlanExecutor is saved when leaving DocumentSourceCursor::loadBatch()</title>
                <link>https://jira.mongodb.org/browse/SERVER-30410</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;An exception can be thrown during a call to PlanExecutor::getNext() if the operation times out. When this happens, we can leave &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.10/src/mongo/db/pipeline/document_source_cursor.cpp#L66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DocumentSourceCursor::loadBatch()&lt;/a&gt; without saving state on the PlanExecutor. Normally this wouldn&apos;t be a problem, since the whole Pipeline is about to be destroyed and we will never use it again. However, now that we&apos;ve introduced tailable aggregation cursors as part of the work for change streams, it&apos;s possible that we will continue using the pipeline after timing out. (There is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.10/src/mongo/db/commands/getmore_cmd.cpp#L461&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;logic in the getMore command to ignore this particular error condition for tailable cursors&lt;/a&gt;)&lt;/p&gt;

&lt;p&gt;There are a couple approaches we could take to resolve this, two come to mind:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Change PlanExecutor to swallow this error if it&apos;s tailable, and just return EOF instead.&lt;/li&gt;
	&lt;li&gt;Change DocumentSourceCursor to extend it&apos;s ON_BLOCK_EXIT to make sure to save the state of the PlanExecutor.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="409744">SERVER-30410</key>
            <summary>Make sure PlanExecutor is saved when leaving DocumentSourceCursor::loadBatch()</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="13201">Fixed</resolution>
                                        <assignee username="charlie.swanson@mongodb.com">Charlie Swanson</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 28 Jul 2017 18:28:04 +0000</created>
                <updated>Mon, 30 Oct 2023 23:14:47 +0000</updated>
                            <resolved>Mon, 28 Aug 2017 15:26:50 +0000</resolved>
                                                    <fixVersion>3.5.13</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1658511" author="xgen-internal-githook" created="Mon, 28 Aug 2017 15:26:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;cswanson310&apos;, &apos;name&apos;: &apos;Charlie Swanson&apos;, &apos;email&apos;: &apos;charlie.swanson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30410&quot; title=&quot;Make sure PlanExecutor is saved when leaving DocumentSourceCursor::loadBatch()&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30410&quot;&gt;&lt;del&gt;SERVER-30410&lt;/del&gt;&lt;/a&gt; Ensure executor is saved after tailable cursor time out.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/55a85da4980f1967f88bbccbd43646ee89c6301f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/55a85da4980f1967f88bbccbd43646ee89c6301f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="409786">SERVER-30414</issuekey>
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