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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-56590] Oplog truncation should correctly handle identical stones</title>
                <link>https://jira.mongodb.org/browse/SERVER-56590</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During startup, we randomly sample records in the oplog to generate oplog stones. It is possible to sample multiple identical records as oplog stone candidates during startup.&lt;/p&gt;

&lt;p&gt;This would normally be pretty hard, but if the size storer is very inaccurate, this may cause us to sample more records than necessary, increasing the probability of sampling the same record multiple times.&lt;/p&gt;

&lt;p&gt;If two identical oplog stones do exist, an oplog record may be truncated in one iteration. In a subsequent iteration, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1bdd251a274205c3af283696f443643894c209e3/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L1422-L1424&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;server may crash&lt;/a&gt; when it discovers that the last record in a stone ending in the same record does not exist.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1699883">SERVER-56590</key>
            <summary>Oplog truncation should correctly handle identical stones</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Mon, 3 May 2021 22:59:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:07 +0000</updated>
                            <resolved>Tue, 11 May 2021 17:04:00 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3767095" author="xgen-internal-githook" created="Tue, 11 May 2021 17:00:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56590&quot; title=&quot;Oplog truncation should correctly handle identical stones&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56590&quot;&gt;&lt;del&gt;SERVER-56590&lt;/del&gt;&lt;/a&gt; Oplog truncation should correctly handle overlapping stones&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/25aed16c97b02f7234e20f2284803f99a5fd9571&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/25aed16c97b02f7234e20f2284803f99a5fd9571&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1612717">SERVER-54301</issuekey>
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            <issuekey id="1490484">SERVER-51158</issuekey>
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