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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-51107] Index build external sort files can collide with existing external sort files for resumed index builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-51107</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Say a resumable index build with external sort file extsort-index.0 is interrupted for shutdown during the collection scan or bulk load phases and then resumed on startup. The resumed index build will continue to use the same external sort file. However, now consider a new index build started while the resumed index build is still in progress. This new index build will attempt to also use an external sort file named extsort-index.0 due to the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd47e945b2f9d892be5f119adfa1937555e67c80/src/mongo/db/index/index_access_method.cpp#L846-L858&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;filename counter&lt;/a&gt; starting back at 0.&lt;/p&gt;

&lt;p&gt;Another scenario is if the resume info &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd47e945b2f9d892be5f119adfa1937555e67c80/src/mongo/db/storage/storage_engine_impl.cpp#L383-L388&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;failed to parse on startup&lt;/a&gt;, the external sort file extsort-index.0 will become orphaned until a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bd47e945b2f9d892be5f119adfa1937555e67c80/src/mongo/db/startup_recovery.cpp#L353-L365&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;subsequent restart&lt;/a&gt; without any index builds to resume (or an unclean shutdown). The external sort files can then collide in the same way as described above.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1485073">SERVER-51107</key>
            <summary>Index build external sort files can collide with existing external sort files for resumed 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="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Sep 2020 16:09:20 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:50 +0000</updated>
                            <resolved>Fri, 25 Sep 2020 14:39:45 +0000</resolved>
                                                    <fixVersion>4.8.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3411632" author="xgen-internal-githook" created="Fri, 25 Sep 2020 14:38:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51107&quot; title=&quot;Index build external sort files can collide with existing external sort files for resumed index builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51107&quot;&gt;&lt;del&gt;SERVER-51107&lt;/del&gt;&lt;/a&gt; Suffix index build external sort files with a random number generated at startup&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b5378e3b57fec7cca6ded55f4af07119c532edc9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b5378e3b57fec7cca6ded55f4af07119c532edc9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3407684" author="louis.williams" created="Wed, 23 Sep 2020 16:35:38 +0000"  >&lt;p&gt;We might be able to do something similar to what we do for idents already, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0e044981649f6712b3cc3f39bdb41c6e06546815/src/mongo/db/storage/durable_catalog_impl.cpp#L462&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;appending a random number generated at every startup&lt;/a&gt;, and also incrementing a counter.&lt;/p&gt;</comment>
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