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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-4401] query optimizer cursor may return partial result set for a $or query if the last index match for a $or clause is deleted while it is &quot;current&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-4401</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is a concurrency issue where the cursor will finish instead of advancing from one $or clause to the next if a particular race condition occurs.  This currently affects distinct, group, map/reduce etc which rely on the query optimizer cursor.&lt;/p&gt;

&lt;p&gt;Test and fix are ready to go if you assign a version.&lt;/p&gt;</description>
                <environment></environment>
        <key id="25797">SERVER-4401</key>
            <summary>query optimizer cursor may return partial result set for a $or query if the last index match for a $or clause is deleted while it is &quot;current&quot;</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="9">Done</resolution>
                                        <assignee username="aaron">Aaron Staple</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 Dec 2011 05:57:50 +0000</created>
                <updated>Mon, 11 Jul 2016 18:34:39 +0000</updated>
                            <resolved>Sat, 24 Dec 2011 19:55:01 +0000</resolved>
                                                    <fixVersion>2.0.3</fixVersion>
                    <fixVersion>2.1.0</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="75860" author="auto" created="Sat, 24 Dec 2011 19:54:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;astaple&apos;, u&apos;name&apos;: u&apos;Aaron&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4401&quot; title=&quot;query optimizer cursor may return partial result set for a $or query if the last index match for a $or clause is deleted while it is &amp;quot;current&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4401&quot;&gt;&lt;del&gt;SERVER-4401&lt;/del&gt;&lt;/a&gt; attempt to advance to next or clause if a cursor becomes invalid on yield recovery&lt;br/&gt;
Branch: v2.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2d5c1aeeb470df3e79b1400a5410b73676d73c97&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2d5c1aeeb470df3e79b1400a5410b73676d73c97&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="72316" author="auto" created="Mon, 12 Dec 2011 03:30:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;astaple&apos;, u&apos;name&apos;: u&apos;Aaron&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4149&quot; title=&quot;reimplement update and delete using query optimizer cursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4149&quot;&gt;&lt;del&gt;SERVER-4149&lt;/del&gt;&lt;/a&gt; update checkLocation() to accommodate &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4401&quot; title=&quot;query optimizer cursor may return partial result set for a $or query if the last index match for a $or clause is deleted while it is &amp;quot;current&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4401&quot;&gt;&lt;del&gt;SERVER-4401&lt;/del&gt;&lt;/a&gt; changes to advance&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f4adf5f3d38ee85f764edf64d392fc96aeb94f4f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f4adf5f3d38ee85f764edf64d392fc96aeb94f4f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="70015" author="auto" created="Thu, 1 Dec 2011 06:39:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;astaple&apos;, u&apos;name&apos;: u&apos;Aaron&apos;, u&apos;email&apos;: u&apos;aaron@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4401&quot; title=&quot;query optimizer cursor may return partial result set for a $or query if the last index match for a $or clause is deleted while it is &amp;quot;current&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4401&quot;&gt;&lt;del&gt;SERVER-4401&lt;/del&gt;&lt;/a&gt; attempt to advance to next or clause if a cursor becomes invalid on yield recovery&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7288cf26686633d268c9f99fdabbb3f051c48077&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7288cf26686633d268c9f99fdabbb3f051c48077&lt;/a&gt;&lt;/p&gt;</comment>
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