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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-44344] legacy map reduce fails to recreate indexes in existing output collection with two phase index builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-44344</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When given an output collection that already exists, the map reduce command will copy the indexes from the original output collection. With two phase index builds, the information in the &lt;tt&gt;startIndexBuild&lt;/tt&gt; and &lt;tt&gt;commitIndexBuild&lt;/tt&gt; oplog entries may contain indexes that already exist in the temporary collection used by map reduce. This may result in secondaries silently ignoring the two phase index build commands due to the &lt;tt&gt;IndexAlreadyExists&lt;/tt&gt; error.&lt;/p&gt;</description>
                <environment></environment>
        <key id="986712">SERVER-44344</key>
            <summary>legacy map reduce fails to recreate indexes in existing output collection with two phase index builds</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                    </labels>
                <created>Thu, 31 Oct 2019 19:37:45 +0000</created>
                <updated>Sun, 29 Oct 2023 22:15:31 +0000</updated>
                            <resolved>Mon, 4 Nov 2019 16:40:50 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2515122" author="xgen-internal-githook" created="Sat, 2 Nov 2019 00:48:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;username&apos;: &apos;benety&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44344&quot; title=&quot;legacy map reduce fails to recreate indexes in existing output collection with two phase index builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44344&quot;&gt;&lt;del&gt;SERVER-44344&lt;/del&gt;&lt;/a&gt; map reduce filters existing indexes on temp collection prior to index creation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/293fe1ce7153e62ffcd59dee0dabf1f28c2ccbe1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/293fe1ce7153e62ffcd59dee0dabf1f28c2ccbe1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2515038" author="xgen-internal-githook" created="Fri, 1 Nov 2019 22:15:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;benety&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;name&apos;: &apos;Benety Goh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44344&quot; title=&quot;legacy map reduce fails to recreate indexes in existing output collection with two phase index builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44344&quot;&gt;&lt;del&gt;SERVER-44344&lt;/del&gt;&lt;/a&gt; add MapReduce unit test for preserving indexes in existing output collection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/21945fb7effa4d08b0d5c59119a9170cb099e484&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/21945fb7effa4d08b0d5c59119a9170cb099e484&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="943441">SERVER-43692</issuekey>
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